What are the cheapest airlines flying from London to Seattle round-trip?

Icelandair, at £459, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Scandinavian Airlines and Finnair. Icelandair is priced at 23% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from London to Seattle one-way?

£410 is the cheapest one-way deal found within the past few days, from Aer Lingus. You may also be able to find cheap deals on Icelandair and WestJet, with prices starting from £418 and £421, respectively.

What are the most popular routes from London to Seattle?

When deciding which route to take from London to Seattle consider London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl as they are the most popular.

What are the cheapest flights from London to Seattle?

On average you can expect to pay £1,888 for a flight from London to Seattle. The cheapest flight overall is £482 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £402.

What are the most reliable airlines from London to Seattle?

Consider Aeromexico (98%), Singapore Airlines (98%) or KLM (92%) when booking your flight. These represent the most reliable airlines when flying from London to Seattle.

What are the most popular airlines that fly from London to Seattle?

Before booking your flight from London to Seattle check out the most popular airlines for this route: Air Canada, Air France or Finnair.

What is the cheapest day to fly round-trip from London to Seattle?

Leaving on a Monday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 20% on the overall cost on flights from London to Seattle.

How far in advance should I book a flight from London to Seattle?

Travelers have found it’s best to book a flight 44 days in advance to save up to 37% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 44 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London to Seattle 1-2 weeks in advance for as low as £606, or £835 for flights within the next 24 hours.

What is the cheapest month to fly from London to Seattle?

Due to multiple factors, expect to potentially pay more when booking in August. For low rates, January can be a great choice for travel to Seattle. Flights to Seattle from London in January are about £597 on average during January, but can be found for as low as £339.

What airport do you fly into for flights to Seattle from London?

Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London. Booking flights from London to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 6 daily inbound flights from London from 12 different airlines.

Can I find deals for flights from London to Seattle that include hotel bookings?

Yes. In addition to deals on London to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from London to Seattle?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Seattle.

Can I find deals for business class flights from London to Seattle?

Yes. Cheapflights offers flight deals from London to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£410+ Flights from London to Seattle

Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or February, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from London to Seattle

Round-trip from	£459
One-way from	£410
Popular in	August
Cheapest in	January
Average price	£526
Good round-trip deal	£561 or less
Good one-way deal	£614 or less

Icelandair
2/6-16/6
2 total stops
44h 10m total
London to Seattle

Search Deals

Aer Lingus
21/4
1 total stop
15h 09m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 15% potential increase in price (£86 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).

Search Deals

Average for round-trip flights in March 2025

Search Deals

Price to beat on a round-trip flight from London (LON) to Seattle/Tacoma Intl.

Search Deals

Price to beat on a one-way flight from London (LON) to Seattle/Tacoma Intl.

Search Deals

Find flight deals from London to Seattle

Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 March 2025.

Mon 2/615:40LGW - SEA

1 stop13h 00mIcelandair

Mon 16/623:30SEA - LGW

1 stop31h 10mIcelandair

Deal found 26/3£459

Tue 6/509:25LHR - SEA

Nonstop9h 45mFinnair

Wed 21/517:40SEA - LHR

1 stop13h 30mFinnair

Deal found 27/3£463

Tue 20/511:25LHR - SEA

2 stops34h 35mUnited Airlines

Wed 2/711:11SEA - LHR

1 stop17h 09mUnited Airlines

Deal found 25/3£464

Mon 21/421:25LHR - SEA

1 stop28h 25mIcelandair

Sat 26/415:45SEA - LHR

1 stop20h 35mIcelandair

Deal found 26/3£465

Wed 30/406:00LHR - SEA

2 stops24h 43mSWISS

Wed 7/514:40SEA - LHR

2 stops20h 40mSWISS

Deal found 26/3£470

Mon 5/506:30LHR - SEA

1 stop17h 27mKLM

Wed 14/520:20SEA - LHR

Nonstop9h 55mKLM

Deal found 25/3£471

Mon 21/409:50LHR - SEA

Nonstop9h 45mMultiple Airlines

Mon 5/517:40SEA - LHR

1 stop13h 30mMultiple Airlines

Deal found 26/3£472

Wed 4/607:05STN - SEA

1 stop14h 45mMultiple Airlines

Mon 16/616:00SEA - STN

1 stop16h 15mMultiple Airlines

Deal found 26/3£475

Sat 13/906:30LHR - SEA

2 stops23h 58mLufthansa

Wed 24/908:00SEA - LHR

1 stop18h 40mLufthansa

Deal found 26/3£476

Wed 23/413:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Wed 30/417:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 26/3£478

Tue 29/419:20LCY - SEA

2 stops33h 55mMultiple Airlines

Sun 4/514:15SEA - LCY

2 stops38h 15mMultiple Airlines

Deal found 26/3£479

Tue 22/414:30LGW - SEA

2 stops31h 33mFinnair

Tue 29/422:05SEA - LGW

2 stops26h 05mFinnair

Deal found 26/3£482

Best flights from London to Seattle
Discover carefully curated flight deals from London to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 27 March 2025.

Mon 2/615:40LGW - SEA

1 stop13h 00mIcelandair

Mon 16/623:30SEA - LGW

1 stop31h 10mIcelandair

Deal found 26/3£459

Wed 21/506:40LHR - SEA

1 stop15h 10mScandinavian Airlines

Mon 2/616:00SEA - LHR

1 stop16h 00mScandinavian Airlines

Deal found 27/3£463

Tue 6/509:25LHR - SEA

Nonstop9h 45mFinnair

Wed 21/517:40SEA - LHR

1 stop13h 30mFinnair

Deal found 27/3£463

Tue 20/511:25LHR - SEA

2 stops34h 35mUnited Airlines

Wed 2/711:11SEA - LHR

1 stop17h 09mUnited Airlines

Deal found 25/3£464

Fri 25/406:30LHR - SEA

1 stop13h 55mLufthansa

Fri 2/512:55SEA - LHR

1 stop13h 45mLufthansa

Deal found 26/3£467

Wed 30/406:00LHR - SEA

2 stops24h 43mSWISS

Wed 7/514:40SEA - LHR

2 stops20h 40mSWISS

Deal found 26/3£470

Mon 5/506:30LHR - SEA

1 stop17h 27mKLM

Wed 14/520:20SEA - LHR

Nonstop9h 55mKLM

Deal found 25/3£471

Mon 21/409:50LHR - SEA

Nonstop9h 45mMultiple Airlines

Mon 5/517:40SEA - LHR

1 stop13h 30mMultiple Airlines

Deal found 26/3£472

Sat 26/409:30LHR - SEA

2 stops20h 11mAir Canada

Sat 3/507:05SEA - LHR

1 stop15h 25mAir Canada

Deal found 27/3£475

Wed 23/413:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Wed 30/417:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 26/3£478

Mon 21/406:20LHR - SEA

1 stop18h 39mBritish Airways

Mon 5/513:30SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 26/3£484

Mon 21/416:30LHR - SEA

Nonstop9h 50mAmerican Airlines

Mon 5/517:40SEA - LHR

1 stop13h 30mAmerican Airlines

Deal found 26/3£487

Direct flights from London to Seattle
Explore direct flight options from London to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 27 March 2025.

Wed 23/413:25LHR - SEA

Nonstop10h 20mVirgin Atlantic

Wed 30/417:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 26/3£478

Wed 10/909:50LHR - SEA

Nonstop9h 45mBritish Airways

Wed 24/920:20SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 27/3£484

Mon 21/413:25LHR - SEA

Nonstop10h 20mMultiple Airlines

Mon 5/520:20SEA - LHR

Nonstop9h 55mMultiple Airlines

Deal found 26/3£497

Mon 21/413:25LHR - SEA

Nonstop10h 20mDelta

Mon 5/517:35SEA - LHR

Nonstop9h 45mDelta

Deal found 26/3£507

Tue 26/816:30LHR - SEA

Nonstop9h 50mIberia

Thu 4/913:30SEA - LHR

Nonstop9h 20mIberia

Deal found 27/3£522

Wed 30/417:25LHR - SEA

Nonstop10h 20mKLM

Mon 30/620:25SEA - LHR

Nonstop9h 50mKLM

Deal found 26/3£544

Wed 14/509:50LHR - SEA

Nonstop9h 45mFinnair

Tue 27/520:20SEA - LHR

Nonstop9h 20mFinnair

Deal found 26/3£561

Mon 2/617:25LHR - SEA

Nonstop10h 20mAir France

Tue 17/620:25SEA - LHR

Nonstop9h 50mAir France

Deal found 27/3£576

Sat 17/509:50LHR - SEA

Nonstop9h 45mAmerican Airlines

Tue 3/613:30SEA - LHR

Nonstop9h 20mAmerican Airlines

Deal found 26/3£611

Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 27 March 2025 and is based on user searches.

Tue 1/409:30LHR - SEA

2 stops20h 11mAir Canada

Tue 8/405:45SEA - LHR

2 stops16h 45mAir Canada

Deal found 26/3£532

Tue 1/410:30LHR - SEA

1 stop16h 38mBritish Airways

Tue 8/413:30SEA - LHR

Nonstop9h 20mBritish Airways

Deal found 26/3£549

Wed 2/416:30LHR - SEA

Nonstop9h 50mAmerican Airlines

Wed 21/517:40SEA - LHR

1 stop13h 30mAmerican Airlines

Deal found 26/3£519

Thu 3/406:50LHR - SEA

2 stops20h 11mUnited Airlines

Fri 25/407:15SEA - LHR

1 stop16h 10mUnited Airlines

Deal found 26/3£554

Thu 3/408:40LHR - SEA

1 stop15h 20mDelta

Fri 25/420:20SEA - LHR

Nonstop9h 55mDelta

Deal found 27/3£626

Thu 3/406:30LHR - SEA

1 stop13h 15mKLM

Fri 25/420:20SEA - LHR

Nonstop9h 55mKLM

Deal found 26/3£628

Thu 3/408:30LHR - SEA

1 stop21h 11mMultiple Airlines

Sat 19/408:15SEA - LHR

1 stop14h 40mMultiple Airlines

Deal found 26/3£684

Thu 3/408:30LHR - SEA

1 stop18h 31mAustrian Airlines

Sun 20/408:15SEA - LHR

1 stop14h 40mAustrian Airlines

Deal found 26/3£688

Fri 4/409:20LCY - SEA

1 stop14h 40mKLM

Wed 23/418:10SEA - LCY

1 stop14h 30mKLM

Deal found 26/3£762

Sun 6/421:20LGW - SEA

2 stops29h 49mMultiple Airlines

Mon 28/419:00SEA - LGW

1 stop11h 35mMultiple Airlines

Deal found 26/3£659

Sun 6/418:30LHR - SEA

Nonstop10h 20mVirgin Atlantic

Mon 28/417:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 26/3£673

Sun 6/420:10LCY - SEA

2 stops26h 55mVirgin Atlantic

Mon 28/418:10SEA - LCY

1 stop17h 30mVirgin Atlantic

Deal found 26/3£700

One-way flights from London to Seattle
Search for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated 27 March 2025.

Mon 21/409:50LHR - SEA

1 stop15h 09mAer Lingus

Deal found 26/3£410

Sat 5/415:15STN - SEA

3 stops59h 54mMultiple Airlines

Deal found 26/3£411

Sun 6/407:40LTN - SEA

3 stops43h 29mMultiple Airlines

Deal found 27/3£411

Sat 26/421:05LGW - SEA

3 stops48h 20mMultiple Airlines

Deal found 26/3£412

Sun 8/621:25LHR - SEA

2 stops23h 33mMultiple Airlines

Deal found 27/3£415

Tue 17/615:40LGW - SEA

1 stop13h 00mIcelandair

Deal found 26/3£418

Tue 17/621:25LHR - SEA

1 stop22h 00mIcelandair

Deal found 26/3£420

Fri 19/914:10LHR - SEA

1 stop14h 19mWestJet

Deal found 27/3£421

Thu 3/417:40SEN - SEA

2 stops34h 05mMultiple Airlines

Deal found 27/3£425

Mon 7/710:35LGW - SEA

2 stops40h 03mWestJet

Deal found 27/3£439

Sat 6/917:30LHR - SEA

2 stops28h 20mScandinavian Airlines

Deal found 26/3£480

Tue 22/406:45LCY - SEA

1 stop18h 14mBritish Airways

Deal found 26/3£507

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Mon 2/6

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Mon 16/6

23:30-14:40

1 stop31h 10m

£459

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 6/5

09:25-11:10

Nonstop9h 45m

Seattle/Tacoma Intl

Wed 21/5

17:40-15:10

1 stop13h 30m

£463

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 20/5

11:25-14:00

2 stops34h 35m

Seattle/Tacoma Intl

Wed 2/7

11:11-12:20

1 stop17h 09m

£464

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

21:25-17:50

1 stop28h 25m

Seattle/Tacoma Intl

Sat 26/4

15:45-20:20

1 stop20h 35m

£465

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 30/4

06:00-22:43

2 stops24h 43m

Seattle/Tacoma Intl

Wed 7/5

14:40-19:20

2 stops20h 40m

£470

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 5/5

06:30-15:57

1 stop17h 27m

Seattle/Tacoma Intl

Wed 14/5

20:20-14:15

Nonstop9h 55m

£471

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

09:50-11:35

Nonstop9h 45m

Seattle/Tacoma Intl

Mon 5/5

17:40-15:10

1 stop13h 30m

£472

LondonSeattle

STN - SEA

STNSEA

London Stansted

Wed 4/6

07:05-13:50

1 stop14h 45m

Seattle/Tacoma Intl

Mon 16/6

16:00-16:15

1 stop16h 15m

£475

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 13/9

06:30-22:28

2 stops23h 58m

Seattle/Tacoma Intl

Wed 24/9

08:00-10:40

1 stop18h 40m

£476

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 23/4

13:25-15:45

Nonstop10h 20m

Seattle/Tacoma Intl

Wed 30/4

17:35-11:20

Nonstop9h 45m

£478

Flights are sorted by cheapest return flights first.

Deals found on 26/3

Showing 1-10 of 59 results

...

Best time to book a flight from London to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from London with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Seattle

How far ahead should I book a flight from London to Seattle?

Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from London to Seattle?

Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of £622). Flying from London to Seattle in July is currently the most expensive (average of £946). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LON to SEA?

Unlike in the morning, when flights are generally more expensive, you can save up to 22% on flights from London to Seattle by exploring options for tickets in the evening.

What is the cheapest day to fly from London to Seattle?

Travellers seeking maximum savings on their London to Seattle flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Seattle by month

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

Temperature in Seattle by month

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

Reviews of airlines servicing Seattle

Read through reviews of airlines operating flights from London to Seattle, such as Delta, KLM and Finnair. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,895 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very Good

7,895 reviews

Delta

8.0

Very Good

7,895 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM

7.8

Good

1,321 reviews

Delta

8.0

Very Good

7,895 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair

7.6

Good

1,267 reviews

Delta

8.0

Very Good

7,895 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Austrian Airlines

7.5

Good

769 reviews

Delta

8.0

Very Good

7,895 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

SWISS

7.5

Good

1,570 reviews

Delta

8.0

Very Good

7,895 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

What airport do you fly into for flights to Seattle from London?
Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London. Booking flights from London to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 6 daily inbound flights from London from 12 different airlines.
What are the cheapest airlines flying from London to Seattle round-trip?
Icelandair, at £459, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Scandinavian Airlines and Finnair. Icelandair is priced at 23% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from London to Seattle one-way?
£410 is the cheapest one-way deal found within the past few days, from Aer Lingus. You may also be able to find cheap deals on Icelandair and WestJet, with prices starting from £418 and £421, respectively.
What are the most popular routes from London to Seattle?
When deciding which route to take from London to Seattle consider London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl as they are the most popular.
What are the most reliable airlines from London to Seattle?
Consider Aeromexico (98%), Singapore Airlines (98%) or KLM (92%) when booking your flight. These represent the most reliable airlines when flying from London to Seattle.
What are the cheapest flights from London to Seattle?
On average you can expect to pay £1,888 for a flight from London to Seattle. The cheapest flight overall is £482 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £402.
Can I find deals for flights from London to Seattle that include hotel bookings?
Yes. In addition to deals on London to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from London to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Seattle.
Can I find deals for business class flights from London to Seattle?
Yes. Cheapflights offers flight deals from London to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London to Seattle?
Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of £622). Flying from London to Seattle in July is currently the most expensive (average of £946). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Tacoma

Leavenworth

Bothell

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from London to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Aer Lingus	Cheapest£8	Average£694	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Icelandair	Cheapest£338	Average£530	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£401	Average£594	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£411	Average£523	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£422	Average£649	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
KLM	Cheapest£423	Average£613	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Finnair	Cheapest£431	Average£595	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Delta	Cheapest£447	Average£640	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
British Airways	Cheapest£451	Average£590	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£470	Average£589	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights

Fly with Cheapflights

How does Cheapflights help users find flights from London to Seattle?

Cheapflights makes it easy to find London to Seattle flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from London to Seattle?

Millions of users choose and trust Cheapflights to book the best flight deals from London to Seattle for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from London to Seattle with no change fees?

Certainly. Search results for flights to Seattle from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from London to Seattle become cheaper?

Yes, Cheapflights offers price alerts on London to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from London to Seattle from £410

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/4. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or February, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from London to Seattle

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from London to Seattle

Cheapest flights from London to SeattleExplore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 March 2025.

Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 March 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to Seattle that are best for you.

Best time to book a flight from London to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from London with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London to Seattle

How far ahead should I book a flight from London to Seattle?

Use this chart to determine the optimal time to book a return flight from London to Seattle. Price data was last updated on 21 March 2025.

What is the cheapest month to book a flight from London to Seattle?

What is the cheapest time of day to fly from LON to SEA?

Find hourly flight availability from London to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 27 March 2025.

What is the cheapest day to fly from London to Seattle?

Use this chart to determine the cheapest time to fly return from London to Seattle. Price data was last updated on 16 December 2024.

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

Reviews of airlines servicing Seattle

Read through reviews of airlines operating flights from London to Seattle, such as Delta, KLM and Finnair. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from London to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to Seattle from London?

What are the cheapest airlines flying from London to Seattle round-trip?

What are the cheapest airlines to fly from London to Seattle one-way?

What are the most popular routes from London to Seattle?

What are the most reliable airlines from London to Seattle?

What are the cheapest flights from London to Seattle?

Can I find deals for flights from London to Seattle that include hotel bookings?

How can I find direct flights from London to Seattle?

Can I find deals for business class flights from London to Seattle?

What is the cheapest month to book a flight from London to Seattle?

Travelling to a place near London?

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Fly from London to Seattle on these airlines

Choose from the following airlines for your flight from London to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 27 March 2025.

Top 10 airlines flying from London to Seattle

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Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 March 2025.