Find flights
When to book
Airlines
FAQs

Cheap flights from Portsmouth to Seattle from £468

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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
29 Apr — 6 May1
1 adult

Cheap flight deals from Portsmouth to Seattle

Keep the following information in mind while searching for Portsmouth to Seattle flight deals. Data was last updated 24 April 2025.

Round-trip from

£646

One-way from

£468

Popular in

August

Cheapest in

January

Average price

£533
KLM
  • KLM
  • 3/6-10/6
  • 2 total stops
  • 45h 45m total
  • Portsmouth to Seattle
Search Deals
Aer Lingus
  • Aer Lingus
  • 7/9
  • 1 total stop
  • 29h 50m total
  • Portsmouth to Seattle
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£84 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 April 2025
Search Deals

Find flight deals from Portsmouth to Seattle

Cheapest flights from Portsmouth to Seattle
Explore the most affordable flight options available from Portsmouth to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 April 2025.

Thu 1/509:20SOU - SEA
2 stops19h 30mKLM
Mon 5/509:35SEA - SOU
2 stops15h 15mKLM
Deal found 24/4£603
Thu 1/509:20SOU - SEA
2 stops21h 05mDelta
Mon 5/507:10SEA - SOU
2 stops17h 40mDelta
Deal found 23/4£607
Tue 3/609:20SOU - SEA
2 stops21h 23mVirgin Atlantic
Tue 10/611:40SEA - SOU
2 stops21h 20mVirgin Atlantic
Deal found 23/4£653

Cheapflights Fare Finder

Customise your flight search to find flights from Portsmouth to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 24 April 2025.
Use the filters below to find and compare flights from Portsmouth to Seattle that are best for you.

Fly from

Portsmouth

Fly to

Seattle

Route

Depart

Return

Price

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 3/6

17:35-15:55

1 stop30h 20m

Seattle/Tacoma Intl

Tue 10/6

17:35-17:00

1 stop15h 25m

£646

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 3/6

09:20-15:55

1 stop14h 35m

Seattle/Tacoma Intl

Tue 10/6

13:55-17:00

1 stop19h 05m

£649

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Tue 3/6

09:20-22:43

2 stops21h 23m

Seattle/Tacoma Intl

Tue 10/6

11:40-17:00

2 stops21h 20m

£653

SouthamptonSeattle

SOU - SEA

SOUSEA

Southampton Eastleigh

Sun 7/9

20:00-17:50

1 stop29h 50m

£468

Flights are sorted by cheapest return flights first.

Deals found on 24/4

Best time to book a flight from Portsmouth to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Portsmouth 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 Portsmouth to Seattle

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

Currently, January is the cheapest month in which you can book a flight from Portsmouth to Seattle (average of £622). Flying from Portsmouth 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 P0R to SEA?

Find hourly flight availability from Portsmouth 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 24 April 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portsmouth to Seattle as you normally would.

Weekly flight availability from Portsmouth to Seattle

Explore weekly flight availability from Portsmouth to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 24 April 2025.

The most flights from P0R to SEA are scheduled on a Monday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (11 on average).

Rainfall in Seattle by month

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

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

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 24 April 2025.
Read through reviews of airlines operating flights from Portsmouth to Seattle, such as Delta, KLM and Virgin Atlantic. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,919 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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
7,919 reviews
Delta
8.0
Very Good
7,919 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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
1,333 reviews
Delta
8.0
Very Good
7,919 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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
Virgin Atlantic
7.4
Good
642 reviews
Delta
8.0
Very Good
7,919 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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
Aer Lingus
7.0
Good
1,068 reviews
Delta
8.0
Very Good
7,919 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Food

7.3

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

Find useful and relevant information for your journey from Portsmouth 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 Portsmouth?

    For a flight from Portsmouth to Seattle, you will be flying into Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city. Seattle/Tacoma Intl is the only Seattle airport and it handles 0 inbound flights from Portsmouth per day. 13 airlines have flights to Seattle/Tacoma Intl from Portsmouth on a regular basis.

  • What are the most reliable airlines from Portsmouth to Seattle?

    Before booking your flight to Seattle from Portsmouth, check out the most reliable airlines to get you to your destination on time: Singapore Airlines (94%), Aeromexico (92%), KLM( 91%).

  • What are the cheapest flights from Portsmouth to Seattle?

    Looking for the cheapest flight from Portsmouth to Seattle? While on average our users pay £1,370, our data indicates the cheapest price to be £471. The most popular route (Southampton Eastleigh - Seattle/Tacoma Intl), is priced around £603.

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

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

  • How can I find direct flights from Portsmouth to Seattle?

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

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

    Yes. Cheapflights offers flight deals from Portsmouth 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 Portsmouth to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Portsmouth to Seattle (average of £622). Flying from Portsmouth 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

Travelling to a place near Portsmouth?

Book flights to Portsmouth if you plan to visit one of these locations
Tacoma
Leavenworth
Bothell

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portsmouth to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Seattle flights
Gatwick to Seattle flights
London City to Seattle flights
Heathrow to Portland flights
Manchester to Seattle flights
Edinburgh to Seattle flights
Stansted to Seattle flights
Gatwick to Portland flights
Luton to Seattle flights
Bristol to Seattle flights
Southampton to Seattle flights
London City to Portland flights
Birmingham to Seattle flights
Manchester to Portland flights
Heathrow to Spokane flights
Stansted to Portland flights
Newcastle upon Tyne to Seattle flights
Luton to Portland flights
Leeds to Seattle flights
Edinburgh to Portland flights
Heathrow to Bellingham flights
Gatwick to Spokane flights
London City to Spokane flights
Birmingham to Spokane flights
Manchester to Spokane flights
Birmingham to Portland flights
Bristol to Portland flights
Heathrow to Pasco flights
Southend to Seattle flights
Leeds to Portland flights
Newquay to Seattle flights
Edinburgh to Pasco flights
Grimsby to Portland flights

Top 10 airlines flying from Portsmouth to Seattle

Discover the top 10 airlines that operate flights from Portsmouth to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 24 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£8Average£678FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£329Average£513FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£389Average£575FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£399Average£495FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£403Average£591FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£411Average£587FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£419Average£574FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£435Average£618FlexibilityNo cancel feeOn-time70%
Search British Airways flights
DeltaCheapest£449Average£622FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£455Average£571FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Seattle from Portsmouth today with Cheapflights!

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Portsmouth to Seattle for you. Better yet — we are completely free to use.

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

Yes, we can. To see specific flights from Portsmouth to Seattle with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Seattle from Portsmouth today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights