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Cheap flights from Belfast to Seattle from £409

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
27 Jan — 3 Feb1
1 adult

Cheap flight deals from Belfast to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Belfast (BF1) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 22 January 2025.

Round-trip from

£409

Popular in

July

Cheapest in

February

Average price

£778
3/3-10/3
  • 3/3-10/3
  • 4 total stops
  • 40h 05m total
  • Belfast to Seattle
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Highest demand for flights based on searches. 16% potential increase in price (£112 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£16 potential savings vs. average return price).
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Average for round-trip flights in January 2025
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Find flight deals from Belfast to Seattle

Cheapest flights from Belfast to Seattle
Explore the most affordable flight options available from Belfast to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 January 2025.

Fri 14/306:45BHD - SEA
1 stop12h 35mBritish Airways
Sun 23/319:50SEA - BHD
1 stop15h 50mBritish Airways
Deal found 21/1£474
Mon 3/206:30BHD - SEA
1 stop13h 16mDelta
Mon 10/206:15SEA - BHD
2 stops26h 35mDelta
Deal found 21/1£512
Sat 15/206:30BHD - SEA
1 stop13h 16mKLM
Mon 17/214:09SEA - BHD
1 stop18h 41mKLM
Deal found 20/1£517
Fri 14/306:00BFS - SEA
2 stops19h 00mMultiple Airlines
Sun 23/315:35SEA - BFS
2 stops22h 00mMultiple Airlines
Deal found 21/1£530
Thu 8/516:20BHD - SEA
1 stop27h 15mAmerican Airlines
Thu 29/517:40SEA - BHD
2 stops16h 25mAmerican Airlines
Deal found 20/1£589
Thu 8/516:20BHD - SEA
2 stops34h 29mFinnair
Thu 17/713:30SEA - BHD
1 stop13h 40mFinnair
Deal found 21/1£592
Fri 9/506:30BHD - SEA
1 stop13h 10mMultiple Airlines
Fri 30/517:35SEA - BHD
1 stop15h 20mMultiple Airlines
Deal found 20/1£615
Thu 8/509:35BHD - SEA
1 stop34h 00mIberia
Sun 20/715:12SEA - BHD
2 stops18h 33mIberia
Deal found 20/1£647

Find flights from Belfast to Seattle within your budget

Customise your flight search to find flights from Belfast 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 22 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 14/3

06:45-12:20

1 stop12h 35m

Seattle/Tacoma Intl

Sun 23/3

19:50-18:40

1 stop15h 50m

£474

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/2

06:30-11:46

1 stop13h 16m

Seattle/Tacoma Intl

Mon 10/2

06:15-16:50

2 stops26h 35m

£512

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 15/2

06:30-11:46

1 stop13h 16m

Seattle/Tacoma Intl

Mon 17/2

14:09-16:50

1 stop18h 41m

£517

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 14/3

06:00-18:00

2 stops19h 00m

Seattle/Tacoma Intl

Sun 23/3

15:35-20:35

2 stops22h 00m

£530

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

16:20-11:35

1 stop27h 15m

Seattle/Tacoma Intl

Thu 29/5

17:40-18:05

2 stops16h 25m

£589

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

16:20-18:49

2 stops34h 29m

Seattle/Tacoma Intl

Thu 17/7

13:30-11:10

1 stop13h 40m

£592

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 9/5

06:30-11:40

1 stop13h 10m

Seattle/Tacoma Intl

Fri 30/5

17:35-16:55

1 stop15h 20m

£615

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

09:35-11:35

1 stop34h 00m

Seattle/Tacoma Intl

Sat 19/7

10:10-10:10

2 stops16h 00m

£647

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 17/2

06:35-16:55

1 stop18h 20m

£516

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/2

17:20-11:46

1 stop26h 26m

£7,702

Flights are sorted by cheapest return flights first.

Deals found on 20/1

Showing 1-10 of 11 results
1
2

Best time to book a flight from Belfast to Seattle

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

Travel insights for flights from Belfast to Seattle

Get recent, data-driven insights about flights from Belfast to Seattle including ideal travel times, pricing trends, and more.

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

Find hourly flight availability from Belfast 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 22 January 2025.

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

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 22 January 2025.
Peruse reviews from past customers who have flown with Delta, KLM and American Airlines from Belfast to Seattle to help guide your decision. 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
8,521 reviews
Check prices

Entertainment

7.9

Comfort

8.0

Food

7.3

Boarding

8.2

Crew

8.6

Overall

8.0

Reviews

1 / 10

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

Delta
8.0
Very Good
8,521 reviews
Delta
8.0
Very Good
8,521 reviews
Check prices

Entertainment

7.9

Comfort

8.0

Food

7.3

Boarding

8.2

Crew

8.6

Overall

8.0

Reviews

1 / 10

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

KLM
7.8
Good
1,341 reviews
Delta
8.0
Very Good
8,521 reviews
Check prices

Entertainment

7.9

Comfort

8.0

Food

7.3

Boarding

8.2

Crew

8.6

Overall

8.0

Reviews

1 / 10

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

Finnair
7.6
Good
1,286 reviews
Delta
8.0
Very Good
8,521 reviews
Check prices

Entertainment

7.9

Comfort

8.0

Food

7.3

Boarding

8.2

Crew

8.6

Overall

8.0

Reviews

1 / 10

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

Virgin Atlantic
7.5
Good
665 reviews
Delta
8.0
Very Good
8,521 reviews
Check prices

Entertainment

7.9

Comfort

8.0

Food

7.3

Boarding

8.2

Crew

8.6

Overall

8.0

Reviews

1 / 10

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

American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very Good
8,521 reviews
Check prices

Entertainment

7.9

Comfort

8.0

Food

7.3

Boarding

8.2

Crew

8.6

Overall

8.0

Reviews

1 / 10

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 Belfast 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 Belfast?

    Most people fly into Seattle/Tacoma Intl (SEA) if they book a flight to Seattle from Belfast. On average, Seattle/Tacoma Intl has 0 inbound flights from Belfast per day from 1 airline. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

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

    British Airways, at £474, was found to be the cheapest airline from Belfast to Seattle.Alternate airlines flying return to your destination include Delta and KLM. British Airways is priced at 33% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

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

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

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

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Alternative routes for Belfast to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Belfast Intl to Seattle flights
Belfast City to Seattle flights

Top airline flying from Belfast to Seattle

Discover the top airline that operate flights from Belfast 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 22 January 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£482Average£586FlexibilityNo cancel feeOn-time70%
Search British Airways 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 Belfast to Seattle?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Belfast to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Belfast 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 Belfast to Seattle with no change fees?

Certainly. Search results for flights to Seattle from Belfast 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 Belfast to Seattle become cheaper?

Yes, Cheapflights offers price alerts on Belfast 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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