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Cheap flights from Belfast to Seattle from £332

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 13/11. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
22 Nov — 29 Nov1
1 adult
1 adult, Economy

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 23 October 2025.

Round-trip from

£640

One-way from

£332
American Airlines
  • American Airlines
  • 10/11-25/11
  • 2 total stops
  • 45h 55m total
  • Belfast to Seattle
Search Deals
13/11
  • 13/11
  • 3 total stops
  • 38h 13m total
  • Belfast to Seattle
Search Deals

Find flight deals from Belfast to Seattle

Enter your travel dates to find the best prices.

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 23 October 2025.

Tue 11/1106:00BFS - SEA
2 stops43h 00mMultiple Airlines
Thu 20/1114:35SEA - BFS
2 stops23h 00mMultiple Airlines
Deal found 22/10£538
Mon 10/1111:30BHD - SEA
1 stop32h 00mAmerican Airlines
Tue 25/1118:50SEA - BHD
1 stop13h 55mAmerican Airlines
Deal found 22/10£640
Wed 12/1109:15BHD - SEA
1 stop15h 40mBritish Airways
Tue 25/1118:50SEA - BHD
1 stop15h 50mBritish Airways
Deal found 22/10£643
Mon 10/1106:35BHD - SEA
2 stops24h 43mAmerican Airlines
Wed 19/1110:05SEA - BHD
2 stops20h 10mAmerican Airlines
Deal found 22/10£645
Mon 10/1114:40BHD - SEA
1 stop28h 50mBritish Airways
Wed 26/1118:50SEA - BHD
1 stop31h 30mBritish Airways
Deal found 22/10£649
Mon 10/1119:25BHD - SEA
1 stop24h 05mBritish Airways
Wed 19/1118:50SEA - BHD
1 stop28h 40mBritish Airways
Deal found 22/10£658
Wed 12/1112:25BHD - SEA
2 stops18h 53mBritish Airways
Wed 19/1118:50SEA - BHD
1 stop28h 40mBritish Airways
Deal found 22/10£661
Sat 8/1106:35BHD - SEA
1 stop12h 55mAmerican Airlines
Mon 24/1108:39SEA - BHD
2 stops21h 36mAmerican Airlines
Deal found 22/10£670
Fri 7/1119:35BHD - SEA
1 stop23h 55mBritish Airways
Mon 24/1111:42SEA - BHD
2 stops18h 33mBritish Airways
Deal found 22/10£673
Sat 8/1111:35BHD - SEA
2 stops19h 43mAmerican Airlines
Wed 19/1110:05SEA - BHD
2 stops20h 10mAmerican Airlines
Deal found 22/10£675
Mon 10/1106:35BHD - SEA
2 stops24h 43mBritish Airways
Sat 22/1118:50SEA - BHD
1 stop16h 50mBritish Airways
Deal found 22/10£676
Sun 9/1105:45BFS - SEA
2 stops40h 35mMultiple Airlines
Sun 23/1116:48SEA - BFS
1 stop21h 07mMultiple Airlines
Deal found 22/10£763

Cheapflights Fare Finder

 
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 23 October 2025.
Use the filters below to find and compare flights from Belfast to Seattle that are best for you.

Fly from

Belfast

Fly to

Seattle

Route

Depart

Return

Price

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 11/11

06:00-16:50

1 stop18h 50m

Seattle/Tacoma Intl

Thu 20/11

16:48-21:35

1 stop20h 47m

£616

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 12/11

12:25-16:55

1 stop12h 30m

Seattle/Tacoma Intl

Mon 17/11

11:42-14:15

2 stops18h 33m

£643

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 12/11

11:25-16:55

1 stop13h 30m

Seattle/Tacoma Intl

Mon 24/11

11:42-16:05

2 stops20h 23m

£643

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 12/11

09:15-16:55

1 stop15h 40m

Seattle/Tacoma Intl

Tue 18/11

09:00-14:50

2 stops21h 50m

£643

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 11/11

06:35-11:30

1 stop12h 55m

Seattle/Tacoma Intl

Wed 26/11

18:50-10:20

1 stop31h 30m

£649

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/3

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Mon 9/3

07:00-14:15

2 stops24h 15m

£654

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 10/11

06:35-23:18

2 stops24h 43m

Seattle/Tacoma Intl

Wed 26/11

18:50-10:20

1 stop31h 30m

£654

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 11/11

06:35-11:30

1 stop12h 55m

Seattle/Tacoma Intl

Wed 19/11

18:50-07:30

1 stop28h 40m

£658

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 12/11

12:25-16:55

1 stop12h 30m

Seattle/Tacoma Intl

Wed 19/11

18:50-07:30

1 stop28h 40m

£658

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 9/11

05:45-14:20

2 stops40h 35m

Seattle/Tacoma Intl

Sun 23/11

16:48-21:55

1 stop21h 07m

£763

Flights are sorted by cheapest return flights first.

Deals found on 22/10

Showing 1-10 of 35 results
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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.

Cheapflights Insights

Everything you need to know about your flight from Belfast to Seattle
No data available for this route at this time. Please check back soon.

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 23 October 2025.
Read through reviews of airlines operating flights from Belfast to Seattle, such as American Airlines and British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,028 reviews
Check prices

Comfort

7.2

Overall

7.2

Entertainment

6.9

Crew

8.0

Boarding

7.5

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Nordia,Sept 2025

KIN - MIA

We were to land in Miami sometime after 3pm but couldn’t due to bad weather, we flew around for 2 hrs until we had to land in Forth Myers to refuel, we had to sit another 2 hrs at Forth Myers until given the clearance to refuel, we were hungry, thirsty and frustrated at that point. All the had on the flight to offer was a small plastic glass of water and a pack of biscoff, I requested a cup of tea and was told none was there. We were basically at another airport and not one of the staff could consider that the passengers might be hungry or thirsty being on a plane for around 8 hrs, which you weren’t prepared for, at least find some hot water on board.
American Airlines
7.2
Good
11,028 reviews
American Airlines
7.2
Good
11,028 reviews
Check prices

Comfort

7.2

Overall

7.2

Entertainment

6.9

Crew

8.0

Boarding

7.5

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Nordia,Sept 2025

KIN - MIA

We were to land in Miami sometime after 3pm but couldn’t due to bad weather, we flew around for 2 hrs until we had to land in Forth Myers to refuel, we had to sit another 2 hrs at Forth Myers until given the clearance to refuel, we were hungry, thirsty and frustrated at that point. All the had on the flight to offer was a small plastic glass of water and a pack of biscoff, I requested a cup of tea and was told none was there. We were basically at another airport and not one of the staff could consider that the passengers might be hungry or thirsty being on a plane for around 8 hrs, which you weren’t prepared for, at least find some hot water on board.
British Airways
6.7
Okay
7,467 reviews
American Airlines
7.2
Good
11,028 reviews
Check prices

Comfort

7.2

Overall

7.2

Entertainment

6.9

Crew

8.0

Boarding

7.5

Food

6.4

Reviews

1 / 20
2.0
Mediocre

Nordia,Sept 2025

KIN - MIA

We were to land in Miami sometime after 3pm but couldn’t due to bad weather, we flew around for 2 hrs until we had to land in Forth Myers to refuel, we had to sit another 2 hrs at Forth Myers until given the clearance to refuel, we were hungry, thirsty and frustrated at that point. All the had on the flight to offer was a small plastic glass of water and a pack of biscoff, I requested a cup of tea and was told none was there. We were basically at another airport and not one of the staff could consider that the passengers might be hungry or thirsty being on a plane for around 8 hrs, which you weren’t prepared for, at least find some hot water on board.

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 2 airlines. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • How long is the flight from Belfast to Seattle?

    For as low as £643, British Airways can have you in Seattle from Belfast in 12h 30m. Airlines will cover a distance of 4472 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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.

See more FAQs

Travelling to a place near Seattle?

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

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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 2 airlines flying from Belfast to Seattle

Discover the top 2 airlines 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 23 October 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£441Average£520FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£562Average£562FlexibilityNo cancel feeOn-time71%
Search American Airlines 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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