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Cheap flights from Belfast to Seattle from £413

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Belfast to Seattle departing on 7/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
07:00 - 16:00
BFS
-
SEA
17h 00m
2 stops
Multiple Airlines Logo
15:40 - 22:40
SEA
-
BFS
23h 00m
3 stops
£674Multiple Airlines
Sat, 11 Apr - Sat, 18 Apr
Multiple Airlines Logo
10:20 - 20:40
BHD
-
SEA
18h 20m
2 stops
Multiple Airlines Logo
17:40 - 09:20
SEA
-
BHD
31h 40m
1 stop
£736Multiple Airlines
Tue, 9 Jun - Sat, 20 Jun
Multiple Airlines Logo
06:20 - 16:00
BFS
-
SEA
17h 40m
2 stops
Multiple Airlines Logo
18:15 - 22:40
SEA
-
BFS
20h 25m
2 stops
£743Multiple Airlines
Sat, 11 Apr - Sat, 18 Apr
KLM Logo
17:30 - 11:15
BHD
-
SEA
25h 45m
2 stops
KLM Logo
09:30 - 09:20
SEA
-
BHD
15h 50m
2 stops
£773KLM
Tue, 7 Jul - Fri, 17 Jul
British Airways Logo
09:40 - 22:58
BHD
-
SEA
21h 18m
2 stops
British Airways Logo
13:35 - 18:10
SEA
-
BHD
20h 35m
1 stop
£780British Airways
Tue, 7 Jul - Fri, 17 Jul
Multiple Airlines Logo
09:50 - 11:37
BHD
-
SEA
33h 47m
1 stop
Multiple Airlines Logo
17:40 - 09:20
SEA
-
BHD
31h 40m
1 stop
£809Multiple Airlines
Tue, 9 Jun - Sat, 20 Jun
Multiple Airlines Logo
17:30 - 11:33
BHD
-
SEA
26h 03m
1 stop
Multiple Airlines Logo
17:40 - 09:20
SEA
-
BHD
31h 40m
1 stop
£846Multiple Airlines
Tue, 7 Jul - Fri, 17 Jul
Aer Lingus Logo
19:30 - 17:10
BHD
-
SEA
29h 40m
2 stops
Aer Lingus Logo
19:10 - 20:55
SEA
-
BHD
17h 45m
2 stops
£898Aer Lingus
Tue, 9 Jun - Sat, 20 Jun
Multiple Airlines Logo
10:35 - 21:53
BFS
-
SEA
43h 18m
3 stops
Multiple Airlines Logo
15:40 - 22:40
SEA
-
BFS
23h 00m
3 stops
£947Multiple Airlines
Sat, 11 Apr - Sat, 18 Apr

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets
British Airways
7 Jul
BHD09:40Belfast City
21h 18m
2 stops
SEA22:58Seattle/Tacoma Intl
17 Jul
SEA13:35Seattle/Tacoma Intl
20h 35m
1 stop
BHD18:10Belfast City
£780
British Airways
7 Mar
BHD06:35Belfast City
12h 55m
1 stop
SEA11:30Seattle/Tacoma Intl
9 Mar
SEA13:37Seattle/Tacoma Intl
17h 38m
2 stops
BHD14:15Belfast City
£832
British Airways
7 Mar
BHD06:35Belfast City
12h 55m
1 stop
SEA11:30Seattle/Tacoma Intl
9 Mar
SEA19:50Seattle/Tacoma Intl
15h 45m
1 stop
BHD18:35Belfast City
£832

momondo 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, momondo users made 279,928 searches. Data last updated 27 February 2026.
Use the filters below to find and compare flights from Belfast to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 11/4

07:00-16:00

2 stops17h 00m

Seattle/Tacoma Intl

Sat 18/4

15:40-22:40

3 stops23h 00m

£674

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 9/6

10:20-20:40

2 stops18h 20m

Seattle/Tacoma Intl

Sat 20/6

17:40-09:20

1 stop31h 40m

£736

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 11/4

06:20-16:00

2 stops17h 40m

Seattle/Tacoma Intl

Sat 18/4

18:15-22:40

2 stops20h 25m

£743

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 7/7

17:30-11:15

2 stops25h 45m

Seattle/Tacoma Intl

Fri 17/7

09:30-09:20

2 stops15h 50m

£773

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 7/7

09:40-22:58

2 stops21h 18m

Seattle/Tacoma Intl

Fri 17/7

13:35-18:10

1 stop20h 35m

£780

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 9/6

09:50-11:37

1 stop33h 47m

Seattle/Tacoma Intl

Sat 20/6

17:40-09:20

1 stop31h 40m

£809

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 7/7

17:30-11:33

1 stop26h 03m

Seattle/Tacoma Intl

Fri 17/7

17:40-09:20

1 stop31h 40m

£846

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 9/6

19:30-17:10

2 stops29h 40m

Seattle/Tacoma Intl

Sat 20/6

19:10-20:55

2 stops17h 45m

£898

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 11/4

10:35-21:53

3 stops43h 18m

Seattle/Tacoma Intl

Sat 18/4

15:40-22:40

3 stops23h 00m

£947

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 7/3

12:45-16:09

3 stops59h 24m

£413

Flights are sorted by cheapest return flights first.

Showing 1-10 of 18 resultsSorted by cheapest first
1
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See travel insights to Seattle from

How to get the cheapest flight ticket from Belfast to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Belfast to Seattle/Tacoma Intl?

British Airways is the most popular carrier operating from Belfast to Seattle/Tacoma Intl

Cheap Belfast to Seattle flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Belfast to Seattle

Fastest flight time

12h 45m

Direct flights

None
The fastest flight from Belfast to Seattle takes 12h 45m
There are no direct flights from Belfast to Seattle. There are no popular flight routes from Belfast to Seattle.
Search flight deals

  • How far is Belfast to Seattle/Tacoma Intl by plane?

    Seattle/Tacoma Intl is 4463.0 mi away from Belfast. By plane, this route typically takes 12h 45m.

  • When did momondo last update prices for flights from Belfast to Seattle/Tacoma Intl Airport?

    Prices for flights from Belfast to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Belfast to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Belfast to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Belfast to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Belfast to Seattle

Compare and see reviews for airlines that fly from Belfast to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom £557Free CancellationRating
7.1
11,367 reviews
Search American Airlines flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Fife
SeaTac
Tukwila

Why use momondo?

Why should I use momondo to find a flight deal from Belfast to Seattle?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Belfast to Seattle. momondo saves you time and could save you money on your trip.

Can I find flights from Belfast to Seattle with flexible booking policies on momondo?

momondo does allow users to show only those flights to Seattle from Belfast which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Belfast to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from Belfast. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Belfast to Seattle right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Seattle from Belfast. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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