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Cheap flights from Belfast to Seattle from £472

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 3/8. 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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Find the cheapest flights from Belfast to Seattle

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
06:40 - 20:40
BFS
-
SEA
22h 00m
2 stops
Multiple Airlines Logo
19:00 - 16:15
SEA
-
BFS
13h 15m
2 stops
£608Multiple Airlines
Mon, 20 Apr - Mon, 4 May
Multiple Airlines Logo
19:35 - 20:40
BFS
-
SEA
33h 05m
3 stops
Multiple Airlines Logo
15:40 - 16:15
SEA
-
BFS
16h 35m
2 stops
£616Multiple Airlines
Mon, 20 Apr - Mon, 4 May
KLM Logo
17:30 - 11:45
BHD
-
SEA
26h 15m
1 stop
KLM Logo
08:50 - 09:20
SEA
-
BHD
16h 30m
2 stops
£642KLM
Mon, 20 Apr - Mon, 4 May
Multiple Airlines Logo
19:35 - 17:55
BFS
-
SEA
30h 20m
3 stops
Multiple Airlines Logo
15:40 - 23:20
SEA
-
BFS
23h 40m
3 stops
£643Multiple Airlines
Mon, 20 Apr - Mon, 4 May
Multiple Airlines Logo
19:35 - 11:35
BHD
-
SEA
24h 00m
1 stop
Multiple Airlines Logo
13:35 - 19:25
SEA
-
BHD
21h 50m
1 stop
£645Multiple Airlines
Mon, 20 Apr - Mon, 4 May
British Airways Logo
11:35 - 00:30
BHD
-
SEA
20h 55m
2 stops
British Airways Logo
15:17 - 15:30
SEA
-
BHD
16h 13m
2 stops
£662British Airways
Mon, 20 Apr - Mon, 4 May
Multiple Airlines Logo
20:10 - 17:10
BFS
-
SEA
29h 00m
3 stops
Multiple Airlines Logo
19:00 - 19:40
SEA
-
BFS
16h 40m
2 stops
£669Multiple Airlines
Tue, 31 Mar - Tue, 7 Apr
British Airways Logo
06:35 - 11:30
BHD
-
SEA
12h 55m
1 stop
British Airways Logo
19:50 - 18:35
SEA
-
BHD
15h 45m
1 stop
£677British Airways
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
06:35 - 11:30
BHD
-
SEA
12h 55m
1 stop
British Airways Logo
19:50 - 18:35
SEA
-
BHD
15h 45m
1 stop
£679British Airways
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
06:35 - 23:04
BHD
-
SEA
24h 29m
2 stops
British Airways Logo
07:21 - 10:40
SEA
-
BHD
20h 19m
2 stops
£682British Airways
Sat, 7 Mar - Mon, 9 Mar

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets
British Airways
20 Apr
BHD11:35Belfast City
20h 55m
2 stops
SEA00:30Seattle/Tacoma Intl
4 May
SEA15:17Seattle/Tacoma Intl
16h 13m
2 stops
BHD15:30Belfast City
£662
British Airways
7 Mar
BHD06:35Belfast City
12h 55m
1 stop
SEA11:30Seattle/Tacoma Intl
9 Mar
SEA13:37Seattle/Tacoma Intl
21h 58m
2 stops
BHD18:35Belfast City
£677
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
£679

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 16 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

Mon 20/4

06:40-20:40

2 stops22h 00m

Seattle/Tacoma Intl

Mon 4/5

19:00-16:15

2 stops13h 15m

£608

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 20/4

19:35-20:40

3 stops33h 05m

Seattle/Tacoma Intl

Mon 4/5

15:40-16:15

2 stops16h 35m

£616

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 20/4

17:30-11:45

1 stop26h 15m

Seattle/Tacoma Intl

Mon 4/5

08:50-09:20

2 stops16h 30m

£642

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 20/4

19:35-17:55

3 stops30h 20m

Seattle/Tacoma Intl

Mon 4/5

15:40-23:20

3 stops23h 40m

£643

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 20/4

19:35-11:35

1 stop24h 00m

Seattle/Tacoma Intl

Mon 4/5

13:35-19:25

1 stop21h 50m

£645

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 20/4

11:35-00:30

2 stops20h 55m

Seattle/Tacoma Intl

Mon 4/5

15:17-15:30

2 stops16h 13m

£662

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 31/3

20:10-17:10

3 stops29h 00m

Seattle/Tacoma Intl

Tue 7/4

19:00-19:40

2 stops16h 40m

£669

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-11:30

1 stop12h 55m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£677

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-11:30

1 stop12h 55m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£679

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-23:04

2 stops24h 29m

Seattle/Tacoma Intl

Mon 9/3

07:21-10:40

2 stops20h 19m

£682

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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2

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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 55m

Direct flights

None
The fastest flight from Belfast to Seattle takes 12h 55m
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 55m.

  • 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 £551Free CancellationRating
7.2
11,294 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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