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Cheap flights from Belfast Intl Airport to Seattle from £701

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Belfast Intl Airport to Seattle departing on 25/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Belfast Intl Airport to Seattle

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
18:25 - 18:00
BFS
-
SEA
30h 35m
3 stops
Multiple Airlines Logo
15:40 - 15:55
SEA
-
BFS
16h 15m
2 stops
£701Multiple Airlines
Wed, 25 Mar - Wed, 1 Apr
Multiple Airlines Logo
21:05 - 18:00
BFS
-
SEA
27h 55m
2 stops
Multiple Airlines Logo
15:40 - 15:20
SEA
-
BFS
15h 40m
2 stops
£734Multiple Airlines
Wed, 25 Mar - Wed, 1 Apr
Multiple Airlines Logo
18:25 - 18:00
BFS
-
SEA
30h 35m
3 stops
Multiple Airlines Logo
19:00 - 23:10
SEA
-
BFS
20h 10m
3 stops
£761Multiple Airlines
Wed, 25 Mar - Wed, 1 Apr
Multiple Airlines Logo
08:55 - 16:00
BFS
-
SEA
39h 05m
3 stops
Multiple Airlines Logo
11:15 - 18:55
SEA
-
BFS
23h 40m
2 stops
£859Multiple Airlines
Mon, 18 May - Thu, 28 May
Multiple Airlines Logo
08:15 - 20:40
BFS
-
SEA
20h 25m
2 stops
Multiple Airlines Logo
11:15 - 18:55
SEA
-
BFS
23h 40m
2 stops
£865Multiple Airlines
Mon, 18 May - Thu, 28 May
Multiple Airlines Logo
08:55 - 16:00
BFS
-
SEA
39h 05m
3 stops
Multiple Airlines Logo
05:40 - 18:55
SEA
-
BFS
29h 15m
3 stops
£869Multiple Airlines
Mon, 18 May - Thu, 28 May
Multiple Airlines Logo
18:25 - 22:16
BFS
-
SEA
34h 51m
3 stops
Multiple Airlines Logo
08:00 - 16:55
SEA
-
BFS
24h 55m
3 stops
£1,203Multiple Airlines
Thu, 26 Mar - Thu, 2 Apr
Multiple Airlines Logo
18:25 - 22:16
BFS
-
SEA
34h 51m
3 stops
Multiple Airlines Logo
14:10 - 21:40
SEA
-
BFS
23h 30m
2 stops
£1,215Multiple Airlines
Thu, 26 Mar - Thu, 2 Apr
Multiple Airlines Logo
09:45 - 14:20
BFS
-
SEA
35h 35m
2 stops
Multiple Airlines Logo
14:10 - 21:40
SEA
-
BFS
23h 30m
2 stops
£1,239Multiple Airlines
Thu, 26 Mar - Thu, 2 Apr
Multiple Airlines Logo
10:05 - 16:30
BFS
-
SEA
14h 25m
1 stop
Multiple Airlines Logo
19:00 - 16:00
SEA
-
BFS
13h 00m
2 stops
£2,013Multiple Airlines
Mon, 18 May - Thu, 28 May

momondo Fare Finder

 
Customise your flight search to find flights from Belfast Intl Airport 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 10 February 2026.
Use the filters below to find and compare flights from Belfast Intl Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 25/3

18:25-18:00

3 stops30h 35m

Seattle/Tacoma Intl

Wed 1/4

15:40-15:55

2 stops16h 15m

£701

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 25/3

21:05-18:00

2 stops27h 55m

Seattle/Tacoma Intl

Wed 1/4

15:40-15:20

2 stops15h 40m

£734

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 25/3

18:25-18:00

3 stops30h 35m

Seattle/Tacoma Intl

Wed 1/4

19:00-23:10

3 stops20h 10m

£761

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 18/5

08:55-16:00

3 stops39h 05m

Seattle/Tacoma Intl

Thu 28/5

11:15-18:55

2 stops23h 40m

£859

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 18/5

08:15-20:40

2 stops20h 25m

Seattle/Tacoma Intl

Thu 28/5

11:15-18:55

2 stops23h 40m

£865

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 18/5

08:55-16:00

3 stops39h 05m

Seattle/Tacoma Intl

Thu 28/5

05:40-18:55

3 stops29h 15m

£869

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 26/3

18:25-22:16

3 stops34h 51m

Seattle/Tacoma Intl

Thu 2/4

08:00-16:55

3 stops24h 55m

£1,203

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 26/3

18:25-22:16

3 stops34h 51m

Seattle/Tacoma Intl

Thu 2/4

14:10-21:40

2 stops23h 30m

£1,215

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 26/3

09:45-14:20

2 stops35h 35m

Seattle/Tacoma Intl

Thu 2/4

14:10-21:40

2 stops23h 30m

£1,239

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 18/5

10:05-16:30

1 stop14h 25m

Seattle/Tacoma Intl

Thu 28/5

19:00-16:00

2 stops13h 00m

£2,013

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

When to book flights from Belfast Intl Airport to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Belfast Intl Airport to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Belfast Intl Airport to Seattle (BFS to SEA) flight deals and tips

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

Fastest flight time

12h 55m

Direct flights

None
The fastest flight from Belfast Intl Airport to Seattle takes 12h 55m
There are no direct flights from Belfast Intl Airport to Seattle. There are no popular flight routes from Belfast Intl Airport to Seattle.
Search flight deals

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

    Belfast Intl and Seattle/Tacoma Intl are 4452.2 mi apart from one another. Flights usually cover this in 12h 55m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Belfast Intl Airport to Seattle/Tacoma Intl Airport were last updated today.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Belfast Intl Airport to Seattle/Tacoma Intl Airport.

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

    The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Belfast Intl Airport to Seattle?

Best airlines flying from Belfast Intl Airport to Seattle

Compare and see reviews for airlines that fly from Belfast Intl Airport to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom £550Free CancellationRating
7.2
11,258 reviews
Search American Airlines flights

  • How do I get Price Alerts for flights from Belfast Intl Airport to Seattle?

    Confirm your travel details to search for the latest offers for flights from Belfast Intl Airport to Seattle. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Belfast Intl Airport to Seattle with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Fife
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Why use momondo?

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

Finding the right flight to Seattle from Belfast is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Seattle quick and easy, saving you time and money.

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

Yes. All flights to Seattle from Belfast on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Belfast to Seattle.

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

If you are not ready to book a flight from Belfast to Seattle now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seattle and let you know when they change.

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