Latest deals
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Belfast Intl Airport to Seattle from £332

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 Intl Airport to Seattle departing on 13/11. 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

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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
06:00 - 17:00BFS-SEA
43h 00m2 stops
Multiple Airlines Logo
14:35 - 21:35SEA-BFS
23h 00m2 stops
£539Multiple Airlines
Find Deal
tis, 11 nov - tors, 20 nov
Multiple Airlines Logo
06:00 - 16:50BFS-SEA
18h 50m1 stop
Multiple Airlines Logo
16:48 - 21:35SEA-BFS
20h 47m1 stop
£616Multiple Airlines
Find Deal
tis, 11 nov - tors, 20 nov
Multiple Airlines Logo
05:45 - 14:20BFS-SEA
40h 35m2 stops
Multiple Airlines Logo
16:48 - 21:55SEA-BFS
21h 07m1 stop
£764Multiple Airlines
Find Deal
sön, 9 nov - sön, 23 nov
Multiple Airlines Logo
06:00 - 10:40BFS-SEA
36h 40m2 stops
Multiple Airlines Logo
16:48 - 18:20SEA-BFS
17h 32m1 stop
£772Multiple Airlines
Find Deal
ons, 12 nov - ons, 19 nov
Multiple Airlines Logo
06:00 - 10:40BFS-SEA
36h 40m2 stops
Multiple Airlines Logo
16:48 - 15:55SEA-BFS
15h 07m1 stop
£775Multiple Airlines
Find Deal
ons, 12 nov - ons, 26 nov
Multiple Airlines Logo
06:00 - 10:40BFS-SEA
36h 40m2 stops
Multiple Airlines Logo
19:20 - 20:15SEA-BFS
16h 55m1 stop
£777Multiple Airlines
Find Deal
ons, 12 nov - tis, 25 nov
Multiple Airlines Logo
06:00 - 10:40BFS-SEA
36h 40m2 stops
Multiple Airlines Logo
16:48 - 16:15SEA-BFS
15h 27m1 stop
£782Multiple Airlines
Find Deal
ons, 12 nov - mån, 24 nov
Multiple Airlines Logo
20:55 - 10:40BFS-SEA
45h 45m2 stops
Multiple Airlines Logo
16:48 - 16:15SEA-BFS
15h 27m1 stop
£786Multiple Airlines
Find Deal
tis, 11 nov - mån, 24 nov
Multiple Airlines Logo
08:55 - 14:20BFS-SEA
37h 25m2 stops
Multiple Airlines Logo
16:48 - 18:20SEA-BFS
17h 32m1 stop
£794Multiple Airlines
Find Deal
sön, 9 nov - ons, 19 nov
Multiple Airlines Logo
08:55 - 14:20BFS-SEA
37h 25m2 stops
Multiple Airlines Logo
16:48 - 15:55SEA-BFS
15h 07m1 stop
£796Multiple Airlines
Find Deal
sön, 9 nov - ons, 26 nov

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 24 oktober 2025.
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

tis 11/11

06:00-17:00

2 stops43h 00m

Seattle/Tacoma Intl

tors 20/11

14:35-21:35

2 stops23h 00m

£539

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

tis 11/11

06:00-16:50

1 stop18h 50m

Seattle/Tacoma Intl

tors 20/11

16:48-21:35

1 stop20h 47m

£616

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

sön 9/11

05:45-14:20

2 stops40h 35m

Seattle/Tacoma Intl

sön 23/11

16:48-21:55

1 stop21h 07m

£764

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

ons 12/11

06:00-10:40

2 stops36h 40m

Seattle/Tacoma Intl

ons 19/11

16:48-18:20

1 stop17h 32m

£772

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

ons 12/11

06:00-10:40

2 stops36h 40m

Seattle/Tacoma Intl

ons 26/11

16:48-15:55

1 stop15h 07m

£775

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

ons 12/11

06:00-10:40

2 stops36h 40m

Seattle/Tacoma Intl

tis 25/11

19:20-20:15

1 stop16h 55m

£777

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

ons 12/11

06:00-10:40

2 stops36h 40m

Seattle/Tacoma Intl

mån 24/11

16:48-16:15

1 stop15h 27m

£782

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

tis 11/11

20:55-10:40

2 stops45h 45m

Seattle/Tacoma Intl

mån 24/11

16:48-16:15

1 stop15h 27m

£786

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

sön 9/11

08:55-14:20

2 stops37h 25m

Seattle/Tacoma Intl

ons 19/11

16:48-18:20

1 stop17h 32m

£794

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

sön 9/11

08:55-14:20

2 stops37h 25m

Seattle/Tacoma Intl

ons 26/11

16:48-15:55

1 stop15h 07m

£796

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

Direct flights

None
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 17h 15m, 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
British AirwaysPriceFrom £441Free CancellationRating
6.7
7,469 reviews
Search British Airways flights
American AirlinesPriceFrom £563Free CancellationRating
7.2
11,033 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
Renton
SeaTac

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.

An easier way to manage your Seattle trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
sön 23/11
sön 30/11
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States