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

Price Alerts will notify you by email when the price for flights to Seattle from Belfast Intl Airport decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

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

Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

How does momondo find its flight prices?

We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

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 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.

$443 Cheap Flights from Belfast Intl Airport to Seattle in 2025/26

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Find the cheapest flights from Belfast Intl Airport to Seattle

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 am - 5:00 pmBFS-SEA

43h 00m2 stops

2:35 pm - 9:35 pmSEA-BFS

23h 00m2 stops

$719Multiple Airlines

Find Deal

Tue, Nov 11 - Thu, Nov 20

6:00 am - 4:50 pmBFS-SEA

18h 50m1 stop

4:48 pm - 9:35 pmSEA-BFS

20h 47m1 stop

$822Multiple Airlines

Find Deal

Tue, Nov 11 - Thu, Nov 20

5:45 am - 2:20 pmBFS-SEA

40h 35m2 stops

4:48 pm - 9:55 pmSEA-BFS

21h 07m1 stop

$1,019Multiple Airlines

Find Deal

Sun, Nov 9 - Sun, Nov 23

10:00 am - 10:16 pmBFS-SEA

44h 16m3 stops

5:50 am - 7:25 pmSEA-BFS

29h 35m3 stops

$1,027Multiple Airlines

Find Deal

Fri, Dec 5 - Fri, Dec 12

6:00 am - 10:40 amBFS-SEA

36h 40m2 stops

4:48 pm - 6:20 pmSEA-BFS

17h 32m1 stop

$1,030Multiple Airlines

Find Deal

Wed, Nov 12 - Wed, Nov 19

6:00 am - 10:40 amBFS-SEA

36h 40m2 stops

4:48 pm - 3:55 pmSEA-BFS

15h 07m1 stop

$1,034Multiple Airlines

Find Deal

Wed, Nov 12 - Wed, Nov 26

6:00 am - 10:40 amBFS-SEA

36h 40m2 stops

7:20 pm - 8:15 pmSEA-BFS

16h 55m1 stop

$1,036Multiple Airlines

Find Deal

Wed, Nov 12 - Tue, Nov 25

6:00 am - 10:40 amBFS-SEA

36h 40m2 stops

4:48 pm - 4:15 pmSEA-BFS

15h 27m1 stop

$1,043Multiple Airlines

Find Deal

Wed, Nov 12 - Mon, Nov 24

10:00 am - 10:16 pmBFS-SEA

44h 16m3 stops

8:10 am - 1:50 pmSEA-BFS

21h 40m2 stops

$1,044Multiple Airlines

Find Deal

Fri, Dec 5 - Fri, Dec 12

8:55 pm - 10:40 amBFS-SEA

45h 45m2 stops

4:48 pm - 4:15 pmSEA-BFS

15h 27m1 stop

$1,048Multiple Airlines

Find Deal

Tue, Nov 11 - Mon, Nov 24

momondo Fare Finder

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

Tue 11/11

6:00 am-5:00 pm

2 stops43h 00m

Seattle/Tacoma Intl

Thu 11/20

2:35 pm-9:35 pm

2 stops23h 00m

$719

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 11/11

6:00 am-4:50 pm

1 stop18h 50m

Seattle/Tacoma Intl

Thu 11/20

4:48 pm-9:35 pm

1 stop20h 47m

$822

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 11/9

5:45 am-2:20 pm

2 stops40h 35m

Seattle/Tacoma Intl

Sun 11/23

4:48 pm-9:55 pm

1 stop21h 07m

$1,019

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 12/5

10:00 am-10:16 pm

3 stops44h 16m

Seattle/Tacoma Intl

Fri 12/12

5:50 am-7:25 pm

3 stops29h 35m

$1,027

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 11/12

6:00 am-10:40 am

2 stops36h 40m

Seattle/Tacoma Intl

Wed 11/19

4:48 pm-6:20 pm

1 stop17h 32m

$1,030

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 11/12

6:00 am-10:40 am

2 stops36h 40m

Seattle/Tacoma Intl

Wed 11/26

4:48 pm-3:55 pm

1 stop15h 07m

$1,034

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 11/12

6:00 am-10:40 am

2 stops36h 40m

Seattle/Tacoma Intl

Tue 11/25

7:20 pm-8:15 pm

1 stop16h 55m

$1,036

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 11/12

6:00 am-10:40 am

2 stops36h 40m

Seattle/Tacoma Intl

Mon 11/24

4:48 pm-4:15 pm

1 stop15h 27m

$1,043

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 12/5

10:00 am-10:16 pm

3 stops44h 16m

Seattle/Tacoma Intl

Fri 12/12

8:10 am-1:50 pm

2 stops21h 40m

$1,044

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 11/11

8:55 pm-10:40 am

2 stops45h 45m

Seattle/Tacoma Intl

Mon 11/24

4:48 pm-4:15 pm

1 stop15h 27m

$1,048

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted 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 round-trip 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.

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How far is Belfast Intl to Seattle/Tacoma Intl by plane?
The straight-line distance from Belfast Intl to Seattle/Tacoma Intl is 4452.2 mi. 17h 15m is a normal flight duration for this route.
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 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.

How do I get Price Alerts for flights from Belfast Intl Airport to Seattle?
Price Alerts will notify you by email when the price for flights to Seattle from Belfast Intl Airport decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.
How can I save money on flights from Belfast Intl Airport to Seattle with momondo?
Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.
How does momondo find its flight prices?
We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Tukwila

Lakewood

Federal Way

Kirkland

Fife

Redmond

Cle Elum

Centralia

Shoreline

Westport

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 helps you find the best flight between Belfast and Seattle by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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.