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.

$721 Cheap Flights from Belfast Intl Airport to Seattle in 2025

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Find the cheapest flights from Belfast Intl Airport to Seattle

Round-trip

One-way

Last minute

Cheap round-trip flights

6:35 am - 8:40 pmBFS-SEA

22h 05m2 stops

7:00 pm - 11:10 pmSEA-BFS

20h 10m2 stops

$803

Find Deal

Thu, Sep 4 - Wed, Sep 10

8:30 am - 5:50 pmBFS-SEA

17h 20m2 stops

7:00 pm - 9:10 pmSEA-BFS

18h 10m2 stops

$909

Find Deal

Fri, Sep 12 - Fri, Sep 19

6:35 am - 10:15 amBFS-SEA

35h 40m2 stops

5:35 pm - 8:30 pmSEA-BFS

18h 55m1 stop

$922

Find Deal

Thu, Sep 4 - Wed, Sep 10

6:05 am - 10:16 pmBFS-SEA

24h 11m3 stops

3:45 pm - 10:35 pmSEA-BFS

22h 50m3 stops

$987

Find Deal

Fri, Sep 12 - Fri, Sep 19

8:25 am - 8:40 pmBFS-SEA

20h 15m2 stops

3:45 pm - 10:35 pmSEA-BFS

22h 50m3 stops

$1,221

Find Deal

Fri, Sep 12 - Fri, Sep 19

2:50 pm - 8:29 pmBFS-SEA

37h 39m2 stops

1:50 pm - 2:05 pmSEA-BFS

16h 15m2 stops

$1,449

Find Deal

Tue, Oct 14 - Thu, Oct 23

9:40 am - 8:40 pmBFS-SEA

19h 00m2 stops

4:00 pm - 11:00 pmSEA-BFS

23h 00m2 stops

$1,513

Find Deal

Sat, Aug 16 - Sun, Aug 24

8:20 am - 10:16 pmBFS-SEA

21h 56m3 stops

4:00 pm - 11:00 pmSEA-BFS

23h 00m2 stops

$1,572

Find Deal

Sat, Aug 16 - Sun, Aug 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

Thu 9/4

6:35 am-8:40 pm

2 stops22h 05m

Seattle/Tacoma Intl

Wed 9/10

7:00 pm-11:10 pm

2 stops20h 10m

$803

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 9/12

8:30 am-5:50 pm

2 stops17h 20m

Seattle/Tacoma Intl

Fri 9/19

7:00 pm-9:10 pm

2 stops18h 10m

$909

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 9/4

6:35 am-10:15 am

2 stops35h 40m

Seattle/Tacoma Intl

Wed 9/10

5:35 pm-8:30 pm

1 stop18h 55m

$922

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 9/12

6:05 am-10:16 pm

3 stops24h 11m

Seattle/Tacoma Intl

Fri 9/19

3:45 pm-10:35 pm

3 stops22h 50m

$987

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 9/12

8:25 am-8:40 pm

2 stops20h 15m

Seattle/Tacoma Intl

Fri 9/19

3:45 pm-10:35 pm

3 stops22h 50m

$1,221

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 10/14

2:50 pm-8:29 pm

2 stops37h 39m

Seattle/Tacoma Intl

Thu 10/23

1:50 pm-2:05 pm

2 stops16h 15m

$1,449

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 8/16

9:40 am-8:40 pm

2 stops19h 00m

Seattle/Tacoma Intl

Sun 8/24

4:00 pm-11:00 pm

2 stops23h 00m

$1,513

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 8/16

8:20 am-10:16 pm

3 stops21h 56m

Seattle/Tacoma Intl

Sun 8/24

4:00 pm-11:00 pm

2 stops23h 00m

$1,572

Flights are sorted by cheapest round-trip 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 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

Best Price Found	$803
Fastest flight time	17h 20m
Direct flights	None
Airports in Seattle	1 airport

The best flight deal from Belfast Intl Airport to Seattle found on momondo in the last 72 hours is $803

The fastest flight from Belfast Intl Airport to Seattle takes 17h 20m

There are no direct flights from Belfast Intl Airport to Seattle. Popular non-direct route for this connection is Belfast Intl Airport - Seattle/Tacoma Intl Airport.

There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

Search flight deals

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 20m 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.

Leavenworth

Tacoma

SeaTac

Ocean Shores

Olympia

Renton

Kent

Federal Way

Puyallup

Lynnwood

Marysville

Tukwila

Kirkland

Lakewood

Fife

Centralia

Cle Elum

Shoreline

Westport

Redmond

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.