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.

$927 Cheap Flights from Belfast Intl Airport to Seattle in 2026

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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.

6:25 pm - 6:00 pm

BFS

SEA

30h 35m

3 stops

3:40 pm - 3:55 pm

SEA

BFS

16h 15m

2 stops

$956Multiple Airlines

Wed, Mar 25 - Wed, Apr 1

9:05 pm - 6:00 pm

BFS

SEA

27h 55m

2 stops

3:40 pm - 3:20 pm

SEA

BFS

15h 40m

2 stops

$1,001Multiple Airlines

Wed, Mar 25 - Wed, Apr 1

6:25 pm - 6:00 pm

BFS

SEA

30h 35m

3 stops

7:00 pm - 11:10 pm

SEA

BFS

20h 10m

3 stops

$1,038Multiple Airlines

Wed, Mar 25 - Wed, Apr 1

8:55 am - 4:00 pm

BFS

SEA

39h 05m

3 stops

11:15 am - 6:55 pm

SEA

BFS

23h 40m

2 stops

$1,172Multiple Airlines

Mon, May 18 - Thu, May 28

8:15 am - 8:40 pm

BFS

SEA

20h 25m

2 stops

11:15 am - 6:55 pm

SEA

BFS

23h 40m

2 stops

$1,180Multiple Airlines

Mon, May 18 - Thu, May 28

8:55 am - 4:00 pm

BFS

SEA

39h 05m

3 stops

5:40 am - 6:55 pm

SEA

BFS

29h 15m

3 stops

$1,185Multiple Airlines

Mon, May 18 - Thu, May 28

8:05 am - 7:20 pm

BFS

SEA

18h 15m

2 stops

7:10 pm - 9:15 pm

SEA

BFS

18h 05m

2 stops

$1,493Multiple Airlines

Fri, Mar 27 - Fri, Apr 3

9:55 am - 8:45 pm

BFS

SEA

17h 50m

2 stops

5:40 am - 7:50 pm

SEA

BFS

30h 10m

3 stops

$1,519Multiple Airlines

Fri, Mar 27 - Fri, Apr 3

6:25 pm - 10:16 pm

BFS

SEA

34h 51m

3 stops

8:00 am - 4:55 pm

SEA

BFS

24h 55m

3 stops

$1,641Multiple Airlines

Thu, Mar 26 - Thu, Apr 2

6:25 pm - 10:16 pm

BFS

SEA

34h 51m

3 stops

2:10 pm - 9:40 pm

SEA

BFS

23h 30m

2 stops

$1,658Multiple Airlines

Thu, Mar 26 - Thu, Apr 2

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

Wed 3/25

6:25 pm-6:00 pm

3 stops30h 35m

Seattle/Tacoma Intl

Wed 4/1

3:40 pm-3:55 pm

2 stops16h 15m

$956

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 3/25

9:05 pm-6:00 pm

2 stops27h 55m

Seattle/Tacoma Intl

Wed 4/1

3:40 pm-3:20 pm

2 stops15h 40m

$1,001

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 3/25

6:25 pm-6:00 pm

3 stops30h 35m

Seattle/Tacoma Intl

Wed 4/1

7:00 pm-11:10 pm

3 stops20h 10m

$1,038

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 5/18

8:55 am-4:00 pm

3 stops39h 05m

Seattle/Tacoma Intl

Thu 5/28

11:15 am-6:55 pm

2 stops23h 40m

$1,172

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 5/18

8:15 am-8:40 pm

2 stops20h 25m

Seattle/Tacoma Intl

Thu 5/28

11:15 am-6:55 pm

2 stops23h 40m

$1,180

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 5/18

8:55 am-4:00 pm

3 stops39h 05m

Seattle/Tacoma Intl

Thu 5/28

5:40 am-6:55 pm

3 stops29h 15m

$1,185

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 3/27

8:05 am-7:20 pm

2 stops18h 15m

Seattle/Tacoma Intl

Fri 4/3

7:10 pm-9:15 pm

2 stops18h 05m

$1,493

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 3/27

9:55 am-8:45 pm

2 stops17h 50m

Seattle/Tacoma Intl

Fri 4/3

5:40 am-7:50 pm

3 stops30h 10m

$1,519

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 3/26

6:25 pm-10:16 pm

3 stops34h 51m

Seattle/Tacoma Intl

Thu 4/2

8:00 am-4:55 pm

3 stops24h 55m

$1,641

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 3/26

6:25 pm-10:16 pm

3 stops34h 51m

Seattle/Tacoma Intl

Thu 4/2

2:10 pm-9:40 pm

2 stops23h 30m

$1,658

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

Fastest flight time	12h 30m
Direct flights	None

The fastest flight from Belfast Intl Airport to Seattle takes 12h 30m

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?
The straight-line distance from Belfast Intl to Seattle/Tacoma Intl is 4452.2 mi. 12h 30m 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

Redmond

Puyallup

Cle Elum

Lakewood

Tukwila

Federal Way

Kirkland

Westport

Centralia

Fife

Tumwater

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.