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

Prices for flights from Belfast to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

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

As of January 2026, there are 2 operators available to choose from for flights from Belfast to Seattle/Tacoma Intl Airport.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Belfast to Seattle/Tacoma Intl Airport.

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

The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

£423 Cheap Flights from Belfast to Seattle in 2026

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Find the cheapest flights from Belfast to Seattle

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

06:35 - 11:30

BHD

SEA

12h 55m

1 stop

19:50 - 18:35

SEA

BHD

15h 45m

1 stop

£528British Airways

Sat, 7 Mar - Mon, 9 Mar

06:35 - 23:04

BHD

SEA

24h 29m

2 stops

19:50 - 18:35

SEA

BHD

15h 45m

1 stop

£532British Airways

Sat, 7 Mar - Mon, 9 Mar

06:35 - 23:04

BHD

SEA

24h 29m

2 stops

13:37 - 20:15

SEA

BHD

23h 38m

2 stops

£539British Airways

Sat, 7 Mar - Mon, 9 Mar

06:35 - 11:30

BHD

SEA

12h 55m

1 stop

19:50 - 18:35

SEA

BHD

15h 45m

1 stop

£653British Airways

Sat, 7 Mar - Mon, 9 Mar

06:35 - 23:04

BHD

SEA

24h 29m

2 stops

19:50 - 18:35

SEA

BHD

15h 45m

1 stop

£657British Airways

Sat, 7 Mar - Mon, 9 Mar

06:35 - 23:04

BHD

SEA

24h 29m

2 stops

13:37 - 18:35

SEA

BHD

21h 58m

2 stops

£668British Airways

Sat, 7 Mar - Mon, 9 Mar

06:30 - 22:16

BFS

SEA

22h 46m

2 stops

16:10 - 22:00

SEA

BFS

22h 50m

2 stops

£873Multiple Airlines

Fri, 13 Mar - Fri, 20 Mar

06:30 - 22:16

BFS

SEA

22h 46m

2 stops

08:00 - 15:10

SEA

BFS

24h 10m

3 stops

£889Multiple Airlines

Fri, 13 Mar - Fri, 20 Mar

14:30 - 16:40

BFS

SEA

33h 10m

3 stops

08:00 - 15:10

SEA

BFS

24h 10m

3 stops

£916Multiple Airlines

Fri, 13 Mar - Fri, 20 Mar

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets

British Airways

7 Mar

BHD06:35Belfast City

12h 55m

1 stop

SEA11:30Seattle/Tacoma Intl

9 Mar

SEA19:50Seattle/Tacoma Intl

15h 45m

1 stop

BHD18:35Belfast City

£528

British Airways

7 Mar

BHD06:35Belfast City

24h 29m

2 stops

SEA23:04Seattle/Tacoma Intl

9 Mar

SEA19:50Seattle/Tacoma Intl

15h 45m

1 stop

BHD18:35Belfast City

£532

British Airways

4 Feb

BHD06:35Belfast City

23h 32m

2 stops

SEA22:07Seattle/Tacoma Intl

8 Feb

SEA14:10Seattle/Tacoma Intl

36h 30m

2 stops

BHD10:40Belfast City

£536

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-11:30

1 stop12h 55m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£528

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-23:04

2 stops24h 29m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£532

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-23:04

2 stops24h 29m

Seattle/Tacoma Intl

Mon 9/3

13:37-20:15

2 stops23h 38m

£539

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-11:30

1 stop12h 55m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£653

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-23:04

2 stops24h 29m

Seattle/Tacoma Intl

Mon 9/3

19:50-18:35

1 stop15h 45m

£657

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-23:04

2 stops24h 29m

Seattle/Tacoma Intl

Mon 9/3

13:37-18:35

2 stops21h 58m

£668

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 13/3

06:30-22:16

2 stops22h 46m

Seattle/Tacoma Intl

Fri 20/3

16:10-22:00

2 stops22h 50m

£873

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 13/3

06:30-22:16

2 stops22h 46m

Seattle/Tacoma Intl

Fri 20/3

08:00-15:10

3 stops24h 10m

£889

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 13/3

14:30-16:40

3 stops33h 10m

Seattle/Tacoma Intl

Fri 20/3

08:00-15:10

3 stops24h 10m

£916

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 7/2

23:10-19:55

3 stops52h 45m

£423

Flights are sorted by cheapest return flights first.

Showing 1-10 of 14 resultsSorted by cheapest first

How to get the cheapest flight ticket from Belfast to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Belfast to Seattle/Tacoma Intl?

Finnair is the most popular carrier operating from Belfast to Seattle/Tacoma Intl

Cheap Belfast to Seattle flight deals and tips

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

Fastest flight time	12h 55m
Direct flights	None

The fastest flight from Belfast to Seattle takes 12h 55m

There are no direct flights from Belfast to Seattle. There are no popular flight routes from Belfast to Seattle.

Search flight deals

How far is Belfast to Seattle/Tacoma Intl by plane?
Seattle/Tacoma Intl is 4463.0 mi away from Belfast. By plane, this route typically takes 12h 55m.
When did momondo last update prices for flights from Belfast to Seattle/Tacoma Intl Airport?
Prices for flights from Belfast to Seattle/Tacoma Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Belfast to Seattle/Tacoma Intl Airport?
As of January 2026, there are 2 operators available to choose from for flights from Belfast to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Belfast to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Belfast to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Belfast to Seattle

Compare and see reviews for airlines that fly from Belfast to Seattle with momondo

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom £424	Free Cancellation	Rating 6.7 7,705 reviews		Search British Airways flights
American Airlines	PriceFrom £544	Free Cancellation	Rating 7.2 11,206 reviews		Search American Airlines flights

Fife

SeaTac

Tukwila

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

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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 provides multiple filters to help you find the best flight to Seattle from Belfast. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes momondo offers price alerts on flights to Seattle from Belfast. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.