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Cheap flights from Belfast to Seattle from £563

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Belfast to Seattle departing on 31/8. 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
1 adult, Economy, 0 bags

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Find the cheapest flights from Belfast to Seattle

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
06:10 - 20:40
BFS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
15:40 - 15:30
SEA
-
BFS
15h 50m
2 stops
£563Multiple Airlines
Mon, 31 Aug - Mon, 7 Sep
Multiple Airlines Logo
06:05 - 20:40
BFS
-
SEA
22h 35m
2 stops
Multiple Airlines Logo
15:35 - 14:30
SEA
-
BFS
15h 55m
2 stops
£583Multiple Airlines
Fri, 23 Oct - Tue, 27 Oct
Multiple Airlines Logo
07:00 - 20:40
BHD
-
SEA
21h 40m
2 stops
Multiple Airlines Logo
15:35 - 20:30
SEA
-
BHD
21h 55m
2 stops
£595Multiple Airlines
Fri, 23 Oct - Tue, 27 Oct
Multiple Airlines Logo
06:10 - 17:55
BFS
-
SEA
19h 45m
2 stops
Multiple Airlines Logo
15:40 - 15:30
SEA
-
BFS
15h 50m
2 stops
£603Multiple Airlines
Thu, 3 Sep - Mon, 7 Sep
Multiple Airlines Logo
07:00 - 17:55
BHD
-
SEA
18h 55m
2 stops
Multiple Airlines Logo
19:00 - 20:30
SEA
-
BHD
17h 30m
2 stops
£616Multiple Airlines
Thu, 3 Sep - Mon, 7 Sep
British Airways Logo
09:35 - 18:25
BHD
-
SEA
16h 50m
1 stop
British Airways Logo
19:45 - 14:50
SEA
-
BHD
12h 05m
1 stop
£653British Airways
Fri, 23 Oct - Tue, 27 Oct
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
13:30 - 12:55
SEA
-
BHD
15h 25m
1 stop
£667British Airways
Thu, 3 Sep - Mon, 7 Sep
British Airways Logo
09:35 - 20:52
BHD
-
SEA
19h 17m
2 stops
British Airways Logo
13:30 - 12:55
SEA
-
BHD
15h 25m
1 stop
£688British Airways
Thu, 3 Sep - Mon, 7 Sep
Multiple Airlines Logo
06:10 - 20:40
BFS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
15:40 - 23:05
SEA
-
BFS
23h 25m
3 stops
£703Multiple Airlines
Mon, 31 Aug - Mon, 7 Sep
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
06:15 - 10:30
SEA
-
BHD
20h 15m
2 stops
£711British Airways
Thu, 17 Sep - Sun, 20 Sep

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British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets
British Airways
23 Oct
BHD09:35Belfast City
16h 50m
1 stop
SEA18:25Seattle/Tacoma Intl
27 Oct
SEA19:45Seattle/Tacoma Intl
12h 05m
1 stop
BHD14:50Belfast City
£653
British Airways
3 Sept
BHD20:35Belfast City
23h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
7 Sept
SEA13:30Seattle/Tacoma Intl
15h 25m
1 stop
BHD12:55Belfast City
£667
British Airways
3 Sept
BHD09:35Belfast City
19h 17m
2 stops
SEA20:52Seattle/Tacoma Intl
7 Sept
SEA13:30Seattle/Tacoma Intl
15h 25m
1 stop
BHD12:55Belfast City
£688

momondo Fare Finder

 
Customise your flight search to find flights from Belfast 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 20 July 2026.
Use the filters below to find and compare flights from Belfast to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 31/8

06:10-20:40

2 stops22h 30m

Seattle/Tacoma Intl

Mon 7/9

15:40-15:30

2 stops15h 50m

£563

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 23/10

06:05-20:40

2 stops22h 35m

Seattle/Tacoma Intl

Tue 27/10

15:35-14:30

2 stops15h 55m

£583

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 23/10

07:00-20:40

2 stops21h 40m

Seattle/Tacoma Intl

Tue 27/10

15:35-20:30

2 stops21h 55m

£595

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 3/9

06:10-17:55

2 stops19h 45m

Seattle/Tacoma Intl

Mon 7/9

15:40-15:30

2 stops15h 50m

£603

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/9

07:00-17:55

2 stops18h 55m

Seattle/Tacoma Intl

Mon 7/9

19:00-20:30

2 stops17h 30m

£616
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 23/10

09:35-18:25

1 stop16h 50m

Seattle/Tacoma Intl

Tue 27/10

19:45-14:50

1 stop12h 05m

£653

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Mon 7/9

13:30-12:55

1 stop15h 25m

£667

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/9

09:35-20:52

2 stops19h 17m

Seattle/Tacoma Intl

Mon 7/9

13:30-12:55

1 stop15h 25m

£688

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 31/8

06:10-20:40

2 stops22h 30m

Seattle/Tacoma Intl

Mon 7/9

15:40-23:05

3 stops23h 25m

£703

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 17/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 20/9

06:15-10:30

2 stops20h 15m

£711

Flights are sorted by cheapest return flights first.

Showing 1-10 of 18 resultsSorted by cheapest first
1
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See travel insights to Seattle from

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?

Aer Lingus and British Airways are the most popular carriers 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

13h 05m

Direct flights

None
The fastest flight from Belfast to Seattle takes 13h 05m
There are no direct flights from Belfast to Seattle. There are no popular flight routes from Belfast to Seattle.
Search flight deals

Frequently asked questions about flying from Belfast to Seattle

  • 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 13h 05m.

  • 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?

  • 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
American AirlinesPriceFrom £558Free CancellationRating
7.1
11,826 reviews
Search American Airlines flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Westport
Kirkland
Ashford
Tacoma
SeaTac
Tukwila
Fife

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 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.

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