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Cheap flights from Seattle to Belfast from $297

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Belfast departing on 7/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Seattle to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:40 pm - 9:30 pm
SEA
-
BFS
21h 50m
2 stops
Multiple Airlines Logo
10:10 pm - 9:40 am
BFS
-
SEA
43h 30m
3 stops
$668Multiple Airlines
Sun, Apr 19 - Sun, Apr 26
Multiple Airlines Logo
7:00 pm - 10:40 pm
SEA
-
BFS
19h 40m
2 stops
Multiple Airlines Logo
6:20 am - 8:40 pm
BFS
-
SEA
22h 20m
2 stops
$711Multiple Airlines
Sat, Apr 18 - Sat, Apr 25
Multiple Airlines Logo
3:40 pm - 9:55 pm
SEA
-
BFS
22h 15m
3 stops
Multiple Airlines Logo
10:10 pm - 9:40 am
BFS
-
SEA
43h 30m
3 stops
$720Multiple Airlines
Sun, Apr 19 - Sun, Apr 26
British Airways Logo
8:20 pm - 7:25 pm
SEA
-
BHD
15h 05m
1 stop
British Airways Logo
6:30 am - 11:35 am
BHD
-
SEA
13h 05m
1 stop
$757British Airways
Mon, Apr 20 - Wed, Apr 29
Multiple Airlines Logo
3:40 pm - 4:50 pm
SEA
-
BHD
17h 10m
2 stops
Multiple Airlines Logo
7:00 am - 6:45 pm
BHD
-
SEA
43h 45m
3 stops
$767Multiple Airlines
Mon, Apr 20 - Wed, Apr 29
British Airways Logo
1:35 pm - 1:35 pm
SEA
-
BHD
16h 00m
1 stop
British Airways Logo
6:30 am - 11:35 am
BHD
-
SEA
13h 05m
1 stop
$768British Airways
Wed, Apr 8 - Wed, Apr 29
Multiple Airlines Logo
7:00 pm - 8:30 pm
SEA
-
BHD
17h 30m
2 stops
Multiple Airlines Logo
7:00 am - 8:40 pm
BHD
-
SEA
21h 40m
2 stops
$770Multiple Airlines
Mon, Apr 20 - Wed, Apr 29
American Airlines Logo
3:17 pm - 3:30 pm
SEA
-
BHD
16h 13m
2 stops
American Airlines Logo
6:30 am - 11:35 am
BHD
-
SEA
13h 05m
1 stop
$772American Airlines
Mon, Apr 20 - Wed, Apr 29
British Airways Logo
11:16 am - 1:35 pm
SEA
-
BHD
18h 19m
2 stops
British Airways Logo
6:30 am - 11:35 am
BHD
-
SEA
13h 05m
1 stop
$773British Airways
Wed, Apr 8 - Wed, Apr 29
British Airways Logo
11:16 am - 12:00 pm
SEA
-
BHD
16h 44m
2 stops
British Airways Logo
11:35 am - 10:38 pm
BHD
-
SEA
19h 03m
2 stops
$783British Airways
Wed, Apr 8 - Wed, Apr 29

British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets
British Airways
Apr 20
SEA8:20 pmSeattle/Tacoma Intl
15h 05m
1 stop
BHD7:25 pmBelfast City
Apr 29
BHD6:30 amBelfast City
13h 05m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$757
British Airways
Apr 8
SEA1:35 pmSeattle/Tacoma Intl
16h 00m
1 stop
BHD1:35 pmBelfast City
Apr 29
BHD6:30 amBelfast City
13h 05m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$768
British Airways
Apr 8
SEA11:16 amSeattle/Tacoma Intl
18h 19m
2 stops
BHD1:35 pmBelfast City
Apr 29
BHD6:30 amBelfast City
13h 05m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$773

American Airlines flights from Seattle to Belfast

Our best American Airlines deals on Seattle to Belfast flight tickets
American Airlines
Apr 20
SEA3:17 pmSeattle/Tacoma Intl
16h 13m
2 stops
BHD3:30 pmBelfast City
Apr 29
BHD6:30 amBelfast City
13h 05m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$772
American Airlines
Apr 22
SEA1:19 pmSeattle/Tacoma Intl
16h 16m
2 stops
BHD1:35 pmBelfast City
Apr 26
BHD11:00 amBelfast City
19h 38m
2 stops
SEA10:38 pmSeattle/Tacoma Intl
$924

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Belfast 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 832,500 searches. Data last updated March 7, 2026.
Use the filters below to find and compare flights from Seattle to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 4/19

3:40 pm-9:30 pm

2 stops21h 50m

Belfast Intl

Sun 4/26

10:10 pm-9:40 am

3 stops43h 30m

$668

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 4/18

7:00 pm-10:40 pm

2 stops19h 40m

Belfast Intl

Sat 4/25

6:20 am-8:40 pm

2 stops22h 20m

$711

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 4/19

3:40 pm-9:55 pm

3 stops22h 15m

Belfast Intl

Sun 4/26

10:10 pm-9:40 am

3 stops43h 30m

$720
Quickest round-trip

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 4/20

8:20 pm-7:25 pm

1 stop15h 05m

Belfast City

Wed 4/29

6:30 am-11:35 am

1 stop13h 05m

$757

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 4/20

3:40 pm-4:50 pm

2 stops17h 10m

Belfast City

Wed 4/29

7:00 am-6:45 pm

3 stops43h 45m

$767

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 4/8

1:35 pm-1:35 pm

1 stop16h 00m

Belfast City

Wed 4/29

6:30 am-11:35 am

1 stop13h 05m

$768

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 4/20

7:00 pm-8:30 pm

2 stops17h 30m

Belfast City

Wed 4/29

7:00 am-8:40 pm

2 stops21h 40m

$770

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 4/20

3:17 pm-3:30 pm

2 stops16h 13m

Belfast City

Wed 4/29

6:30 am-11:35 am

1 stop13h 05m

$772

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 4/8

11:16 am-1:35 pm

2 stops18h 19m

Belfast City

Wed 4/29

6:30 am-11:35 am

1 stop13h 05m

$773

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 4/8

11:16 am-12:00 pm

2 stops16h 44m

Belfast City

Wed 4/29

11:35 am-10:38 pm

2 stops19h 03m

$783

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Belfast from

How to get the cheapest flight ticket from Seattle to Belfast

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 Seattle/Tacoma Intl to Belfast?

Air Europa and British Airways are the most popular carriers operating from Seattle/Tacoma Intl to Belfast

Cheap Seattle to Belfast flight deals and tips

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

Fastest flight time

12h 30m

Direct flights

None
The fastest flight from Seattle to Belfast takes 12h 30m
There are no direct flights from Seattle to Belfast. There are no popular flight routes from Seattle to Belfast.
Search flight deals

  • How far is Seattle/Tacoma Intl to Belfast by plane?

    Belfast is 4463.0 mi away from Seattle/Tacoma Intl. In terms of flight time, this usually takes a little over 12h 30m.

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

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Belfast.

  • What documentation or ID do you need to fly to Belfast?

    The travel and health documents required for your trip to Belfast 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 Belfast. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Belfast. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Seattle to Belfast with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Belfast from Seattle with this policy.

How can momondo help me find flights from Seattle to Belfast?

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

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

Yes. momondo can track prices for Seattle to Belfast flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport