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Cheap flights from Seattle to Belfast from $389

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 9/3. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
6:45 pm - 4:35 pm
SEA
-
BHD
13h 50m
1 stop
British Airways Logo
7:25 pm - 11:25 am
BHD
-
SEA
24h 00m
1 stop
$888British Airways
Wed, Nov 11 - Mon, Nov 16
Multiple Airlines Logo
3:40 pm - 8:20 pm
SEA
-
BFS
20h 40m
3 stops
Multiple Airlines Logo
9:40 pm - 6:45 pm
BFS
-
SEA
29h 05m
3 stops
$893Multiple Airlines
Sat, Aug 29 - Sat, Sep 5
Multiple Airlines Logo
3:40 pm - 10:15 pm
SEA
-
BFS
22h 35m
2 stops
Multiple Airlines Logo
9:40 pm - 6:45 pm
BFS
-
SEA
29h 05m
3 stops
$896Multiple Airlines
Sat, Aug 29 - Sat, Sep 5
Multiple Airlines Logo
7:00 pm - 10:15 pm
SEA
-
BFS
19h 15m
2 stops
Multiple Airlines Logo
6:20 am - 8:40 pm
BFS
-
SEA
22h 20m
2 stops
$907Multiple Airlines
Sat, Aug 29 - Sat, Sep 5
British Airways Logo
8:11 am - 10:15 am
SEA
-
BHD
18h 04m
2 stops
British Airways Logo
7:25 pm - 11:25 am
BHD
-
SEA
24h 00m
1 stop
$913British Airways
Wed, Nov 11 - Mon, Nov 16
Multiple Airlines Logo
3:40 pm - 8:15 pm
SEA
-
BFS
20h 35m
2 stops
Multiple Airlines Logo
9:55 am - 11:45 am
BFS
-
SEA
33h 50m
2 stops
$914Multiple Airlines
Sun, Aug 23 - Sun, Aug 30
British Airways Logo
6:45 pm - 6:40 pm
SEA
-
BHD
15h 55m
1 stop
British Airways Logo
9:05 am - 4:50 pm
BHD
-
SEA
15h 45m
1 stop
$916British Airways
Sun, Jan 10 - Thu, Jan 14
British Airways Logo
6:45 pm - 6:40 pm
SEA
-
BHD
15h 55m
1 stop
British Airways Logo
9:05 am - 4:50 pm
BHD
-
SEA
15h 45m
1 stop
$917British Airways
Sun, Jan 10 - Thu, Jan 14
Multiple Airlines Logo
2:35 pm - 8:45 pm
SEA
-
BFS
22h 10m
3 stops
Multiple Airlines Logo
6:30 am - 5:00 pm
BFS
-
SEA
18h 30m
2 stops
$921Multiple Airlines
Wed, Nov 11 - Mon, Nov 16
British Airways Logo
8:11 am - 10:15 am
SEA
-
BHD
18h 04m
2 stops
British Airways Logo
9:15 am - 10:15 pm
BHD
-
SEA
21h 00m
2 stops
$933British Airways
Wed, Nov 11 - Mon, Nov 16

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British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets
British Airways
Nov 11
SEA6:45 pmSeattle/Tacoma Intl
13h 50m
1 stop
BHD4:35 pmBelfast City
Nov 16
BHD7:25 pmBelfast City
24h 00m
1 stop
SEA11:25 amSeattle/Tacoma Intl
$888
British Airways
Nov 11
SEA8:11 amSeattle/Tacoma Intl
18h 04m
2 stops
BHD10:15 amBelfast City
Nov 16
BHD7:25 pmBelfast City
24h 00m
1 stop
SEA11:25 amSeattle/Tacoma Intl
$913
British Airways
Jan 10
SEA6:45 pmSeattle/Tacoma Intl
15h 55m
1 stop
BHD6:40 pmBelfast City
Jan 14
BHD9:05 amBelfast City
15h 45m
1 stop
SEA4:50 pmSeattle/Tacoma Intl
$916

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 July 18, 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 - BHD

SEABHD

Seattle/Tacoma Intl

Wed 11/11

6:45 pm-4:35 pm

1 stop13h 50m

Belfast City

Mon 11/16

7:25 pm-11:25 am

1 stop24h 00m

$888

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 8/29

3:40 pm-8:20 pm

3 stops20h 40m

Belfast Intl

Sat 9/5

9:40 pm-6:45 pm

3 stops29h 05m

$893

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 8/29

3:40 pm-10:15 pm

2 stops22h 35m

Belfast Intl

Sat 9/5

9:40 pm-6:45 pm

3 stops29h 05m

$896

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 8/29

7:00 pm-10:15 pm

2 stops19h 15m

Belfast Intl

Sat 9/5

6:20 am-8:40 pm

2 stops22h 20m

$907

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 11/11

8:11 am-10:15 am

2 stops18h 04m

Belfast City

Mon 11/16

7:25 pm-11:25 am

1 stop24h 00m

$913

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 8/23

3:40 pm-8:15 pm

2 stops20h 35m

Belfast Intl

Sun 8/30

9:55 am-11:45 am

2 stops33h 50m

$914
Quickest round-trip

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 1/10

6:45 pm-6:40 pm

1 stop15h 55m

Belfast City

Thu 1/14

9:05 am-4:50 pm

1 stop15h 45m

$916

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 1/10

6:45 pm-6:40 pm

1 stop15h 55m

Belfast City

Thu 1/14

9:05 am-4:50 pm

1 stop15h 45m

$917

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 11/11

2:35 pm-8:45 pm

3 stops22h 10m

Belfast Intl

Mon 11/16

6:30 am-5:00 pm

2 stops18h 30m

$921

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 11/11

8:11 am-10:15 am

2 stops18h 04m

Belfast City

Mon 11/16

9:15 am-10:15 pm

2 stops21h 00m

$933

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?

Delta is the most popular carrier 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

13h 50m

Direct flights

None
The fastest flight from Seattle to Belfast takes 13h 50m
There are no direct flights from Seattle to Belfast. There are no popular flight routes from Seattle to Belfast.
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Frequently asked questions about flying from Seattle to Belfast

  • 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 13h 50m.

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

  • 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.

Best airlines flying from Seattle to Belfast

Compare and see reviews for airlines that fly from Seattle to Belfast with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $807Free CancellationRating
6.7
8,124 reviews
Search British Airways flights

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