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Cheap flights from Seattle to Belfast from $340

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 5/31. 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
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.
British Airways Logo
8:20 pm - 6:45 pm
SEA
-
BHD
14h 25m
1 stop
British Airways Logo
6:30 am - 11:35 am
BHD
-
SEA
13h 05m
1 stop
$891British Airways
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
8:20 pm - 6:45 pm
SEA
-
BHD
14h 25m
1 stop
British Airways Logo
7:40 pm - 11:35 am
BHD
-
SEA
23h 55m
1 stop
$910British Airways
Sun, Sep 27 - Wed, Sep 30
British Airways Logo
11:34 am - 12:55 pm
SEA
-
BHD
17h 21m
2 stops
British Airways Logo
9:35 am - 6:25 pm
BHD
-
SEA
16h 50m
1 stop
$914British Airways
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
1:30 pm - 12:00 pm
SEA
-
BHD
14h 30m
1 stop
British Airways Logo
8:25 pm - 11:35 am
BHD
-
SEA
23h 10m
1 stop
$919British Airways
Wed, Sep 9 - Tue, Sep 15
Multiple Airlines Logo
3:40 pm - 11:55 pm
SEA
-
BFS
24h 15m
3 stops
Multiple Airlines Logo
6:40 am - 10:40 pm
BFS
-
SEA
24h 00m
3 stops
$920Multiple Airlines
Thu, Jun 4 - Thu, Jun 11
British Airways Logo
11:34 am - 12:55 pm
SEA
-
BHD
17h 21m
2 stops
British Airways Logo
12:45 pm - 12:14 am
BHD
-
SEA
19h 29m
2 stops
$924British Airways
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
11:34 am - 12:55 pm
SEA
-
BHD
17h 21m
2 stops
British Airways Logo
12:45 pm - 12:14 am
BHD
-
SEA
19h 29m
2 stops
$925British Airways
Mon, Oct 5 - Thu, Oct 22
Multiple Airlines Logo
3:40 pm - 8:20 pm
SEA
-
BFS
20h 40m
3 stops
Multiple Airlines Logo
6:40 am - 9:40 am
BFS
-
SEA
35h 00m
2 stops
$930Multiple Airlines
Thu, Jun 4 - Thu, Jun 11
British Airways Logo
8:20 pm - 7:25 pm
SEA
-
BHD
15h 05m
1 stop
British Airways Logo
7:35 pm - 11:35 am
BHD
-
SEA
24h 00m
1 stop
$941British Airways
Mon, Aug 24 - Mon, Aug 31
British Airways Logo
1:24 pm - 7:50 pm
SEA
-
BHD
22h 26m
2 stops
British Airways Logo
7:30 pm - 11:35 am
BHD
-
SEA
24h 05m
1 stop
$969British Airways
Wed, Sep 9 - Tue, Sep 15

American Airlines flights from Seattle to Belfast

Our best American Airlines deals on Seattle to Belfast flight tickets
American Airlines
Aug 24
SEA3:10 pmSeattle/Tacoma Intl
16h 20m
2 stops
BHD3:30 pmBelfast City
Aug 31
BHD6:30 amBelfast City
17h 30m
2 stops
SEA4:00 pmSeattle/Tacoma Intl
$1,006
American Airlines
Sep 21
SEA1:24 pmSeattle/Tacoma Intl
18h 06m
2 stops
BHD3:30 pmBelfast City
Oct 3
BHD7:05 amBelfast City
20h 19m
2 stops
SEA7:24 pmSeattle/Tacoma Intl
$1,047

Delta flights from Seattle to Belfast

Our best Delta deals on Seattle to Belfast flight tickets
Delta
Jul 27
SEA11:59 pmSeattle/Tacoma Intl
25h 21m
2 stops
BHD9:20 amBelfast City
Aug 11
BHD5:30 pmBelfast City
30h 57m
1 stop
SEA4:27 pmSeattle/Tacoma Intl
$1,010
Delta
Jul 27
SEA11:59 pmSeattle/Tacoma Intl
25h 21m
2 stops
BHD9:20 amBelfast City
Aug 11
BHD5:30 pmBelfast City
30h 43m
2 stops
SEA4:13 pmSeattle/Tacoma Intl
$1,020
Delta
Jul 27
SEA5:40 pmSeattle/Tacoma Intl
15h 15m
1 stop
BHD4:55 pmBelfast City
Aug 13
BHD5:30 pmBelfast City
30h 57m
1 stop
SEA4:27 pmSeattle/Tacoma Intl
$1,054

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 April 21, 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
Quickest round-trip

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

8:20 pm-6:45 pm

1 stop14h 25m

Belfast City

Thu 10/22

6:30 am-11:35 am

1 stop13h 05m

$891

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 9/27

8:20 pm-6:45 pm

1 stop14h 25m

Belfast City

Wed 9/30

7:40 pm-11:35 am

1 stop23h 55m

$910

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

11:34 am-12:55 pm

2 stops17h 21m

Belfast City

Thu 10/22

9:35 am-6:25 pm

1 stop16h 50m

$914

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 9/9

1:30 pm-12:00 pm

1 stop14h 30m

Belfast City

Tue 9/15

8:25 pm-11:35 am

1 stop23h 10m

$919

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 6/4

3:40 pm-11:55 pm

3 stops24h 15m

Belfast Intl

Thu 6/11

6:40 am-10:40 pm

3 stops24h 00m

$920

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

11:34 am-12:55 pm

2 stops17h 21m

Belfast City

Thu 10/22

12:45 pm-12:14 am

2 stops19h 29m

$924

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

11:34 am-12:55 pm

2 stops17h 21m

Belfast City

Thu 10/22

12:45 pm-12:14 am

2 stops19h 29m

$925

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 6/4

3:40 pm-8:20 pm

3 stops20h 40m

Belfast Intl

Thu 6/11

6:40 am-9:40 am

2 stops35h 00m

$930

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 8/24

8:20 pm-7:25 pm

1 stop15h 05m

Belfast City

Mon 8/31

7:35 pm-11:35 am

1 stop24h 00m

$941

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 9/9

1:24 pm-7:50 pm

2 stops22h 26m

Belfast City

Tue 9/15

7:30 pm-11:35 am

1 stop24h 05m

$969

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 typical price of a round-trip flight between Seattle and 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 40m

Direct flights

None
The fastest flight from Seattle to Belfast takes 12h 40m
There are no direct flights from Seattle to Belfast. There are no popular flight routes from Seattle to Belfast.
Search flight deals

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 12h 40m.

  • 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 $776Free CancellationRating
6.7
7,899 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