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Cheap flights from Seattle to Belfast from $380

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 12/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
6:50 pm - 4:35 pmSEA-BHD
13h 45m1 stop
British Airways Logo
5:35 pm - 4:55 pmBHD-SEA
31h 20m1 stop
$664British Airways
Find Deal
Wed, Dec 3 - Sun, Dec 7
British Airways Logo
6:50 pm - 7:30 amSEA-BHD
28h 40m1 stop
British Airways Logo
5:35 pm - 4:55 pmBHD-SEA
31h 20m1 stop
$673British Airways
Find Deal
Wed, Dec 3 - Sun, Dec 7
British Airways Logo
6:50 pm - 7:30 amSEA-BHD
28h 40m1 stop
British Airways Logo
5:35 pm - 4:55 pmBHD-SEA
31h 20m1 stop
$674British Airways
Find Deal
Wed, Dec 3 - Sun, Dec 7
Virgin Atlantic Logo
11:30 am - 9:00 pmSEA-BHD
25h 30m2 stops
Virgin Atlantic Logo
5:20 pm - 11:50 amBHD-SEA
26h 30m1 stop
$688Virgin Atlantic
Find Deal
Wed, Dec 3 - Sun, Dec 7
Virgin Atlantic Logo
7:20 am - 9:00 pmSEA-BHD
29h 40m2 stops
Virgin Atlantic Logo
5:20 pm - 11:50 amBHD-SEA
26h 30m1 stop
$689Virgin Atlantic
Find Deal
Wed, Dec 3 - Sun, Dec 7
Virgin Atlantic Logo
11:30 am - 9:00 pmSEA-BHD
25h 30m2 stops
Virgin Atlantic Logo
5:20 pm - 8:00 pmBHD-SEA
34h 40m2 stops
$698Virgin Atlantic
Find Deal
Wed, Dec 3 - Sun, Dec 7
Delta Logo
7:20 am - 9:00 pmSEA-BHD
29h 40m2 stops
Delta Logo
6:30 am - 10:22 pmBHD-SEA
23h 52m2 stops
$699Delta
Find Deal
Wed, Dec 3 - Sun, Dec 7
Multiple Airlines Logo
1:35 pm - 2:15 pmSEA-BHD
16h 40m1 stop
Multiple Airlines Logo
11:25 am - 12:49 amBHD-SEA
20h 24m2 stops
$786Multiple Airlines
Find Deal
Sat, Mar 7 - Tue, Mar 17
Multiple Airlines Logo
1:35 pm - 2:15 pmSEA-BHD
16h 40m1 stop
Multiple Airlines Logo
11:25 am - 12:49 amBHD-SEA
20h 24m2 stops
$787Multiple Airlines
Find Deal
Sat, Mar 7 - Tue, Mar 17
American Airlines Logo
2:35 pm - 2:15 pmSEA-BHD
16h 40m1 stop
American Airlines Logo
6:35 am - 11:08 pmBHD-SEA
24h 33m2 stops
$982American Airlines
Find Deal
Fri, Mar 27 - Tue, Mar 31

British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets
British Airways
Dec 3
SEA6:50 pmSeattle/Tacoma Intl
13h 45m
1 stop
BHD4:35 pmBelfast City
Dec 7
BHD5:35 pmBelfast City
31h 20m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$664
Find similar
British Airways
Dec 3
SEA6:50 pmSeattle/Tacoma Intl
28h 40m
1 stop
BHD7:30 amBelfast City
Dec 7
BHD5:35 pmBelfast City
31h 20m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$673
Find similar
British Airways
Dec 3
SEA6:50 pmSeattle/Tacoma Intl
28h 40m
1 stop
BHD7:30 amBelfast City
Dec 7
BHD5:35 pmBelfast City
31h 20m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$674
Find similar

Virgin Atlantic flights from Seattle to Belfast

Our best Virgin Atlantic deals on Seattle to Belfast flight tickets
Virgin Atlantic
Dec 3
SEA11:30 amSeattle/Tacoma Intl
25h 30m
2 stops
BHD9:00 pmBelfast City
Dec 7
BHD5:20 pmBelfast City
26h 30m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$688
Find similar
Virgin Atlantic
Dec 3
SEA7:20 amSeattle/Tacoma Intl
29h 40m
2 stops
BHD9:00 pmBelfast City
Dec 7
BHD5:20 pmBelfast City
26h 30m
1 stop
SEA11:50 amSeattle/Tacoma Intl
$689
Find similar
Virgin Atlantic
Dec 3
SEA11:30 amSeattle/Tacoma Intl
25h 30m
2 stops
BHD9:00 pmBelfast City
Dec 7
BHD5:20 pmBelfast City
34h 40m
2 stops
SEA8:00 pmSeattle/Tacoma Intl
$698
Find similar

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 October 16, 2025.
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

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

6:50 pm-4:35 pm

1 stop13h 45m

Belfast City

Sun 12/7

5:35 pm-4:55 pm

1 stop31h 20m

$664

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

6:50 pm-7:30 am

1 stop28h 40m

Belfast City

Sun 12/7

5:35 pm-4:55 pm

1 stop31h 20m

$673

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

6:50 pm-7:30 am

1 stop28h 40m

Belfast City

Sun 12/7

5:35 pm-4:55 pm

1 stop31h 20m

$674

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

11:30 am-9:00 pm

2 stops25h 30m

Belfast City

Sun 12/7

5:20 pm-11:50 am

1 stop26h 30m

$688

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

7:20 am-9:00 pm

2 stops29h 40m

Belfast City

Sun 12/7

5:20 pm-11:50 am

1 stop26h 30m

$689

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

11:30 am-9:00 pm

2 stops25h 30m

Belfast City

Sun 12/7

5:20 pm-8:00 pm

2 stops34h 40m

$698

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

7:20 am-9:00 pm

2 stops29h 40m

Belfast City

Sun 12/7

6:30 am-10:22 pm

2 stops23h 52m

$699

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

1:35 pm-2:15 pm

1 stop16h 40m

Belfast City

Tue 3/17

11:25 am-12:49 am

2 stops20h 24m

$786

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

1:35 pm-2:15 pm

1 stop16h 40m

Belfast City

Tue 3/17

11:25 am-12:49 am

2 stops20h 24m

$787

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 3/27

2:35 pm-2:15 pm

1 stop16h 40m

Belfast City

Tue 3/31

6:35 am-11:08 pm

2 stops24h 33m

$982

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 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 day to depart on your flight to Belfast?

The cheapest day to depart from Seattle to Belfast is on a Tuesday when prices can be found for as low as $724. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to Belfast for around $1,208.

What is the cheapest time of day to depart on your flight to Belfast?

Our data shows that the cheapest Seattle to Belfast flights are usually those with departure times at noon. Our users have found flights to Belfast at noon for as low as $794. Try not to purchase tickets in the afternoon because they tend to be around $1,000. Of course, these prices can vary depending on the time of year and what airport you fly to.

Cheap Seattle to Belfast flight deals and tips

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

Direct flights

None
There are no direct flights from Seattle to Belfast. There are no popular flight routes from Seattle to Belfast.
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  • 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 55m.

  • 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 $737Free CancellationRating
6.7
7,457 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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Sat 11/15
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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