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Cheap flights from Seattle to Belfast from $378

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 12/26. 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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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 - 6:00 pmSEA-BHD
15h 10m1 stop
British Airways Logo
8:00 pm - 4:55 pmBHD-SEA
28h 55m1 stop
$665British Airways
Find Deal
Thu, Dec 4 - Thu, Dec 11
Finnair Logo
8:30 am - 2:15 pmSEA-BHD
21h 45m2 stops
Finnair Logo
11:30 am - 4:55 pmBHD-SEA
13h 25m1 stop
$670Finnair
Find Deal
Wed, Dec 3 - Fri, Dec 12
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
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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
$688Virgin Atlantic
Find Deal
Wed, Dec 3 - Sun, Dec 7
Delta Logo
7:20 am - 9:00 pmSEA-BHD
29h 40m2 stops
Delta Logo
5:20 pm - 11:50 amBHD-SEA
26h 30m1 stop
$689Delta
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Wed, Dec 3 - Sun, Dec 7
Delta Logo
11:30 am - 9:00 pmSEA-BHD
25h 30m2 stops
Delta Logo
5:20 pm - 11:50 amBHD-SEA
26h 30m1 stop
$690Delta
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 - 8:00 pmBHD-SEA
34h 40m2 stops
$698Virgin Atlantic
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
$787Multiple Airlines
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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
$788Multiple Airlines
Find Deal
Sat, Mar 7 - Tue, Mar 17
KLM Logo
3:00 pm - 4:50 pmSEA-BHD
17h 50m1 stop
KLM Logo
6:30 am - 11:45 amBHD-SEA
13h 15m1 stop
$867KLM
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Tue, Nov 4 - Fri, Nov 28

British Airways flights from Seattle to Belfast City Airport

Our best British Airways deals on Seattle to Belfast City Airport flight tickets
British Airways
Dec 4
SEA6:50 pmSeattle/Tacoma Intl
15h 10m
1 stop
BHD6:00 pmBelfast City
Dec 11
BHD8:00 pmBelfast City
28h 55m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$665
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 11
BHD5:45 pmBelfast City
25h 45m
1 stop
SEA11:30 amSeattle/Tacoma Intl
$674
Find similar

Virgin Atlantic flights from Seattle to Belfast City Airport

Our best Virgin Atlantic deals on Seattle to Belfast City Airport flight tickets
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
$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
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 City Airport 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 19, 2025.
Use the filters below to find and compare flights from Seattle to Belfast City Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 12/4

6:50 pm-6:00 pm

1 stop15h 10m

Belfast City

Thu 12/11

8:00 pm-4:55 pm

1 stop28h 55m

$665

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

8:30 am-2:15 pm

2 stops21h 45m

Belfast City

Fri 12/12

11:30 am-4:55 pm

1 stop13h 25m

$670

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

7:20 am-9:00 pm

2 stops29h 40m

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-11:50 am

1 stop26h 30m

$690

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-8:00 pm

2 stops34h 40m

$698

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

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

$788

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 11/4

3:00 pm-4:50 pm

1 stop17h 50m

Belfast City

Fri 11/28

6:30 am-11:45 am

1 stop13h 15m

$867

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 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 City Airport

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 City Airport?

On average, the least expensive day to fly to Belfast City Airport from Seattle is on a Thursday. momondo users have found tickets for Thursday departures for as low as $782. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Friday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $794.

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

According to our data, the cheapest time of day to fly to Belfast City Airport is in the evening. momondo users have found flights departing from Seattle to Belfast City Airport in the evening for as low as $772. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights at noon are often more expensive with an average ticket price of $782.

When to book flights from Seattle to Belfast City Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Belfast City Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Belfast City Airport (SEA to BHD) flight deals and tips

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

Direct flights

None
There are no direct flights from Seattle to Belfast City Airport. There are no popular flight routes from Seattle to Belfast City Airport.
Search flight deals

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

    Belfast City is 4463.4 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 City Airport?

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Belfast City Airport.

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

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

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Newcastle
Bangor

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Seattle to Belfast. momondo saves you time and could save you money on your trip.

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?

Price alerts on flights to Belfast from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Belfast City Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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