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Cheap flights from Seattle to Belfast from $310

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 8/17. 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.
Multiple Airlines Logo
3:40 pm - 10:25 pm
SEA
-
BFS
22h 45m
3 stops
Multiple Airlines Logo
11:30 pm - 9:40 am
BFS
-
SEA
42h 10m
3 stops
$971Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
7:10 pm - 8:55 pm
SEA
-
BFS
17h 45m
2 stops
Multiple Airlines Logo
11:30 pm - 9:40 am
BFS
-
SEA
42h 10m
3 stops
$990Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
7:00 pm - 10:25 pm
SEA
-
BFS
19h 25m
2 stops
Multiple Airlines Logo
8:20 am - 11:45 am
BFS
-
SEA
35h 25m
2 stops
$1,050Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
3:40 pm - 4:25 pm
SEA
-
BFS
16h 45m
2 stops
Multiple Airlines Logo
8:30 am - 9:40 am
BFS
-
SEA
33h 10m
2 stops
$1,075Multiple Airlines
Tue, Jun 2 - Wed, Jun 10
Multiple Airlines Logo
3:40 pm - 10:25 pm
SEA
-
BFS
22h 45m
2 stops
Multiple Airlines Logo
8:20 am - 5:55 pm
BFS
-
SEA
17h 35m
2 stops
$1,084Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
7:00 pm - 10:50 pm
SEA
-
BFS
19h 50m
2 stops
Multiple Airlines Logo
6:30 am - 9:40 am
BFS
-
SEA
35h 10m
2 stops
$1,095Multiple Airlines
Thu, Jun 4 - Mon, Jun 8
Multiple Airlines Logo
3:40 pm - 4:25 pm
SEA
-
BFS
16h 45m
2 stops
Multiple Airlines Logo
6:10 am - 9:40 am
BFS
-
SEA
35h 30m
3 stops
$1,102Multiple Airlines
Tue, Jun 2 - Thu, Jun 11
Multiple Airlines Logo
5:45 am - 4:30 pm
SEA
-
BFS
26h 45m
3 stops
Multiple Airlines Logo
6:10 am - 8:40 pm
BFS
-
SEA
22h 30m
2 stops
$1,119Multiple Airlines
Fri, Sep 4 - Wed, Sep 9
Multiple Airlines Logo
8:00 am - 4:30 pm
SEA
-
BFS
24h 30m
2 stops
Multiple Airlines Logo
6:10 am - 8:40 pm
BFS
-
SEA
22h 30m
2 stops
$1,129Multiple Airlines
Fri, Sep 4 - Wed, Sep 9
Multiple Airlines Logo
3:40 pm - 3:15 pm
SEA
-
BFS
15h 35m
2 stops
Multiple Airlines Logo
5:55 am - 10:05 am
BFS
-
SEA
36h 10m
3 stops
$1,133Multiple Airlines
Tue, Jun 2 - Wed, Jun 10

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Belfast Intl 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 May 7, 2026.
Use the filters below to find and compare flights from Seattle to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 8/17

3:40 pm-10:25 pm

3 stops22h 45m

Belfast Intl

Tue 8/25

11:30 pm-9:40 am

3 stops42h 10m

$971

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 8/17

7:10 pm-8:55 pm

2 stops17h 45m

Belfast Intl

Tue 8/25

11:30 pm-9:40 am

3 stops42h 10m

$990

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 8/17

7:00 pm-10:25 pm

2 stops19h 25m

Belfast Intl

Tue 8/25

8:20 am-11:45 am

2 stops35h 25m

$1,050

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 6/2

3:40 pm-4:25 pm

2 stops16h 45m

Belfast Intl

Wed 6/10

8:30 am-9:40 am

2 stops33h 10m

$1,075
Quickest round-trip

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 8/17

3:40 pm-10:25 pm

2 stops22h 45m

Belfast Intl

Tue 8/25

8:20 am-5:55 pm

2 stops17h 35m

$1,084

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 6/4

7:00 pm-10:50 pm

2 stops19h 50m

Belfast Intl

Mon 6/8

6:30 am-9:40 am

2 stops35h 10m

$1,095

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 6/2

3:40 pm-4:25 pm

2 stops16h 45m

Belfast Intl

Thu 6/11

6:10 am-9:40 am

3 stops35h 30m

$1,102

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 9/4

5:45 am-4:30 pm

3 stops26h 45m

Belfast Intl

Wed 9/9

6:10 am-8:40 pm

2 stops22h 30m

$1,119

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 9/4

8:00 am-4:30 pm

2 stops24h 30m

Belfast Intl

Wed 9/9

6:10 am-8:40 pm

2 stops22h 30m

$1,129

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 6/2

3:40 pm-3:15 pm

2 stops15h 35m

Belfast Intl

Wed 6/10

5:55 am-10:05 am

3 stops36h 10m

$1,133

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 Intl 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 month to fly to Belfast Intl Airport?

The month of July is, on average, the cheapest month to fly to Belfast Intl Airport from Seattle, with most prices found around $0. If you’re not able to fly to Belfast Intl Airport in July, then January is your next best option. Flight prices from Seattle to Belfast Intl Airport during January average around $0.

When to book flights from Seattle to Belfast Intl Airport

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

Cheap Seattle to Belfast Intl Airport (SEA to BFS) flight deals and tips

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

Fastest flight time

14h 05m

Direct flights

None
The fastest flight from Seattle to Belfast Intl Airport takes 14h 05m
There are no direct flights from Seattle to Belfast Intl Airport. There are no popular flight routes from Seattle to Belfast Intl Airport.
Search flight deals

Frequently asked questions about flying from Seattle to Belfast Intl Airport

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

    Belfast Intl is 4452.2 mi away from Seattle/Tacoma Intl. By plane, this route typically takes 14h 05m.

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

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

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

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

    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 Intl Airport.

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

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

  • What is the most popular airline from Seattle to Belfast Intl Airport?

Best airlines flying from Seattle to Belfast Intl Airport

Compare and see reviews for airlines that fly from Seattle to Belfast Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $776Free CancellationRating
6.7
7,949 reviews
Search British Airways flights

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Armagh
Cookstown
Ballymena
Newry
Dungannon

Why use momondo?

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

It is quick and easy to find Seattle to Belfast flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Belfast that suits you.

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

Flights from Seattle to Belfast with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Belfast.

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.

An easier way to manage your Belfast Intl Airport trip

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