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Cheap flights from Seattle to Belfast from £237

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 17/8. 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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0 bags
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Find the cheapest flights from Seattle to Belfast

Cheap return flights

Enter your travel dates to find the best prices.
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
£658British Airways
Mon, 5 Oct - Thu, 22 Oct
British Airways Logo
13:30 - 10:30
SEA
-
BHD
13h 00m
1 stop
British Airways Logo
16:35 - 11:35
BHD
-
SEA
27h 00m
1 stop
£672British Airways
Sun, 27 Sep - Thu, 1 Oct
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
£672British Airways
Sun, 27 Sep - Thu, 1 Oct
Multiple Airlines Logo
15:10 - 15:30
SEA
-
BHD
16h 20m
2 stops
Multiple Airlines Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
£675Multiple Airlines
Mon, 5 Oct - Thu, 22 Oct
Multiple Airlines Logo
20:20 - 18:55
SEA
-
BHD
14h 35m
1 stop
Multiple Airlines Logo
09:40 - 21:09
BHD
-
SEA
19h 29m
2 stops
£681Multiple Airlines
Tue, 8 Sep - Tue, 15 Sep
Multiple Airlines Logo
15:10 - 15:30
SEA
-
BHD
16h 20m
2 stops
Multiple Airlines Logo
12:45 - 00:14
BHD
-
SEA
19h 29m
2 stops
£683Multiple Airlines
Mon, 5 Oct - Thu, 22 Oct
Multiple Airlines Logo
15:10 - 15:30
SEA
-
BHD
16h 20m
2 stops
Multiple Airlines Logo
12:45 - 00:14
BHD
-
SEA
19h 29m
2 stops
£684Multiple Airlines
Mon, 5 Oct - Thu, 22 Oct
Multiple Airlines Logo
15:40 - 21:40
SEA
-
BFS
22h 00m
3 stops
Multiple Airlines Logo
06:30 - 18:45
BFS
-
SEA
44h 15m
3 stops
£690Multiple Airlines
Thu, 28 May - Mon, 1 Jun
British Airways Logo
13:30 - 10:10
SEA
-
BHD
12h 40m
1 stop
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
£693British Airways
Thu, 8 Oct - Thu, 22 Oct
Delta Logo
09:50 - 16:55
SEA
-
BHD
23h 05m
2 stops
Delta Logo
09:50 - 20:29
BHD
-
SEA
18h 39m
2 stops
£697Delta
Tue, 8 Sep - Tue, 15 Sep

British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets
British Airways
5 Oct
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
22 Oct
BHD20:35Belfast City
23h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
£658
British Airways
27 Sept
SEA13:30Seattle/Tacoma Intl
13h 00m
1 stop
BHD10:30Belfast City
1 Oct
BHD16:35Belfast City
27h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
£672
British Airways
27 Sept
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
1 Oct
BHD20:35Belfast City
23h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
£672

Aer Lingus flights from Seattle to Belfast

Our best Aer Lingus deals on Seattle to Belfast flight tickets
Aer Lingus
3 Jul
SEA19:10Seattle/Tacoma Intl
17h 45m
2 stops
BHD20:55Belfast City
10 Aug
BHD17:05Belfast City
32h 05m
2 stops
SEA17:10Seattle/Tacoma Intl
£960
Aer Lingus
28 May
SEA19:10Seattle/Tacoma Intl
32h 45m
2 stops
BHD11:55Belfast City
1 Jun
BHD17:25Belfast City
31h 45m
2 stops
SEA17:10Seattle/Tacoma Intl
£995

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 13 May 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 return flight

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

20:20-18:45

1 stop14h 25m

Belfast City

Thu 22/10

20:35-11:35

1 stop23h 00m

£658

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 27/9

13:30-10:30

1 stop13h 00m

Belfast City

Thu 1/10

16:35-11:35

1 stop27h 00m

£672

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 27/9

20:20-18:45

1 stop14h 25m

Belfast City

Thu 1/10

20:35-11:35

1 stop23h 00m

£672

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

15:10-15:30

2 stops16h 20m

Belfast City

Thu 22/10

06:30-11:35

1 stop13h 05m

£675

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 8/9

20:20-18:55

1 stop14h 35m

Belfast City

Tue 15/9

09:40-21:09

2 stops19h 29m

£681

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

15:10-15:30

2 stops16h 20m

Belfast City

Thu 22/10

12:45-00:14

2 stops19h 29m

£683

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

15:10-15:30

2 stops16h 20m

Belfast City

Thu 22/10

12:45-00:14

2 stops19h 29m

£684

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 28/5

15:40-21:40

3 stops22h 00m

Belfast Intl

Mon 1/6

06:30-18:45

3 stops44h 15m

£690
Fastest return journey

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 8/10

13:30-10:10

1 stop12h 40m

Belfast City

Thu 22/10

06:30-11:35

1 stop13h 05m

£693

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 8/9

09:50-16:55

2 stops23h 05m

Belfast City

Tue 15/9

09:50-20:29

2 stops18h 39m

£697

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 month to fly to Belfast?

The cheapest month to fly to Belfast from Seattle is in July. Flight prices, which tend to average around £0, are often lower during this time because this is during the off-season. If you aren’t able to travel to Belfast during the month of July, then flying in January is also cheap. Prices for this month can be found on momondo for an average of £0.

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

14h 25m

Direct flights

None
The fastest flight from Seattle to Belfast takes 14h 25m
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?

    Seattle/Tacoma Intl and Belfast are 4463.0 mi apart from one another. 14h 25m is a normal flight duration for this route.

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 you'll need for your trip to Belfast may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Belfast. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Why use momondo?

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

Finding the right flight to Belfast from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Belfast quick and easy, saving you time and money.

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 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?

If you are simply researching potential flights to Belfast, momondo offers a useful price alert feature which will track prices for flights to Belfast from Seattle and alert you when they change.

An easier way to manage your Belfast trip

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