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Cheap flights from Washington to Belfast from $284

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Belfast departing on 8/23. 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
1 adult, Economy, 0 bags

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Find the cheapest flights from Washington to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:00 pm - 9:05 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
18h 05m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
8:20 am - 8:40 pmBFS  Belfast Intl-SEA Seattle/Tacoma Intl
20h 20m2 stops London Gatwick Reykjavik Keflavik Intl
$907Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
British Airways Logo
6:45 pm - 6:40 pmSEA  Seattle/Tacoma Intl-BHD Belfast City
15h 55m1 stop London Heathrow
British Airways Logo
9:15 am - 4:50 pmBHD  Belfast City-SEA Seattle/Tacoma Intl
15h 35m1 stop London Heathrow
$908British Airways
Sun, Nov 15 - Wed, Nov 18
British Airways Logo
5:45 pm - 4:50 pmPDX  Portland-BHD Belfast City
15h 05m1 stop London Heathrow
British Airways Logo
4:55 pm - 3:50 pmBHD  Belfast City-PDX Portland
30h 55m1 stop London Heathrow
$917British Airways
Sun, Jan 31 - Tue, Feb 2
British Airways Logo
8:20 pm - 7:25 pmSEA  Seattle/Tacoma Intl-BHD Belfast City
15h 05m1 stop London Heathrow
British Airways Logo
12:45 pm - 6:25 pmBHD  Belfast City-SEA Seattle/Tacoma Intl
13h 40m1 stop London Heathrow
$946British Airways
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
1:30 pm - 12:55 pmSEA  Seattle/Tacoma Intl-BHD Belfast City
15h 25m1 stop London Heathrow
British Airways Logo
12:45 pm - 6:25 pmBHD  Belfast City-SEA Seattle/Tacoma Intl
13h 40m1 stop London Heathrow
$946British Airways
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
8:20 pm - 7:25 pmSEA  Seattle/Tacoma Intl-BHD Belfast City
15h 05m1 stop London Heathrow
British Airways Logo
12:45 pm - 6:25 pmBHD  Belfast City-SEA Seattle/Tacoma Intl
13h 40m1 stop London Heathrow
$955British Airways
Mon, Oct 5 - Thu, Oct 22
Multiple Airlines Logo
7:00 pm - 11:20 pmSEA  Seattle/Tacoma Intl-BFS Belfast Intl
20h 20m3 stops Reykjavik Keflavik Intl Glasgow Intl London Luton
Multiple Airlines Logo
6:15 am - 8:40 pmBFS  Belfast Intl-SEA Seattle/Tacoma Intl
22h 25m2 stops London Gatwick Reykjavik Keflavik Intl
$958Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
American Airlines Logo
3:14 pm - 3:30 pmSEA  Seattle/Tacoma Intl-BHD Belfast City
16h 16m2 stops Chicago O'Hare Intl London Heathrow
American Airlines Logo
2:20 pm - 11:35 amBHD  Belfast City-SEA Seattle/Tacoma Intl
29h 15m1 stop London Heathrow
$971American Airlines
Mon, Oct 5 - Thu, Oct 22
American Airlines Logo
10:31 am - 12:55 pmSEA  Seattle/Tacoma Intl-BHD Belfast City
18h 24m2 stops Chicago O'Hare Intl London Heathrow
American Airlines Logo
2:20 pm - 11:35 amBHD  Belfast City-SEA Seattle/Tacoma Intl
29h 15m1 stop London Heathrow
$971American Airlines
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
10:31 am - 3:30 pmSEA  Seattle/Tacoma Intl-BHD Belfast City
20h 59m2 stops Chicago O'Hare Intl London Heathrow
British Airways Logo
9:35 am - 8:15 pmBHD  Belfast City-SEA Seattle/Tacoma Intl
18h 40m2 stops London Heathrow Chicago O'Hare Intl
$982British Airways
Mon, Oct 5 - Thu, Oct 22

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British Airways flights from State of Washington to Belfast

Our best British Airways deals on State of Washington to Belfast flight tickets
British Airways
Nov 15
SEA6:45 pmSeattle/Tacoma Intl
15h 55m
1 stop
BHD6:40 pmBelfast City
Nov 18
BHD9:15 amBelfast City
15h 35m
1 stop
SEA4:50 pmSeattle/Tacoma Intl
$908
British Airways
Jan 31
PDX5:45 pmPortland
15h 05m
1 stop
BHD4:50 pmBelfast City
Feb 2
BHD4:55 pmBelfast City
30h 55m
1 stop
PDX3:50 pmPortland
$917
British Airways
Oct 5
SEA8:20 pmSeattle/Tacoma Intl
15h 05m
1 stop
BHD7:25 pmBelfast City
Oct 22
BHD12:45 pmBelfast City
13h 40m
1 stop
SEA6:25 pmSeattle/Tacoma Intl
$946

American Airlines flights from State of Washington to Belfast

Our best American Airlines deals on State of Washington to Belfast flight tickets
American Airlines
Oct 5
SEA3:14 pmSeattle/Tacoma Intl
16h 16m
2 stops
BHD3:30 pmBelfast City
Oct 22
BHD2:20 pmBelfast City
29h 15m
1 stop
SEA11:35 amSeattle/Tacoma Intl
$971
American Airlines
Jan 29
PDX1:12 pmPortland
17h 03m
2 stops
BHD2:15 pmBelfast City
Feb 7
BHD6:30 amBelfast City
17h 20m
1 stop
PDX3:50 pmPortland
$1,020
American Airlines
Sep 6
SEA8:20 pmSeattle/Tacoma Intl
13h 20m
1 stop
BHD5:40 pmBelfast City
Sep 13
BHD11:00 amBelfast City
18h 36m
2 stops
SEA9:36 pmSeattle/Tacoma Intl
$1,026

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington 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 August 11, 2026.
Use the filters below to find and compare flights from Washington to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Tue 9/22

7:00 pm-9:05 pm

2 stops18h 05m

Belfast Intl

Tue 9/29

8:20 am-8:40 pm

2 stops20h 20m

$907

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Sun 11/15

6:45 pm-6:40 pm

1 stop15h 55m

Belfast City

Wed 11/18

9:15 am-4:50 pm

1 stop15h 35m

$908

PortlandBelfast

PDX Portland - BHD Belfast City

PDXBHD

Portland

Sun 1/31

5:45 pm-4:50 pm

1 stop15h 05m

Belfast City

Tue 2/2

4:55 pm-3:50 pm

1 stop30h 55m

$917
Quickest round-trip

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 10/5

8:20 pm-7:25 pm

1 stop15h 05m

Belfast City

Thu 10/22

12:45 pm-6:25 pm

1 stop13h 40m

$946

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 10/5

1:30 pm-12:55 pm

1 stop15h 25m

Belfast City

Thu 10/22

12:45 pm-6:25 pm

1 stop13h 40m

$946

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 10/5

8:20 pm-7:25 pm

1 stop15h 05m

Belfast City

Thu 10/22

12:45 pm-6:25 pm

1 stop13h 40m

$955

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Tue 9/22

7:00 pm-11:20 pm

3 stops20h 20m

Belfast Intl

Tue 9/29

6:15 am-8:40 pm

2 stops22h 25m

$958

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 10/5

3:14 pm-3:30 pm

2 stops16h 16m

Belfast City

Thu 10/22

2:20 pm-11:35 am

1 stop29h 15m

$971

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 10/5

10:31 am-12:55 pm

2 stops18h 24m

Belfast City

Thu 10/22

2:20 pm-11:35 am

1 stop29h 15m

$971

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 10/5

10:31 am-3:30 pm

2 stops20h 59m

Belfast City

Thu 10/22

9:35 am-8:15 pm

2 stops18h 40m

$982

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 State of Washington 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 airline that flies from Washington to Belfast?

British Airways and Delta are the most popular carriers operating from Washington to Belfast

Cheap State of Washington to Belfast flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Belfast

Fastest flight time

12h 30m

Direct flights

None
The fastest flight from State of Washington to Belfast takes 12h 30m
There are no direct flights from State of Washington to Belfast. There are no popular flight routes from State of Washington to Belfast.
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Frequently asked questions about flying from Washington to Belfast

  • When did momondo last update prices for flights from Washington to Belfast?

    Prices for flights from Washington to Belfast are refreshed on a daily basis.

  • How many operators does momondo search for flights from Washington to Belfast?

  • How old do you have to be to fly from Washington 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 Washington to Belfast.

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

    The necessary travel and health documents for your Belfast trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from State of Washington to Belfast

Compare and see reviews for airlines that fly from State of Washington to Belfast with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $822Free CancellationRating
6.7
8,157 reviews
Search British Airways flights

Why use momondo?

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

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

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

Yes. momondo allows you to filter the results for Washington to Belfast flights to just show those with flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Belfast from Washington.

I’m not ready to book a flight from Washington 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 Washington and alert you when they change.

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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