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$450+ Cheap flights from Washington to Belfast

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Washington to Belfast

Cheapest flights from Washington to Belfast
Explore the most affordable flight options available from Washington to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This oojo deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:50 pm
SEA
-
BHD
1 stop16h 50m
British Airways
Tue 3/178:45 am
BHD
-
SEA
1 stop16h 10m
British Airways
Deal found 1/27$624
This British Airways deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/46:50 pm
SEA
-
BHD
1 stop13h 45m
British Airways
Sun 3/88:25 pm
BHD
-
SEA
1 stop28h 30m
British Airways
Deal found 1/28$630
This KAYAK deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:50 pm
SEA
-
BHD
1 stop13h 55m
British Airways
Wed 3/185:40 pm
BHD
-
SEA
1 stop31h 15m
British Airways
Deal found 1/28$646
This oojo deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/31:29 pm
SEA
-
BHD
2 stops21h 16m
British Airways
Tue 5/126:30 am
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 1/27$648
This Air France deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/35:30 pm
SEA
-
BHD
1 stop15h 25m
Multiple Airlines
Tue 5/129:50 am
BHD
-
SEA
1 stop14h 40m
Multiple Airlines
Deal found 1/27$665
This British Airways deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/45:45 pm
PDX
-
BHD
1 stop29h 45m
British Airways
Sun 3/88:25 pm
BHD
-
PDX
1 stop27h 30m
British Airways
Deal found 1/26$689
This Trip.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/97:50 pm
SEA
-
BFS
2 stops16h 15m
Multiple Airlines
Sun 3/1510:10 pm
BFS
-
SEA
2 stops45h 20m
Multiple Airlines
Deal found 1/28$729
This British Airways deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:50 pm
SEA
-
BHD
1 stop13h 45m
British Airways
Sun 3/13:10 pm
BHD
-
SEA
1 stop33h 45m
British Airways
Deal found 1/28$733
This Ovago deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/157:30 pm
PDX
-
BHD
1 stop29h 15m
British Airways
Tue 7/219:40 am
BHD
-
PDX
2 stops19h 52m
British Airways
Deal found 1/28$989
This oojo deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/201:52 pm
PDX
-
BHD
2 stops20h 23m
British Airways
Sun 3/298:10 pm
BHD
-
PDX
2 stops31h 06m
British Airways
Deal found 1/27$1,224
This Booking.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/134:10 pm
SEA
-
BFS
3 stops23h 35m
Multiple Airlines
Fri 3/207:50 am
BFS
-
SEA
3 stops41h 15m
Multiple Airlines
Deal found 1/27$1,298
This Mytrip deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/132:25 pm
PDX
-
BFS
2 stops17h 45m
Multiple Airlines
Fri 3/206:30 am
BFS
-
PDX
2 stops18h 30m
Multiple Airlines
Deal found 1/27$1,389

Find flight deals from Washington to Belfast

Keep the following information in mind while searching for Washington to Belfast flight deals. Data was last updated January 29, 2026.

Round-trip from

$624
(oojo)

One-way from

$450
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$951
From Washington to Belfast
Search Deals
One-way flight from Washington to Belfast
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($121 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($60 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from 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, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from Washington to Belfast that are best for you.

Fly from

Washington

Fly to

Belfast

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-7:40 pm

1 stop16h 50m

Belfast City

Tue 3/17

8:45 am-5:55 pm

1 stop16h 10m

$624

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-7:40 pm

1 stop16h 50m

Belfast City

Wed 3/18

7:25 pm-5:55 pm

1 stop29h 30m

$624

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/4

6:50 pm-4:35 pm

1 stop13h 45m

Belfast City

Sun 3/8

3:10 pm-5:55 pm

1 stop33h 45m

$627

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 5/3

1:29 pm-6:45 pm

2 stops21h 16m

Belfast City

Tue 5/12

6:30 am-11:35 am

1 stop13h 05m

$648

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 3/4

5:45 pm-7:30 am

1 stop29h 45m

Belfast City

Sun 3/8

8:25 pm-4:55 pm

1 stop27h 30m

$689

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 3/9

7:50 pm-7:05 pm

2 stops16h 15m

Belfast Intl

Sun 3/15

10:10 pm-12:30 pm

2 stops45h 20m

$729

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 7/15

7:30 pm-8:45 am

1 stop29h 15m

Belfast City

Tue 7/21

9:40 am-9:32 pm

2 stops19h 52m

$989

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Fri 3/20

1:52 pm-5:15 pm

2 stops20h 23m

Belfast City

Sun 3/29

8:10 pm-7:16 pm

2 stops31h 06m

$1,224

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 3/13

3:00 pm-6:55 pm

2 stops20h 55m

Belfast Intl

Fri 3/20

11:45 am-1:10 pm

2 stops32h 25m

$1,346

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Fri 3/20

2:25 pm-4:50 pm

1 stop19h 25m

Belfast City

Sun 3/29

5:30 pm-11:10 am

1 stop25h 40m

$1,365

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 15 results
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Best time to book a flight from Washington to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from Washington with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington to Belfast

How much does it cost to fly round-trip from State of Washington to Belfast?

Related info for your journey

Find useful and relevant information for your journey from Washington to Belfast. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from State of Washington to Belfast?

    For as low as $624, British Airways can have you in Belfast from State of Washington in 16h 50m. There are 4472 mi between State of Washington and Belfast.

  • What are the most popular routes from State of Washington to Belfast?

    While some choose either Seattle/Tacoma Intl - Belfast City or Portland - Belfast Intl, Seattle/Tacoma Intl - Belfast Intl is the most popular route from State of Washington to Belfast.

  • Can I find deals for flights from Washington to Belfast that include hotel bookings?

    Yes. In addition to deals on Washington to Belfast flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Belfast?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Belfast.

  • Can I find deals for business class flights from Washington to Belfast?

    Yes. Cheapflights offers flight deals from Washington to Belfast by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Washington to Belfast

See prices for flight routes from nearby airports that may be better suited for you.
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