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Cheap flights from Washington to Belfast from £173

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 17/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
21 Aug — 28 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Washington to Belfast

Enter your travel dates to find the best prices.

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 22 July 2026.

Wed 26/815:40
SEA
-
BFS
3 stops23h 35m
Multiple Airlines
Sat 29/821:15
BFS
-
SEA
3 stops44h 25m
Multiple Airlines
Deal found 18/7£647
Tue 25/819:00
SEA
-
BFS
2 stops19h 15m
Multiple Airlines
Sat 29/821:15
BFS
-
SEA
3 stops44h 25m
Multiple Airlines
Deal found 18/7£674
Mon 5/1013:30
SEA
-
BHD
1 stop15h 25m
British Airways
Thu 22/1012:45
BHD
-
SEA
1 stop13h 40m
British Airways
Deal found 22/7£707
Wed 2/913:30
SEA
-
BHD
1 stop16h 05m
British Airways
Tue 8/916:25
BHD
-
SEA
1 stop27h 10m
British Airways
Deal found 19/7£724
Tue 18/815:30
PDX
-
BFS
2 stops22h 45m
Multiple Airlines
Mon 24/820:35
BFS
-
PDX
3 stops44h 56m
Multiple Airlines
Deal found 20/7£725
Wed 2/908:10
SEA
-
BHD
2 stops21h 25m
British Airways
Mon 7/918:30
BHD
-
SEA
1 stop25h 05m
British Airways
Deal found 19/7£732
Thu 3/920:20
SEA
-
BHD
1 stop16h 15m
British Airways
Mon 7/919:35
BHD
-
SEA
1 stop24h 00m
British Airways
Deal found 19/7£744
Tue 1/920:20
SEA
-
BHD
1 stop16h 15m
British Airways
Tue 8/913:45
BHD
-
SEA
1 stop29h 50m
British Airways
Deal found 19/7£758
Fri 4/920:20
SEA
-
BHD
1 stop16h 15m
British Airways
Wed 9/911:35
BHD
-
SEA
1 stop32h 00m
British Airways
Deal found 19/7£762
Sat 5/919:00
SEA
-
BFS
2 stops18h 30m
Multiple Airlines
Wed 9/908:55
BFS
-
SEA
1 stop18h 05m
Multiple Airlines
Deal found 19/7£776
Fri 4/915:40
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Fri 11/906:05
BFS
-
SEA
2 stops22h 35m
Multiple Airlines
Deal found 21/7£786
Tue 18/805:50
SEA
-
BFS
3 stops25h 25m
Multiple Airlines
Mon 24/820:35
BFS
-
SEA
3 stops45h 05m
Multiple Airlines
Deal found 20/7£793

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 22 July 2026.

Round-trip from

£647

One-way from

£173
26/8-29/8
  • 26/8-29/8
  • 6 total stops
  • 68h 00m total
  • Washington to Belfast
Search Deals
17/11
  • 17/11
  • 3 total stops
  • 23h 57m total
  • Washington to Belfast
Search Deals

Cheapflights Fare Finder

 
Customise 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 858,174 searches. Data last updated 22 July 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 return flight

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 26/8

15:40-23:15

3 stops23h 35m

Belfast Intl

Sat 29/8

21:15-09:40

3 stops44h 25m

£647
Fastest return journey

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 17/1

18:45-16:50

1 stop14h 05m

Belfast City

Thu 21/1

11:05-16:50

1 stop13h 45m

£685

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 10/1

18:45-18:40

1 stop15h 55m

Belfast City

Thu 14/1

09:05-16:50

1 stop15h 45m

£685

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 25/8

19:00-22:25

3 stops19h 25m

Belfast Intl

Sat 29/8

21:15-09:40

3 stops44h 25m

£692

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

20:20-19:25

1 stop15h 05m

Belfast City

Thu 22/10

12:45-18:25

1 stop13h 40m

£707

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Tue 18/8

15:30-22:15

2 stops22h 45m

Belfast Intl

Mon 24/8

20:35-09:31

3 stops44h 56m

£725

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 5/9

19:00-21:30

2 stops18h 30m

Belfast Intl

Wed 9/9

08:55-19:00

1 stop18h 05m

£776

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 4/9

15:40-23:20

3 stops23h 40m

Belfast Intl

Fri 11/9

06:05-20:40

2 stops22h 35m

£786

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 18/8

05:50-15:15

3 stops25h 25m

Belfast Intl

Mon 24/8

20:35-09:40

3 stops45h 05m

£793

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 1/9

07:15-09:20

2 stops18h 05m

Belfast City

Mon 7/9

17:30-11:47

1 stop26h 17m

£813

Flights are sorted by cheapest return flights first.

Deals found on 21/7

Showing 1-10 of 25 resultsSorted by cheapest first
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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 return 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

No data available for this route at this time. Please check back soon.

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?

    Airlines like British Airways fly from State of Washington to Belfast in about 14h 05m. The time it takes to get you to your destination can typically vary by up to . There are 4472 mi between State of Washington and Belfast.

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

    When deciding which route to take from State of Washington to Belfast consider Seattle/Tacoma Intl - Belfast Intl, Seattle/Tacoma Intl - Belfast City or Portland - Belfast Intl as they are the most popular.

  • 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 holiday 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

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How does Cheapflights help users find flights from Washington to Belfast?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Washington to Belfast. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Washington to Belfast?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Belfast from Washington.

Can Cheapflights find flights from Washington to Belfast with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Washington to Belfast, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Washington to Belfast become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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