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Cheap flights from Washington to Belfast from £227

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 16/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
8 Jul — 15 Jul1
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 8 June 2026.

Mon 5/1013:30
SEA
-
BHD
1 stop15h 25m
British Airways
Thu 22/1020:35
BHD
-
SEA
1 stop23h 00m
British Airways
Deal found 7/6£666
Sun 27/920:20
SEA
-
BHD
1 stop16h 15m
British Airways
Wed 30/918:20
BHD
-
SEA
1 stop25h 15m
British Airways
Deal found 7/6£681
Mon 5/1015:10
SEA
-
BHD
2 stops16h 20m
American Airlines
Thu 22/1006:30
BHD
-
SEA
1 stop13h 05m
American Airlines
Deal found 7/6£682
Wed 2/920:20
SEA
-
BHD
1 stop14h 25m
British Airways
Wed 9/920:35
BHD
-
SEA
1 stop23h 00m
British Airways
Deal found 6/6£709
Wed 28/1018:45
PDX
-
BHD
1 stop14h 50m
British Airways
Sat 7/1118:00
BHD
-
PDX
1 stop29h 55m
British Airways
Deal found 5/6£712
Sun 27/907:25
PDX
-
BHD
2 stops19h 05m
British Airways
Sat 3/1019:05
BHD
-
PDX
1 stop30h 35m
British Airways
Deal found 6/6£725
Sun 27/911:48
PDX
-
BHD
2 stops18h 47m
American Airlines
Sat 3/1007:05
BHD
-
PDX
2 stops20h 31m
American Airlines
Deal found 6/6£727
Wed 2/920:20
SEA
-
BHD
1 stop15h 30m
Multiple Airlines
Wed 9/911:35
BHD
-
SEA
2 stops20h 36m
Multiple Airlines
Deal found 6/6£733
Mon 20/720:20
SEA
-
BHD
1 stop13h 10m
American Airlines
Mon 27/709:40
BHD
-
SEA
1 stop33h 55m
American Airlines
Deal found 4/6£806
Sat 18/715:40
SEA
-
BFS
2 stops23h 00m
Multiple Airlines
Sat 25/708:30
BFS
-
SEA
3 stops33h 10m
Multiple Airlines
Deal found 4/6£820
Thu 23/715:40
SEA
-
BFS
3 stops22h 00m
Multiple Airlines
Thu 30/706:40
BFS
-
SEA
3 stops24h 02m
Multiple Airlines
Deal found 8/6£831
Sun 6/1218:50
SEA
-
BHD
1 stop15h 50m
British Airways
Wed 9/1206:35
BHD
-
SEA
2 stops19h 45m
British Airways
Deal found 3/6£837

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 8 June 2026.

Round-trip from

£666

One-way from

£227
British Airways
  • British Airways
  • 5/10-22/10
  • 2 total stops
  • 38h 25m total
  • Washington to Belfast
Search Deals
16/8
  • 16/8
  • 3 total stops
  • 32h 25m 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 8 June 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 - BHD

SEABHD

Seattle/Tacoma Intl

Sun 6/9

20:20-17:40

1 stop13h 20m

Belfast City

Thu 10/9

19:30-11:35

1 stop24h 05m

£681

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 27/9

20:20-20:35

1 stop16h 15m

Belfast City

Wed 30/9

06:30-11:35

1 stop13h 05m

£681

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 28/10

13:30-16:35

2 stops20h 05m

Belfast City

Sat 7/11

18:00-15:55

1 stop29h 55m

£723

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sun 27/9

07:25-10:30

2 stops19h 05m

Belfast City

Sat 3/10

19:05-17:40

1 stop30h 35m

£725

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sun 27/9

11:48-14:35

2 stops18h 47m

Belfast City

Sat 3/10

07:05-19:36

2 stops20h 31m

£727

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 20/7

20:20-17:30

1 stop13h 10m

Belfast City

Mon 27/7

09:40-11:35

1 stop33h 55m

£806

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 18/7

15:40-22:40

2 stops23h 00m

Belfast Intl

Sat 25/7

08:30-09:40

3 stops33h 10m

£820

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 23/7

15:40-21:40

3 stops22h 00m

Belfast Intl

Thu 30/7

06:40-22:42

3 stops24h 02m

£831

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 1/7

19:10-22:20

2 stops19h 10m

Belfast Intl

Wed 8/7

05:55-21:00

3 stops47h 05m

£846

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sun 27/9

14:30-14:55

2 stops16h 25m

Belfast City

Sat 3/10

12:05-17:55

3 stops37h 50m

£1,489

Flights are sorted by cheapest return flights first.

Deals found on 4/6

Showing 1-10 of 18 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 and American Airlines fly from State of Washington to Belfast in about 13h 20m. The time it takes to get you to your destination can typically vary by up to 5h 27m. There are 4472 mi between State of Washington and Belfast. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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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