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Cheap flights from Washington to Belfast from £557

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 20/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
31 Mar — 7 Apr1
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 1 March 2026.

Mon 20/415:40
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Wed 29/406:10
BFS
-
SEA
2 stops22h 30m
Multiple Airlines
Deal found 27/2£557
Mon 20/420:20
SEA
-
BHD
1 stop16h 15m
British Airways
Wed 29/406:30
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 27/2£561
Fri 21/815:40
SEA
-
BHD
2 stops20h 55m
Multiple Airlines
Fri 28/809:35
BHD
-
SEA
2 stops34h 10m
Multiple Airlines
Deal found 28/2£571
Thu 3/920:20
SEA
-
BHD
1 stop16h 15m
British Airways
Fri 11/906:30
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 28/2£575
Wed 20/513:35
SEA
-
BHD
1 stop16h 00m
British Airways
Mon 25/519:35
BHD
-
SEA
1 stop24h 00m
British Airways
Deal found 26/2£577
Tue 14/415:40
SEA
-
BFS
2 stops21h 15m
Multiple Airlines
Tue 21/406:15
BFS
-
SEA
2 stops22h 25m
Multiple Airlines
Deal found 28/2£577
Mon 20/415:17
SEA
-
BHD
2 stops16h 13m
American Airlines
Wed 29/411:35
BHD
-
SEA
2 stops19h 03m
American Airlines
Deal found 27/2£580
Thu 3/915:40
SEA
-
BHD
2 stops20h 55m
Multiple Airlines
Fri 11/906:30
BHD
-
SEA
2 stops37h 15m
Multiple Airlines
Deal found 28/2£582
Sat 5/913:32
SEA
-
BHD
2 stops20h 43m
British Airways
Thu 17/906:30
BHD
-
SEA
2 stops24h 21m
British Airways
Deal found 27/2£583
Tue 18/806:10
SEA
-
BHD
2 stops20h 35m
British Airways
Sat 29/807:05
BHD
-
SEA
2 stops23h 53m
British Airways
Deal found 28/2£586
Fri 21/820:20
SEA
-
BHD
1 stop16h 15m
British Airways
Fri 28/809:35
BHD
-
SEA
2 stops18h 27m
British Airways
Deal found 28/2£592
Thu 3/919:00
SEA
-
BFS
2 stops17h 35m
Multiple Airlines
Fri 11/908:30
BFS
-
SEA
2 stops20h 10m
Multiple Airlines
Deal found 28/2£621

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 1 March 2026.

Round-trip from

£553

One-way from

£245
Delta
  • Delta
  • 25/3-1/4
  • 3 total stops
  • 52h 30m total
  • Washington to Belfast
Search Deals
11/4
  • 11/4
  • 3 total stops
  • 56h 10m 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 1 March 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

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 20/4

20:20-20:35

1 stop16h 15m

Belfast City

Wed 29/4

06:30-11:35

1 stop13h 05m

£561

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 20/4

15:40-15:35

2 stops15h 55m

Belfast Intl

Wed 29/4

06:10-20:40

2 stops22h 30m

£591

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 18/8

20:20-19:40

1 stop15h 20m

Belfast City

Sat 29/8

09:35-21:38

2 stops20h 03m

£597

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 20/5

13:35-13:35

1 stop16h 00m

Belfast City

Mon 25/5

19:35-23:39

2 stops36h 04m

£616

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 25/3

09:15-16:50

2 stops24h 35m

Belfast City

Wed 1/4

17:30-11:10

1 stop25h 40m

£621

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 12/4

19:00-21:00

2 stops18h 00m

Belfast Intl

Sun 19/4

20:20-20:40

3 stops32h 20m

£633

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 20/5

13:05-09:20

1 stop12h 15m

Belfast City

Mon 25/5

17:30-11:10

1 stop25h 40m

£654

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Thu 14/5

13:05-09:20

1 stop12h 15m

Belfast City

Sun 24/5

17:30-11:10

1 stop25h 40m

£656

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 6/8

13:35-10:10

1 stop12h 35m

Belfast City

Sat 15/8

09:35-21:38

2 stops20h 03m

£679

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 20/5

15:40-00:05

3 stops24h 25m

Belfast Intl

Mon 25/5

09:30-16:00

3 stops38h 30m

£690

Flights are sorted by cheapest return flights first.

Deals found on 27/2

Showing 1-10 of 24 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 Delta, British Airways, and Virgin Atlantic fly from State of Washington to Belfast in about 12h 15m. The time it takes to get you to your destination can typically vary by up to 14h 35m. There are 4585 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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