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Cheap flights from Washington to Belfast from £246

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 29/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
18 May — 25 May1
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 18 April 2026.

Mon 5/1020:20
SEA
-
BHD
1 stop14h 25m
British Airways
Thu 22/1006:30
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 13/4£656
Sun 15/1118:50
SEA
-
BHD
1 stop14h 00m
British Airways
Wed 18/1119:25
BHD
-
SEA
1 stop24h 05m
British Airways
Deal found 13/4£670
Sun 27/913:30
SEA
-
BHD
1 stop13h 00m
British Airways
Wed 30/920:35
BHD
-
SEA
1 stop29h 50m
British Airways
Deal found 15/4£671
Wed 9/913:30
SEA
-
BHD
1 stop14h 30m
British Airways
Tue 15/920:25
BHD
-
SEA
1 stop23h 10m
British Airways
Deal found 16/4£679
Wed 28/1018:45
PDX
-
BHD
1 stop12h 30m
British Airways
Mon 9/1106:35
BHD
-
PDX
1 stop17h 20m
British Airways
Deal found 15/4£692
Sun 20/919:30
PDX
-
BHD
1 stop15h 15m
British Airways
Sat 3/1016:15
BHD
-
PDX
1 stop33h 25m
British Airways
Deal found 17/4£706
Sun 1/1115:40
PDX
-
BHD
2 stops19h 00m
Multiple Airlines
Sun 8/1109:10
BHD
-
PDX
1 stop14h 45m
Multiple Airlines
Deal found 16/4£711
Wed 28/1006:35
PDX
-
BHD
2 stops20h 40m
Multiple Airlines
Mon 9/1109:15
BHD
-
PDX
1 stop14h 40m
Multiple Airlines
Deal found 15/4£712
Sun 20/919:30
PDX
-
BHD
1 stop15h 15m
Multiple Airlines
Sat 3/1007:05
BHD
-
PDX
2 stops22h 52m
Multiple Airlines
Deal found 17/4£722
Wed 28/1013:28
PDX
-
BHD
2 stops20h 07m
American Airlines
Mon 9/1106:35
BHD
-
PDX
2 stops20h 40m
American Airlines
Deal found 16/4£723
Sat 19/912:32
PDX
-
BHD
2 stops37h 58m
British Airways
Sat 3/1019:05
BHD
-
PDX
1 stop30h 35m
British Airways
Deal found 17/4£742
Wed 9/915:40
SEA
-
BFS
2 stops17h 25m
Multiple Airlines
Tue 15/920:15
BFS
-
SEA
3 stops29h 40m
Multiple Airlines
Deal found 16/4£743

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 18 April 2026.

Round-trip from

£656

One-way from

£246

Popular in

December

Cheapest in

October

Average price

£797
British Airways
  • British Airways
  • 5/10-22/10
  • 2 total stops
  • 27h 30m total
  • Washington to Belfast
Search Deals
British Airways
  • British Airways
  • 27/9
  • 1 total stop
  • 14h 25m total
  • Washington to Belfast
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£82 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£33 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
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 18 April 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
Fastest return journey

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

20:20-18:45

1 stop14h 25m

Belfast City

Thu 22/10

06:30-11:35

1 stop13h 05m

£656

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 27/9

13:30-10:30

1 stop13h 00m

Belfast City

Wed 30/9

20:35-18:25

1 stop29h 50m

£671

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sun 20/9

19:30-18:45

1 stop15h 15m

Belfast City

Sat 3/10

16:15-17:40

1 stop33h 25m

£706

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sun 20/9

19:30-18:45

1 stop15h 15m

Belfast City

Sat 3/10

07:05-21:57

2 stops22h 52m

£722

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 14/9

13:24-18:45

2 stops21h 21m

Belfast City

Fri 18/9

20:10-11:35

1 stop23h 25m

£732

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sat 19/9

12:32-10:30

2 stops37h 58m

Belfast City

Sat 3/10

19:05-17:40

1 stop30h 35m

£742

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 20/8

15:40-19:20

2 stops19h 40m

Belfast Intl

Tue 25/8

20:10-11:45

3 stops47h 35m

£770

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sun 31/5

14:30-20:55

2 stops22h 25m

Belfast Intl

Sun 7/6

22:05-11:45

3 stops45h 40m

£771

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/6

13:30-12:00

1 stop14h 30m

Belfast City

Wed 10/6

19:40-11:35

1 stop23h 55m

£788

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 12/9

08:00-16:35

2 stops24h 35m

Belfast Intl

Sat 19/9

06:20-20:40

2 stops22h 20m

£802

Flights are sorted by cheapest return flights first.

Deals found on 14/4

Showing 1-10 of 33 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

How much does it cost for a return flight 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?

    Airlines like British Airways and Delta 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 45m. 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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