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Cheap flights from Washington to Belfast Intl Airport from £242

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

Cheap flight deals from Washington to Belfast Intl

Enter your travel dates to find the best prices.

Cheapest flights from Washington to Belfast Intl
Explore the most affordable flight options available from Washington to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 July 2026.

Sun 23/815:40
SEA
-
BFS
2 stops21h 50m
Multiple Airlines
Sun 30/806:45
BFS
-
SEA
3 stops34h 55m
Multiple Airlines
Deal found 9/7£662
Wed 9/915:40
SEA
-
BFS
2 stops17h 25m
Multiple Airlines
Wed 23/920:15
BFS
-
SEA
3 stops32h 25m
Multiple Airlines
Deal found 6/7£666
Fri 21/819:00
SEA
-
BFS
2 stops18h 50m
Multiple Airlines
Fri 28/807:20
BFS
-
SEA
3 stops43h 25m
Multiple Airlines
Deal found 9/7£729
Sun 9/821:45
SEA
-
BFS
1 stop30h 30m
Multiple Airlines
Mon 24/820:35
BFS
-
SEA
2 stops57h 25m
Multiple Airlines
Deal found 9/7£734
Mon 19/1015:30
PDX
-
BFS
2 stops16h 45m
Multiple Airlines
Mon 26/1006:20
BFS
-
PDX
2 stops18h 40m
Multiple Airlines
Deal found 7/7£938
Fri 21/819:00
PDX
-
BFS
3 stops18h 15m
Multiple Airlines
Fri 28/818:35
BFS
-
PDX
2 stops26h 30m
Multiple Airlines
Deal found 10/7£973
Sat 8/815:10
PDX
-
BFS
2 stops23h 05m
Multiple Airlines
Fri 14/807:20
BFS
-
PDX
3 stops38h 30m
Multiple Airlines
Deal found 9/7£1,114
Tue 21/714:30
PDX
-
BFS
2 stops25h 35m
Multiple Airlines
Fri 24/707:20
BFS
-
PDX
3 stops38h 30m
Multiple Airlines
Deal found 7/7£1,272

Find flight deals from Washington to Belfast Intl

Keep the following information in mind while searching for Washington to Belfast Intl flight deals. Data was last updated 11 July 2026.

Round-trip from

£662

One-way from

£242
23/8-30/8
  • 23/8-30/8
  • 5 total stops
  • 56h 45m total
  • Washington to Belfast
Search Deals
1/11
  • 1/11
  • 2 total stops
  • 18h 30m total
  • Washington to Belfast
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Washington to Belfast Intl 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 11 July 2026.
Use the filters below to find and compare flights from Washington to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 23/8

15:40-21:30

2 stops21h 50m

Belfast Intl

Sun 30/8

06:45-09:40

3 stops34h 55m

£662

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 21/8

19:00-21:50

2 stops18h 50m

Belfast Intl

Fri 28/8

07:20-18:45

3 stops43h 25m

£729

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 9/8

21:45-12:15

1 stop30h 30m

Belfast Intl

Mon 24/8

20:35-22:00

2 stops57h 25m

£734

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 9/9

21:40-10:40

1 stop29h 00m

Belfast Intl

Wed 23/9

20:15-19:00

1 stop30h 45m

£756

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 16/8

15:40-21:30

3 stops21h 50m

Belfast Intl

Tue 1/9

08:20-20:40

2 stops20h 20m

£785

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 7/8

05:50-16:30

3 stops26h 40m

Belfast Intl

Wed 9/9

05:55-22:42

3 stops24h 47m

£800
Fastest return journey

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Mon 19/10

15:30-16:15

2 stops16h 45m

Belfast Intl

Mon 26/10

06:20-18:00

2 stops18h 40m

£938

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Fri 21/8

19:00-21:15

3 stops18h 15m

Belfast Intl

Fri 28/8

18:35-13:05

2 stops26h 30m

£973

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sat 8/8

15:10-22:15

2 stops23h 05m

Belfast Intl

Fri 14/8

07:20-13:50

3 stops38h 30m

£1,114

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Tue 21/7

14:30-00:05

2 stops25h 35m

Belfast Intl

Fri 24/7

18:35-13:05

2 stops26h 30m

£1,632

Flights are sorted by cheapest return flights first.

Deals found on 8/7

Showing 1-10 of 11 resultsSorted by cheapest first
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Best time to book a flight from Washington to Belfast Intl

Have a flexible travel schedule? Discover the best time to fly to Belfast Intl 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 Intl Airport
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 Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

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

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

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

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

Travelling to a place near Belfast Intl Airport?

Book flights to Belfast Intl Airport if you plan to visit one of these locations
Armagh
Newry

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Deals for Washington to Belfast Intl flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Washington to Belfast Intl flexibly with Cheapflights today.

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

Yes, Cheapflights offers price alerts on Washington to Belfast Intl flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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