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Cheap flights from Washington to Belfast Intl Airport from £229

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 — BFS
29 Jun — 6 Jul1
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 30 May 2026.

Mon 17/815:40
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Tue 25/820:15
BFS
-
SEA
3 stops47h 30m
Multiple Airlines
Deal found 27/5£690
Mon 17/815:40
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Mon 24/806:10
BFS
-
SEA
2 stops22h 30m
Multiple Airlines
Deal found 27/5£704
Sun 19/715:40
SEA
-
BFS
2 stops23h 15m
Multiple Airlines
Tue 4/808:00
BFS
-
SEA
2 stops35h 45m
Multiple Airlines
Deal found 27/5£709
Mon 31/819:00
SEA
-
BFS
2 stops17h 40m
Multiple Airlines
Mon 7/909:15
BFS
-
SEA
2 stops34h 30m
Multiple Airlines
Deal found 25/5£721
Sat 12/915:40
SEA
-
BFS
2 stops23h 45m
Multiple Airlines
Sun 20/922:00
BFS
-
SEA
3 stops27h 55m
Multiple Airlines
Deal found 27/5£744
Tue 1/919:00
SEA
-
BFS
2 stops18h 05m
Multiple Airlines
Tue 15/920:15
BFS
-
SEA
3 stops29h 40m
Multiple Airlines
Deal found 27/5£745
Wed 28/1007:00
PDX
-
BFS
3 stops30h 20m
Multiple Airlines
Sat 7/1119:35
BFS
-
PDX
2 stops29h 25m
Multiple Airlines
Deal found 27/5£832
Fri 7/810:10
PDX
-
BFS
3 stops27h 05m
Multiple Airlines
Thu 13/806:40
BFS
-
PDX
3 stops34h 51m
Multiple Airlines
Deal found 27/5£908
Sat 11/715:30
PDX
-
BFS
2 stops21h 10m
Multiple Airlines
Sat 18/722:25
BFS
-
PDX
3 stops47h 25m
Multiple Airlines
Deal found 27/5£927
Wed 1/710:10
PDX
-
BFS
3 stops26h 25m
Multiple Airlines
Thu 9/708:20
BFS
-
PDX
3 stops37h 30m
Multiple Airlines
Deal found 29/5£947
Mon 1/615:30
PDX
-
BFS
2 stops20h 55m
Multiple Airlines
Wed 3/614:35
BFS
-
PDX
2 stops31h 00m
Multiple Airlines
Deal found 28/5£986
Sat 17/1015:30
PDX
-
BFS
3 stops23h 55m
Multiple Airlines
Sat 24/1020:15
BFS
-
PDX
3 stops29h 45m
Multiple Airlines
Deal found 28/5£1,081

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 30 May 2026.

Round-trip from

£690

One-way from

£229
17/8-25/8
  • 17/8-25/8
  • 6 total stops
  • 71h 10m total
  • Washington to Belfast
Search Deals
16/8
  • 16/8
  • 3 total stops
  • 29h 05m 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 30 May 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

Mon 17/8

19:00-22:25

2 stops19h 25m

Belfast Intl

Tue 25/8

08:20-11:45

2 stops35h 25m

£714

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 31/8

19:00-20:40

2 stops17h 40m

Belfast Intl

Mon 7/9

09:15-11:45

2 stops34h 30m

£721

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 12/9

15:40-23:25

2 stops23h 45m

Belfast Intl

Sun 20/9

22:00-17:55

3 stops27h 55m

£744
Fastest return journey

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 1/9

19:00-21:05

2 stops18h 05m

Belfast Intl

Tue 15/9

20:15-17:55

3 stops29h 40m

£745

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Wed 28/10

07:00-20:20

3 stops30h 20m

Belfast Intl

Sat 7/11

19:35-17:00

2 stops29h 25m

£832

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 1/7

19:10-21:05

2 stops17h 55m

Belfast Intl

Wed 29/7

05:55-17:20

3 stops43h 25m

£947

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Wed 1/7

10:10-20:35

3 stops26h 25m

Belfast Intl

Thu 9/7

08:20-13:50

3 stops37h 30m

£947

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sat 17/10

15:30-23:25

3 stops23h 55m

Belfast Intl

Sat 24/10

20:15-18:00

3 stops29h 45m

£1,081

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Fri 10/7

10:10-21:15

3 stops27h 05m

Belfast Intl

Sat 18/7

21:40-17:55

2 stops28h 15m

£1,126

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Fri 7/8

14:30-14:25

2 stops15h 55m

Belfast Intl

Thu 13/8

06:40-09:31

3 stops34h 51m

£1,135

Flights are sorted by cheapest return flights first.

Deals found on 27/5

Showing 1-10 of 12 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
Ballymena
Dungannon

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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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