Find flights
When to book

Cheap flights from Washington to Belfast Intl Airport from £685

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 18/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
29 Jul — 5 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 29 June 2026.

Tue 18/819:00
SEA
-
BFS
3 stops20h 20m
Multiple Airlines
Tue 25/807:00
BFS
-
SEA
3 stops34h 40m
Multiple Airlines
Deal found 29/6£685
Sun 4/1021:45
SEA
-
BFS
1 stop30h 30m
Multiple Airlines
Sun 18/1019:35
BFS
-
SEA
2 stops29h 35m
Multiple Airlines
Deal found 28/6£688
Wed 16/915:30
PDX
-
BFS
2 stops17h 35m
Multiple Airlines
Wed 23/906:15
BFS
-
PDX
3 stops35h 16m
Multiple Airlines
Deal found 27/6£694
Fri 11/915:40
SEA
-
BFS
3 stops21h 05m
Multiple Airlines
Wed 16/920:15
BFS
-
SEA
3 stops32h 25m
Multiple Airlines
Deal found 28/6£748
Thu 3/915:30
PDX
-
BFS
2 stops23h 30m
Multiple Airlines
Sat 12/922:25
BFS
-
PDX
3 stops43h 06m
Multiple Airlines
Deal found 27/6£772
Mon 10/815:40
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Mon 17/806:30
BFS
-
SEA
3 stops35h 10m
Multiple Airlines
Deal found 26/6£803
Wed 12/819:05
PDX
-
BFS
3 stops19h 15m
Multiple Airlines
Fri 21/807:05
BFS
-
PDX
3 stops38h 45m
Multiple Airlines
Deal found 26/6£966
Sun 9/814:30
PDX
-
BFS
2 stops19h 55m
Multiple Airlines
Sun 16/821:25
BFS
-
PDX
3 stops44h 06m
Multiple Airlines
Deal found 26/6£982
Tue 11/815:30
PDX
-
BFS
2 stops22h 45m
Multiple Airlines
Fri 21/807:05
BFS
-
PDX
3 stops38h 45m
Multiple Airlines
Deal found 26/6£992

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 29 June 2026.

Round-trip from

£688
4/10-18/10
  • 4/10-18/10
  • 3 total stops
  • 60h 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 29 June 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

Tue 18/8

19:00-23:20

3 stops20h 20m

Belfast Intl

Tue 25/8

07:00-09:40

3 stops34h 40m

£685

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Wed 16/9

15:30-17:05

2 stops17h 35m

Belfast Intl

Wed 23/9

06:15-09:31

3 stops35h 16m

£694

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 4/10

21:45-12:15

1 stop30h 30m

Belfast Intl

Sun 18/10

19:35-18:55

1 stop31h 20m

£726

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Thu 3/9

15:30-23:00

2 stops23h 30m

Belfast Intl

Sat 12/9

22:25-09:31

3 stops43h 06m

£772
Fastest return journey

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 11/9

19:00-21:50

2 stops18h 50m

Belfast Intl

Wed 16/9

20:15-20:40

3 stops32h 25m

£801

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 10/8

15:40-23:20

3 stops23h 40m

Belfast Intl

Mon 17/8

06:30-09:40

3 stops35h 10m

£803

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sun 9/8

14:30-18:25

2 stops19h 55m

Belfast Intl

Sun 16/8

21:25-09:31

3 stops44h 06m

£982

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Tue 11/8

15:30-22:15

2 stops22h 45m

Belfast Intl

Fri 21/8

07:05-13:50

3 stops38h 45m

£1,007

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Wed 12/8

14:30-19:15

2 stops20h 45m

Belfast Intl

Fri 21/8

08:55-11:45

2 stops34h 50m

£1,200

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Fri 10/7

14:30-16:30

2 stops18h 00m

Belfast Intl

Mon 13/7

06:30-13:50

3 stops39h 20m

£1,293

Flights are sorted by cheapest return flights first.

Deals found on 29/6

Sorted by cheapest first

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Washington to Belfast Intl?

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?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Washington to Belfast Intl for you. Better yet — we are completely free to use.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.