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Cheap flights from Belfast Intl Airport to Washington from £423

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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
28 Feb — 7 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Belfast Intl to Washington

Enter your travel dates to find the best prices.

Cheapest flights from Belfast Intl to Washington
Explore the most affordable flight options available from Belfast Intl to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 January 2026.

Thu 29/109:55
BFS
-
SEA
3 stops20h 11m
Multiple Airlines
Fri 6/214:35
SEA
-
BFS
3 stops24h 10m
Multiple Airlines
Deal found 27/1£860
Fri 13/306:30
BFS
-
SEA
2 stops22h 46m
Multiple Airlines
Fri 20/316:10
SEA
-
BFS
2 stops22h 50m
Multiple Airlines
Deal found 27/1£873

Find flight deals from Belfast Intl to Washington

Keep the following information in mind while searching for Belfast Intl to Washington flight deals. Data was last updated 29 January 2026.

Round-trip from

£873

One-way from

£423
13/3-20/3
  • 13/3-20/3
  • 4 total stops
  • 45h 36m total
  • Belfast to Washington
Search Deals
7/2
  • 7/2
  • 3 total stops
  • 52h 45m total
  • Belfast to Washington
Search Deals

Cheapflights Fare Finder

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

Fly from

Belfast Intl

Fly to

Washington

Route

Depart

Return

Price

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 13/3

06:30-22:16

2 stops22h 46m

Seattle/Tacoma Intl

Fri 20/3

16:10-22:00

2 stops22h 50m

£873

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 7/2

23:10-19:55

3 stops52h 45m

£423

Flights are sorted by cheapest return flights first.

Deals found on 28/1

Best time to book a flight from Belfast Intl to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Belfast Intl 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 Belfast Intl Airport to Washington
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated 29 January 2026.
Read reviews from past customers who have flown with American Airlines and British Airways from Belfast Intl Airport to Washington. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,206 reviews
Check prices

Boarding

7.5

Overall

7.2

Food

6.4

Crew

8.0

Comfort

7.2

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.
American Airlines
7.2
Good
11,206 reviews
American Airlines
7.2
Good
11,206 reviews
Check prices

Boarding

7.5

Overall

7.2

Food

6.4

Crew

8.0

Comfort

7.2

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.
British Airways
6.7
Okay
7,705 reviews
American Airlines
7.2
Good
11,206 reviews
Check prices

Boarding

7.5

Overall

7.2

Food

6.4

Crew

8.0

Comfort

7.2

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Susie,Jan 2026

CLT - TPA

This flight was delayed 3 or 4 times. We had boarded the plane, sat on plane for a good 30 minutes, then we had to board the aircraft, walk to a different gate, wait and then board another aircraft. We arrived in Tampa 4 hours later than the original booking. I feel there should have been some sort of compensation especially for the advantage members.

Related info for your journey

Find useful and relevant information for your journey from Belfast Intl to Washington. 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 Belfast Intl to Washington that include hotel bookings?

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

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

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

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

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

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Alternative routes for Belfast Intl to Washington

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Top 2 airlines flying from Belfast Intl to Washington

Discover the top 2 airlines that operate flights from Belfast Intl to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 29 January 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£424Average£691FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£544Average£544FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

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