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Cheap flights from Belfast Intl Airport to Washington from £313

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 18/5. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
10 Mar — 17 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 8 February 2026.

Sun 22/306:30
BFS
-
SEA
3 stops34h 55m
Multiple Airlines
Sun 29/315:40
SEA
-
BFS
2 stops21h 20m
Multiple Airlines
Deal found 5/2£664
Wed 25/318:25
BFS
-
SEA
3 stops30h 35m
Multiple Airlines
Wed 1/415:40
SEA
-
BFS
2 stops16h 15m
Multiple Airlines
Deal found 8/2£702
Mon 23/312:40
BFS
-
SEA
2 stops31h 30m
Multiple Airlines
Mon 30/315:40
SEA
-
BFS
2 stops15h 55m
Multiple Airlines
Deal found 6/2£806
Mon 18/508:55
BFS
-
SEA
3 stops39h 05m
Multiple Airlines
Thu 28/505:40
SEA
-
BFS
3 stops29h 15m
Multiple Airlines
Deal found 6/2£828

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 8 February 2026.

Round-trip from

£664

One-way from

£313
22/3-29/3
  • 22/3-29/3
  • 5 total stops
  • 56h 15m total
  • Belfast to Washington
Search Deals
18/5
  • 18/5
  • 3 total stops
  • 41h 50m 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 8 February 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

Sun 22/3

06:30-10:25

3 stops34h 55m

Seattle/Tacoma Intl

Sun 29/3

15:40-21:00

2 stops21h 20m

£664

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 25/3

18:25-18:00

3 stops30h 35m

Seattle/Tacoma Intl

Wed 1/4

15:40-15:55

2 stops16h 15m

£702

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 23/3

12:40-13:10

2 stops31h 30m

Seattle/Tacoma Intl

Mon 30/3

15:40-15:35

2 stops15h 55m

£806

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 18/5

09:15-20:40

2 stops19h 25m

Seattle/Tacoma Intl

Thu 28/5

05:40-18:55

3 stops29h 15m

£828

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 18/5

06:10-16:00

3 stops41h 50m

£313

Flights are sorted by cheapest return flights first.

Deals found on 6/2

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 8 February 2026.
Read reviews from past customers who have flown with American Airlines 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
11,254 reviews
Check prices

Crew

8.0

Overall

7.2

Entertainment

6.9

Boarding

7.5

Food

6.4

Comfort

7.2

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
11,254 reviews
American Airlines
7.2
Good
11,254 reviews
Check prices

Crew

8.0

Overall

7.2

Entertainment

6.9

Boarding

7.5

Food

6.4

Comfort

7.2

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 airline flying from Belfast Intl to Washington

Discover the top airline 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 8 February 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£551Average£551FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

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

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