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Cheap flights from Belfast to Washington from £451

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 21/8. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
14 Aug — 21 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Belfast to Washington

Enter your travel dates to find the best prices.

Cheapest flights from Belfast to Washington
Explore the most affordable flight options available from Belfast to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 July 2026.

Thu 6/816:35
BHD
-
SEA
1 stop27h 00m
American Airlines
Tue 11/813:30
SEA
-
BHD
1 stop20h 05m
American Airlines
Deal found 9/7£740
Thu 6/806:30
BHD
-
SEA
1 stop13h 05m
Multiple Airlines
Tue 11/813:30
SEA
-
BHD
1 stop13h 15m
Multiple Airlines
Deal found 9/7£763
Thu 6/806:30
BHD
-
SEA
2 stops26h 20m
British Airways
Tue 11/813:24
SEA
-
BHD
2 stops20h 11m
British Airways
Deal found 9/7£836
Thu 6/808:20
BFS
-
SEA
2 stops19h 05m
Multiple Airlines
Tue 11/821:45
SEA
-
BFS
1 stop17h 35m
Multiple Airlines
Deal found 9/7£845

Find flight deals from Belfast to Washington

Keep the following information in mind while searching for Belfast to Washington flight deals. Data was last updated 15 July 2026.

Round-trip from

£740

One-way from

£451
American Airlines
  • American Airlines
  • 6/8-11/8
  • 2 total stops
  • 47h 05m total
  • Belfast to Washington
Search Deals
21/8
  • 21/8
  • 3 total stops
  • 41h 22m total
  • Belfast to Washington
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Belfast 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 15 July 2026.
Use the filters below to find and compare flights from Belfast to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 6/8

16:35-11:35

1 stop27h 00m

Seattle/Tacoma Intl

Tue 11/8

13:30-17:35

1 stop20h 05m

£740
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 6/8

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 11/8

13:30-10:45

1 stop13h 15m

£763

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 6/8

06:30-00:50

2 stops26h 20m

Seattle/Tacoma Intl

Tue 11/8

13:24-17:35

2 stops20h 11m

£836

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 6/8

08:20-19:25

2 stops19h 05m

Seattle/Tacoma Intl

Tue 11/8

21:45-23:20

1 stop17h 35m

£845
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 21/8

09:40-19:02

3 stops41h 22m

£451

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/8

09:50-17:10

2 stops15h 20m

£640
Fastest single journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/8

06:30-11:35

1 stop13h 05m

£880

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/8

19:35-11:35

1 stop24h 00m

£889

Flights are sorted by cheapest return flights first.

Deals found on 14/7

Sorted by cheapest first

Best time to book a flight from Belfast to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Belfast 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 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 15 July 2026.
Check out reviews from past customers who have flown with American Airlines from Belfast to Washington to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.1
Good
11,808 reviews
Check prices

Crew

7.9

Entertainment

6.8

Boarding

7.5

Comfort

7.2

Food

6.4

Overall

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.
American Airlines
7.1
Good
11,808 reviews
American Airlines
7.1
Good
11,808 reviews
Check prices

Crew

7.9

Entertainment

6.8

Boarding

7.5

Comfort

7.2

Food

6.4

Overall

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.

Related info for your journey

Find useful and relevant information for your journey from Belfast to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Belfast to State of Washington?

    There are many flights that can get you from Belfast to State of Washington in 26h 20m. Fly via American Airlines or British Airways to get the fastest option. There are 4472 mi between Belfast and State of Washington. Both multi-stop and direct flights can be found to your destination and back.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Belfast 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Belfast to Washington

Discover the top airline that operate flights from Belfast 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 15 July 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£561Average£561FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

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

When you search for this flight from Belfast to Washington, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Belfast to Washington for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Yes, we can. To see specific flights from Belfast to Washington with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Yes! Start tracking prices for Belfast to Washington flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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