Find flights
When to book

Cheap flights from Belfast Intl Airport to Washington from £432

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
17 Jul — 24 Jul1
1 adult

Cheap 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 12 July 2025.

Round-trip from

£687

One-way from

£432
24/8-31/8
  • 24/8-31/8
  • 6 total stops
  • 53h 23m total
  • Belfast to Washington
23/8
  • 23/8
  • 3 total stops
  • 44h 53m total
  • Belfast to Washington

Find flight deals from Belfast Intl to Washington

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 12 July 2025.

Sun 24/822:40BFS - SEA
3 stops29h 48mMultiple Airlines
Sun 31/815:45SEA - BFS
3 stops23h 35mMultiple Airlines
Deal found 10/7£687

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 12 July 2025.
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 24/8

22:40-20:28

3 stops29h 48m

Seattle/Tacoma Intl

Sun 31/8

15:45-23:20

3 stops23h 35m

£687

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 23/8

05:45-18:38

3 stops44h 53m

£432

Flights are sorted by cheapest return flights first.

Deals found on 11/7

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.

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.

  • What is the cheapest month to book a flight from Belfast Intl Airport to State of Washington?

    Currently, January is the cheapest month in which you can book a flight from Belfast Intl Airport to State of Washington (average of £622). Flying from Belfast Intl Airport to State of Washington in July is currently the most expensive (average of £946). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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.

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 12 July 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£435Average£533FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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 Belfast Intl to Washington?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Washington from Belfast Intl today with Cheapflights!

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

Millions of users choose and trust Cheapflights to book the best flight deals from Belfast Intl 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 Intl to Washington with no change fees?

Need flexible booking options for your flight to Washington from Belfast Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights offers price alerts on Belfast Intl to Washington 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.