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Cheap flights from Belfast to Washington from £281

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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
24 Aug — 31 Aug1
1 adult

Cheap flight deals from Belfast to Washington

Keep the following information in mind while searching for Belfast to Washington flight deals. Data was last updated 19 August 2025.

Round-trip from

£533

One-way from

£281

Popular in

November

Cheapest in

May

Average price

£765
1/10-8/10
  • 1/10-8/10
  • 5 total stops
  • 55h 19m total
  • Belfast to Washington
Search Deals
4/10
  • 4/10
  • 3 total stops
  • 56h 54m total
  • Belfast to Washington
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£82 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£15 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Belfast to Washington

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 19 August 2025.

Wed 1/1021:50BFS - SEA
3 stops29h 24mMultiple Airlines
Wed 8/1008:40SEA - BFS
2 stops25h 55mMultiple Airlines
Deal found 17/8£533
Mon 15/906:40BHD - SEA
1 stop12h 55mBritish Airways
Wed 24/913:30SEA - BHD
1 stop14h 25mBritish Airways
Deal found 17/8£550
Tue 9/906:35BHD - SEA
1 stop12h 35mBritish Airways
Tue 16/913:30SEA - BHD
1 stop13h 05mBritish Airways
Deal found 19/8£573
Tue 9/906:30BHD - SEA
2 stops20h 30mDelta
Tue 16/913:55SEA - BHD
1 stop19h 00mDelta
Deal found 19/8£573

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 19 August 2025.
Use the filters below to find and compare flights from Belfast to Washington that are best for you.

Fly from

Belfast

Fly to

Washington

Route

Depart

Return

Price

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 1/10

21:50-19:14

3 stops29h 24m

Seattle/Tacoma Intl

Wed 8/10

08:40-18:35

2 stops25h 55m

£533

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 15/9

06:40-11:35

1 stop12h 55m

Seattle/Tacoma Intl

Wed 24/9

13:30-11:55

1 stop14h 25m

£550

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 9/9

06:35-11:10

1 stop12h 35m

Seattle/Tacoma Intl

Tue 16/9

13:30-10:35

1 stop13h 05m

£573

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 9/9

06:30-19:00

2 stops20h 30m

Seattle/Tacoma Intl

Tue 16/9

13:55-16:55

1 stop19h 00m

£573

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 4/10

19:35-20:29

3 stops56h 54m

£281

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 4/9

20:15-20:39

3 stops56h 24m

£289

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 20/10

21:55-10:29

2 stops44h 34m

£353

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 4/10

07:00-00:30

3 stops49h 30m

£386

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 20/10

08:50-10:22

2 stops33h 32m

£412

Flights are sorted by cheapest return flights first.

Deals found on 17/8

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 19 August 2025.
Check out reviews from past customers who have flown with American Airlines and British Airways 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
7.2
Good
10,000 reviews
Check prices

Overall

7.2

Boarding

7.5

Comfort

7.2

Entertainment

6.9

Food

6.5

Crew

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.
American Airlines
7.2
Good
10,000 reviews
American Airlines
7.2
Good
10,000 reviews
Check prices

Overall

7.2

Boarding

7.5

Comfort

7.2

Entertainment

6.9

Food

6.5

Crew

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.
British Airways
6.7
Okay
7,283 reviews
American Airlines
7.2
Good
10,000 reviews
Check prices

Overall

7.2

Boarding

7.5

Comfort

7.2

Entertainment

6.9

Food

6.5

Crew

8.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Aug 2025

MIA - DCA

Flight delayed 5 hours and was told it was due to mechanical issues. Instead of providing lodging due to missed connecting flight, American changed the cause of delay to weather, which meant they were not able required to provide a hotel. To make matters worse, one of our checked bags was lost even though its status said it was “by the plane” but no one at the service desk seemed able to locate it.

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 12h 55m. Fly via British Airways to get the fastest option. There are 4472 mi between Belfast and State of Washington.

  • 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.

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

    Currently, January is the cheapest month in which you can book a flight from Belfast to State of Washington (average of £622). Flying from Belfast 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

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Top 2 airlines flying from Belfast to Washington

Discover the top 2 airlines 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 19 August 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£435Average£533FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£555Average£555FlexibilityNo cancel feeOn-time71%
Search American Airlines 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 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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