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Cheap flights from Washington to Belfast City Airport from £311

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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
31 Aug — 7 Sep1
1 adult

Cheap flight deals from Washington to Belfast City

Keep the following information in mind while searching for Washington to Belfast City flight deals. Data was last updated 26 August 2025.

Round-trip from

£517

One-way from

£311

Popular in

July

Cheapest in

March

Average price

£626
17/11-26/11
  • 17/11-26/11
  • 4 total stops
  • 39h 30m total
  • Washington to Belfast
Search Deals
7/9
  • 7/9
  • 2 total stops
  • 16h 54m total
  • Washington to Belfast
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£50 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Washington to Belfast City

Cheapest flights from Washington to Belfast City
Explore the most affordable flight options available from Washington to Belfast City. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 August 2025.

Mon 17/1114:35SEA - BHD
2 stops21h 55mMultiple Airlines
Wed 26/1107:25BHD - SEA
2 stops17h 35mMultiple Airlines
Deal found 24/8£517
Mon 17/1118:50SEA - BHD
1 stop15h 45mBritish Airways
Wed 26/1112:25BHD - SEA
1 stop12h 30mBritish Airways
Deal found 24/8£534
Wed 29/1019:50SEA - BHD
1 stop13h 45mBritish Airways
Wed 5/1119:25BHD - SEA
1 stop29h 30mBritish Airways
Deal found 24/8£555
Wed 24/913:30SEA - BHD
1 stop14h 25mBritish Airways
Tue 7/1020:20BHD - SEA
1 stop23h 15mBritish Airways
Deal found 25/8£560
Wed 3/1218:50SEA - BHD
1 stop13h 45mBritish Airways
Sun 7/1217:35BHD - SEA
1 stop31h 20mBritish Airways
Deal found 24/8£577
Wed 24/910:25SEA - BHD
2 stops22h 30mDelta
Tue 7/1006:30BHD - SEA
2 stops19h 53mDelta
Deal found 25/8£608
Wed 3/1207:20SEA - BHD
2 stops25h 30mDelta
Sun 7/1206:30BHD - SEA
1 stop13h 20mDelta
Deal found 24/8£637
Wed 3/917:40SEA - BHD
1 stop15h 15mKLM
Tue 9/917:25BHD - SEA
1 stop26h 20mKLM
Deal found 25/8£693

Cheapflights Fare Finder

 
Customise your flight search to find flights from Washington to Belfast City 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 26 August 2025.
Use the filters below to find and compare flights from Washington to Belfast City Airport that are best for you.

Fly from

Washington

Fly to

Belfast City

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 17/11

14:35-20:30

2 stops21h 55m

Belfast City

Wed 26/11

07:25-17:00

2 stops17h 35m

£517

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 17/11

18:50-18:35

1 stop15h 45m

Belfast City

Wed 26/11

12:25-16:55

1 stop12h 30m

£534

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 29/10

19:50-16:35

1 stop13h 45m

Belfast City

Wed 5/11

19:25-16:55

1 stop29h 30m

£555

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 24/9

13:30-11:55

1 stop14h 25m

Belfast City

Tue 7/10

20:20-11:35

1 stop23h 15m

£560

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 14/10

13:30-10:35

1 stop13h 05m

Belfast City

Sun 19/10

06:50-11:30

1 stop12h 40m

£577

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

18:50-16:35

1 stop13h 45m

Belfast City

Sun 7/12

12:10-16:55

1 stop12h 45m

£577

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 24/9

10:25-16:55

2 stops22h 30m

Belfast City

Tue 7/10

06:30-18:23

2 stops19h 53m

£608

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

11:15-16:50

2 stops21h 35m

Belfast City

Sun 7/12

17:20-11:50

1 stop26h 30m

£637

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sun 7/9

16:46-17:40

2 stops16h 54m

£311

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sun 7/9

15:15-16:55

2 stops17h 40m

£347

Flights are sorted by cheapest return flights first.

Deals found on 24/8

Showing 1-10 of 14 results
1
2

Best time to book a flight from Washington to Belfast City

Have a flexible travel schedule? Discover the best time to fly to Belfast City from Washington 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 Washington to Belfast City Airport
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 Washington to Belfast City. 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 State of Washington to Belfast City Airport?

    British Airways can get you from State of Washington to Belfast City Airport in just under 15h 45m. Your travel time can differ by up to . The distance from State of Washington to Belfast City Airport is about 4472 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington to Belfast City 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 State of Washington to Belfast City Airport?

    Currently, April is the cheapest month in which you can book a flight from State of Washington to Belfast City Airport (average of £98). Flying from State of Washington to Belfast City Airport in December is currently the most expensive (average of £116). 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

Travelling to a place near Belfast City Airport?

Book flights to Belfast City Airport if you plan to visit one of these locations
Newcastle
Bangor
Carrickfergus

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

Cheapflights helps you search for flights from Washington to Belfast City via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Washington to Belfast City for you. Better yet — we are completely free to use.

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

Certainly. Search results for flights to Belfast City from Washington shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

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

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