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Cheap flights from Washington to Belfast from £233

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 15/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Washington to Belfast

Enter your travel dates to find the best prices.

Cheapest flights from Washington to Belfast
Explore the most affordable flight options available from Washington to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 December 2025.

Fri 12/1211:34SEA - BHD
2 stops18h 41mBritish Airways
Fri 19/1206:45BHD - SEA
2 stops41h 54mBritish Airways
Deal found 11/12£910
Fri 12/1209:30SEA - BHD
2 stops23h 20mDelta
Fri 19/1206:30BHD - SEA
1 stop13h 20mDelta
Deal found 11/12£1,113
Fri 12/1215:05SEA - BHD
1 stop17h 45mKLM
Fri 19/1206:30BHD - SEA
1 stop13h 20mKLM
Deal found 11/12£1,152
Fri 12/1214:00SEA - BHD
2 stops22h 50mMultiple Airlines
Fri 19/1207:00BHD - SEA
3 stops23h 48mMultiple Airlines
Deal found 11/12£1,603

Find flight deals from Washington to Belfast

Keep the following information in mind while searching for Washington to Belfast flight deals. Data was last updated 12 December 2025.

Round-trip from

£450

One-way from

£233

Popular in

December

Cheapest in

April

Average price

£1,182
British Airways
  • British Airways
  • 7/3-18/3
  • 2 total stops
  • 26h 25m total
  • Washington to Belfast
Search Deals
15/1
  • 15/1
  • 2 total stops
  • 24h 00m total
  • Washington to Belfast
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£71 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£34 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

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

Fly from

Washington

Fly to

Belfast

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Tue 17/3

06:35-12:30

1 stop12h 55m

£450

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Wed 18/3

12:25-17:55

1 stop12h 30m

£450

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 19/2

07:15-10:20

2 stops19h 05m

Belfast City

Thu 26/2

10:40-16:55

1 stop14h 15m

£462

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 11/2

17:45-14:15

1 stop12h 30m

Belfast City

Sun 15/2

20:25-15:55

1 stop27h 30m

£466

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Tue 17/3

07:05-16:50

2 stops26h 45m

Belfast City

Tue 31/3

17:30-11:10

1 stop25h 40m

£503

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Tue 17/3

05:40-16:45

2 stops28h 05m

Belfast City

Tue 31/3

09:35-23:30

2 stops21h 55m

£504

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 25/1

14:35-18:55

2 stops20h 20m

Belfast Intl

Sun 1/2

07:10-17:00

2 stops17h 50m

£535

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 24/1

14:35-17:40

2 stops19h 05m

Belfast Intl

Sat 31/1

08:10-17:00

2 stops16h 50m

£561

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Fri 30/1

10:33-17:15

2 stops22h 42m

Belfast City

Tue 3/2

06:35-17:59

2 stops19h 24m

£626

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 19/2

14:35-22:35

2 stops24h 00m

Belfast Intl

Thu 26/2

20:05-13:20

2 stops25h 15m

£754

Flights are sorted by cheapest return flights first.

Deals found on 11/12

Showing 1-10 of 17 results
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Best time to book a flight from Washington to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast 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
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. 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?

    Airlines like British Airways and Delta fly from State of Washington to Belfast in about 16h 40m. The time it takes to get you to your destination can typically vary by up to 10h 05m. There are 4472 mi between State of Washington and Belfast. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from State of Washington to Belfast?

    When deciding which route to take from State of Washington to Belfast consider Seattle/Tacoma Intl - Belfast Intl, Seattle/Tacoma Intl - Belfast City or Portland - Belfast Intl as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington to Belfast 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

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Alternative routes for Washington to Belfast

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Fly with Cheapflights

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Washington to Belfast. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Belfast from Washington.

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Washington to Belfast, users can toggle the no change fees filter when performing a flight search.

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

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