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Cheap flights from Washington to Belfast from £159

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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
22 Jan — 29 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Washington to Belfast

Enter your travel dates to find the best prices.

Best flights from Washington to Belfast
Discover carefully curated flight deals from Washington to Belfast that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 December 2025.

Sat 7/315:05SEA - BHD
1 stop17h 45mMultiple Airlines
Wed 18/317:20BHD - SEA
1 stop26h 15mMultiple Airlines
Deal found 21/12£481
Sat 7/315:05SEA - BHD
1 stop21h 55mDelta
Tue 17/306:30BHD - SEA
1 stop13h 05mDelta
Deal found 21/12£481
Wed 1/417:30SEA - BHD
1 stop15h 25mKLM
Wed 8/417:30BHD - SEA
1 stop31h 00mKLM
Deal found 21/12£491
Wed 14/117:45PDX - BHD
1 stop12h 30mBritish Airways
Wed 21/106:35BHD - PDX
1 stop17h 20mBritish Airways
Deal found 21/12£584
Sat 7/315:05SEA - BHD
1 stop21h 55mDelta
Wed 18/306:30BHD - SEA
2 stops20h 18mDelta
Deal found 21/12£488
Mon 23/306:44SEA - BHD
2 stops20h 56mMultiple Airlines
Fri 27/306:45BHD - SEA
1 stop12h 45mMultiple Airlines
Deal found 21/12£503
Wed 4/214:38PDX - BHD
2 stops20h 32mBritish Airways
Sun 8/217:35BHD - PDX
1 stop30h 20mBritish Airways
Deal found 20/12£733
Fri 6/207:20PDX - BHD
2 stops25h 55mBritish Airways
Sun 8/217:35BHD - PDX
1 stop30h 20mBritish Airways
Deal found 20/12£770
Wed 4/209:50PDX - BFS
3 stops24h 05mMultiple Airlines
Wed 11/210:10BFS - PDX
3 stops31h 05mMultiple Airlines
Deal found 21/12£778
Fri 20/306:40PDX - BHD
2 stops24h 35mMultiple Airlines
Sat 28/311:35BHD - PDX
2 stops30h 32mMultiple Airlines
Deal found 22/12£856

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 23 December 2025.

Round-trip from

£480

One-way from

£159

Popular in

December

Cheapest in

April

Average price

£1,179
British Airways
  • British Airways
  • 23/3-27/3
  • 2 total stops
  • 28h 30m total
  • Washington to Belfast
Search Deals
British Airways
  • British Airways
  • 12/4
  • 1 total stop
  • 16h 25m total
  • Washington to Belfast
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£70 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£33 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 23 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

15:05-16:50

1 stop17h 45m

Belfast City

Wed 18/3

17:20-12:35

1 stop26h 15m

£481

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

15:05-21:00

1 stop21h 55m

Belfast City

Tue 17/3

06:30-12:35

1 stop13h 05m

£481

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

15:05-21:00

1 stop21h 55m

Belfast City

Wed 18/3

06:30-19:48

2 stops20h 18m

£488

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 1/4

17:30-16:55

1 stop15h 25m

Belfast City

Wed 8/4

17:30-16:30

1 stop31h 00m

£491

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 23/3

06:44-10:40

2 stops20h 56m

Belfast City

Fri 27/3

06:45-12:30

1 stop12h 45m

£503

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 14/1

17:45-14:15

1 stop12h 30m

Belfast City

Wed 21/1

06:35-15:55

1 stop17h 20m

£584

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 4/2

14:38-19:10

2 stops20h 32m

Belfast City

Sun 8/2

17:35-15:55

1 stop30h 20m

£733

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Fri 6/2

07:20-17:15

2 stops25h 55m

Belfast City

Sun 8/2

17:35-15:55

1 stop30h 20m

£770

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Wed 4/2

09:50-17:55

3 stops24h 05m

Belfast Intl

Wed 11/2

10:10-09:15

3 stops31h 05m

£778

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Fri 20/3

06:40-14:15

2 stops24h 35m

Belfast City

Sat 28/3

11:35-11:07

2 stops30h 32m

£856

Flights are sorted by cheapest return flights first.

Deals found on 22/12

Showing 1-10 of 15 results
1
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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

How much does it cost for a return flight from State of Washington to Belfast?

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 Delta and British Airways fly from State of Washington to Belfast in about 12h 30m. The time it takes to get you to your destination can typically vary by up to 9h 25m. There are 4585 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Washington to Belfast

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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 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?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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