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Cheap flights from Washington to Belfast from £449

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 13/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
17 out — 24 out1
1 adult
1 adult, Economy

Cheap flight deals from Washington to Belfast

Keep the following information in mind while searching for Washington to Belfast flight deals. Data was last updated 17 setembro 2025.

Round-trip from

£449

Popular in

December

Cheapest in

March

Average price

£722
13/10-20/10
  • 13/10-20/10
  • 4 total stops
  • 39h 45m total
  • Washington to Belfast
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£38 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Washington to Belfast

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 17 setembro 2025.

seg 13/1015:45SEA - BHD
2 stops17h 45mMultiple Airlines
seg 20/1006:40BHD - SEA
2 stops22h 00mMultiple Airlines
Deal found 15/9£449
seg 13/1020:20SEA - BHD
1 stop16h 25mAmerican Airlines
seg 20/1013:50BHD - SEA
1 stop29h 20mAmerican Airlines
Deal found 15/9£477
qua 8/1013:30PDX - BHD
2 stops23h 45mDelta
dom 12/1006:30BHD - PDX
1 stop12h 30mDelta
Deal found 17/9£504
seg 13/1015:45SEA - BFS
2 stops20h 40mMultiple Airlines
seg 20/1006:10BFS - SEA
2 stops22h 30mMultiple Airlines
Deal found 15/9£530
qua 3/1218:50SEA - BHD
1 stop13h 45mBritish Airways
dom 7/1220:25BHD - SEA
1 stop28h 30mBritish Airways
Deal found 14/9£545
sex 3/1015:00SEA - BHD
2 stops19h 15mAmerican Airlines
sex 10/1011:55BHD - SEA
2 stops19h 01mAmerican Airlines
Deal found 15/9£555
sex 3/1017:40SEA - BHD
1 stop19h 35mDelta
sex 10/1006:30BHD - SEA
1 stop17h 35mDelta
Deal found 15/9£571
qua 3/1207:20SEA - BHD
2 stops29h 40mDelta
dom 7/1206:30BHD - SEA
2 stops23h 51mDelta
Deal found 16/9£582
qua 29/1021:05SEA - BHD
2 stops16h 50mBritish Airways
qua 5/1117:40BHD - SEA
1 stop31h 15mBritish Airways
Deal found 15/9£676
qua 8/1007:00PDX - BHD
2 stops20h 55mBritish Airways
dom 12/1020:05BHD - PDX
2 stops35h 03mBritish Airways
Deal found 17/9£719
sex 31/1015:00SEA - BFS
2 stops17h 10mMultiple Airlines
sex 7/1107:50BFS - SEA
3 stops41h 15mMultiple Airlines
Deal found 16/9£856
sex 31/1009:50PDX - BFS
3 stops23h 55mMultiple Airlines
sex 7/1106:30BFS - PDX
2 stops18h 30mMultiple Airlines
Deal found 16/9£1,525

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 17 setembro 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

PortlandBelfast

PDX - BHD

PDXBHD

Portland

qua 8/10

13:30-21:15

2 stops23h 45m

Belfast City

dom 12/10

06:30-11:00

1 stop12h 30m

£504

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb 7/3

13:35-14:15

1 stop16h 40m

Belfast City

qua 18/3

11:25-17:55

1 stop13h 30m

£515

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb 7/3

13:35-14:15

1 stop16h 40m

Belfast City

ter 17/3

11:25-17:55

1 stop13h 30m

£515

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb 7/3

13:35-14:15

1 stop16h 40m

Belfast City

ter 17/3

11:25-00:49

2 stops20h 24m

£524

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb 7/3

13:35-14:15

1 stop16h 40m

Belfast City

qua 18/3

11:25-00:49

2 stops20h 24m

£525

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

seg 13/10

15:45-20:25

2 stops20h 40m

Belfast Intl

seg 20/10

06:10-20:40

2 stops22h 30m

£530

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

sex 31/10

15:00-15:10

2 stops17h 10m

Belfast Intl

sex 7/11

07:50-17:05

3 stops41h 15m

£856

PortlandBelfast

PDX - BFS

PDXBFS

Portland

sex 31/10

09:50-16:45

3 stops23h 55m

Belfast Intl

sex 7/11

06:30-17:00

2 stops18h 30m

£1,525

Flights are sorted by cheapest return flights first.

Deals found on 17/9

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 Delta and Finnair 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 7h 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 City 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.

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

    Currently, January is the cheapest month in which you can book a flight from State of Washington to Belfast (average of £67). Flying from State of Washington to Belfast in July is currently the most expensive (average of £90). 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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How does Cheapflights help users find flights from Washington to Belfast?

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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.

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