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Cheap flights from Northern Ireland to Washington from £363

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 2/11. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
11 Sep — 18 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Northern Ireland to Washington

Enter your travel dates to find the best prices.

Cheapest flights from Northern Ireland to Washington
Explore the most affordable flight options available from Northern Ireland to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 August 2026.

Wed 7/1011:35 -
1 stop32h 00m
Sun 11/1020:20 -
1 stop16h 15m
Deal found 7/8£721
Sun 6/906:30 -
1 stop13h 05m
Sun 13/913:30 -
1 stop23h 05m
Deal found 9/8£739
Mon 7/908:45 -
2 stops35h 00m
Fri 11/919:00 -
2 stops17h 30m
Deal found 10/8£745
Mon 7/906:10 -
3 stops35h 30m
Fri 11/915:40 -
3 stops23h 40m
Deal found 10/8£767
Sun 6/907:00 -
3 stops22h 00m
Sun 13/915:40 -
2 stops21h 25m
Deal found 9/8£836

Find flight deals from Northern Ireland to Washington

Keep the following information in mind while searching for Northern Ireland to Washington flight deals. Data was last updated 12 August 2026.

Round-trip from

£720

One-way from

£363
British Airways
  • British Airways
  • 7/10-11/10
  • 2 total stops
  • 48h 15m total
  • Northern Ireland to Washington
Search Deals
2/11
  • 2/11
  • 3 total stops
  • 55h 41m total
  • Northern Ireland to Washington
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Northern Ireland 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 12 August 2026.
Use the filters below to find and compare flights from Northern Ireland to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Wed 7/10

10:05-18:25

1 stop16h 20m

Seattle/Tacoma Intl

Sun 11/10

06:12-14:35

2 stops24h 23m

£721

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Wed 14/10

16:05-11:35

1 stop27h 30m

Seattle/Tacoma Intl

Sun 18/10

20:20-20:35

1 stop16h 15m

£721

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Mon 7/9

06:10-09:40

3 stops35h 30m

Seattle/Tacoma Intl

Fri 11/9

15:40-23:20

3 stops23h 40m

£767
Cheapest one-way

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Mon 14/9

07:00-15:08

3 stops40h 08m

£415

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Mon 2/11

07:20-17:00

2 stops17h 40m

£432

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Wed 26/8

22:45-18:45

3 stops52h 00m

£464

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Wed 26/8

18:30-17:10

2 stops30h 40m

£492

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Wed 26/8

07:00-09:19

3 stops34h 19m

£515

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Sun 3/1

20:00-17:00

2 stops29h 00m

£524

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Thu 27/8

06:50-17:10

2 stops18h 20m

£535

Flights are sorted by cheapest return flights first.

Deals found on 8/8

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

Best time to book a flight from Northern Ireland to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Northern Ireland 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 Northern Ireland to Washington

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 Northern Ireland 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 Northern Ireland to State of Washington?

    For as low as £721, British Airways can have you in State of Washington from Northern Ireland in 16h 20m. The distance between Northern Ireland and State of Washington is about 4472 mi.

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

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

  • How can I find direct flights from Northern Ireland to Washington?

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

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

    Yes. Cheapflights offers flight deals from Northern Ireland 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.

See more FAQs

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Alternative routes for Northern Ireland to Washington

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Fly with Cheapflights

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How does Cheapflights help users find flights from Northern Ireland to Washington?

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

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

Yes, we can. To see specific flights from Northern Ireland to Washington with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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