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Cheap flights from Northern Ireland to Washington from £397

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 29/10. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
15 Jul — 22 Jul1
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 15 June 2026.

Wed 16/920:35
BHD
-
SEA
1 stop23h 00m
British Airways
Wed 7/1011:34
SEA
-
BHD
2 stops18h 01m
British Airways
Deal found 13/6£575
Tue 15/909:40
BHD
-
SEA
2 stops19h 56m
British Airways
Tue 6/1020:20
SEA
-
BHD
1 stop13h 15m
British Airways
Deal found 15/6£579
Mon 7/915:20
BHD
-
SEA
1 stop28h 15m
British Airways
Mon 28/917:40
SEA
-
BHD
2 stops18h 55m
British Airways
Deal found 11/6£594
Tue 15/909:50
BHD
-
SEA
1 stop33h 57m
KLM
Tue 6/1017:45
SEA
-
BHD
1 stop15h 10m
KLM
Deal found 15/6£597
Thu 1/1020:35
BHD
-
SEA
1 stop23h 00m
British Airways
Mon 5/1013:30
SEA
-
BHD
1 stop15h 25m
British Airways
Deal found 10/6£604
Wed 14/1006:30
BHD
-
SEA
2 stops18h 40m
British Airways
Sun 18/1014:12
SEA
-
BHD
2 stops19h 28m
British Airways
Deal found 10/6£608
Fri 10/722:10
BFS
-
SEA
2 stops27h 00m
Multiple Airlines
Thu 16/719:10
SEA
-
BFS
2 stops16h 20m
Multiple Airlines
Deal found 11/6£725

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 15 June 2026.

Round-trip from

£575

One-way from

£397
British Airways
  • British Airways
  • 16/9-7/10
  • 3 total stops
  • 41h 01m total
  • Northern Ireland to Washington
Search Deals
29/10
  • 29/10
  • 3 total stops
  • 43h 50m 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 15 June 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 - SEA

BHDSEA

Belfast City

Wed 16/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Wed 7/10

20:20-18:45

1 stop14h 25m

£575

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 7/9

15:20-11:35

1 stop28h 15m

Seattle/Tacoma Intl

Mon 28/9

17:40-20:35

2 stops18h 55m

£594

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 15/9

09:50-11:47

1 stop33h 57m

Seattle/Tacoma Intl

Tue 6/10

17:45-16:55

1 stop15h 10m

£597

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 7/9

19:35-11:35

1 stop24h 00m

Seattle/Tacoma Intl

Mon 28/9

13:30-12:55

1 stop15h 25m

£604

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 1/10

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Mon 5/10

13:30-12:55

1 stop15h 25m

£604

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 14/10

06:30-17:10

2 stops18h 40m

Seattle/Tacoma Intl

Sun 18/10

14:12-17:40

2 stops19h 28m

£608

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 10/7

22:10-17:10

2 stops27h 00m

Seattle/Tacoma Intl

Thu 16/7

19:10-19:30

2 stops16h 20m

£725
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 29/10

06:30-19:20

3 stops43h 50m

£397

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/10

07:25-19:20

3 stops42h 55m

£418
Fastest single journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/10

06:35-17:55

1 stop18h 20m

£427

Flights are sorted by cheapest return flights first.

Deals found on 10/6

Showing 1-10 of 13 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.

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated 15 June 2026.
Read through reviews of airlines operating flights from Northern Ireland to Washington, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.1
Good
11,660 reviews
Check prices

Boarding

7.5

Crew

7.9

Comfort

7.2

Food

6.4

Overall

7.1

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Beatriz,May 2026

HEL - DFW

Very modern and confortable plane. Dinner was delicious. Whole crew were polite and perfect.
American Airlines
7.1
Good
11,660 reviews
American Airlines
7.1
Good
11,660 reviews
Check prices

Boarding

7.5

Crew

7.9

Comfort

7.2

Food

6.4

Overall

7.1

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Beatriz,May 2026

HEL - DFW

Very modern and confortable plane. Dinner was delicious. Whole crew were polite and perfect.

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 £575, British Airways can have you in State of Washington from Northern Ireland in 23h. The distance between Northern Ireland and State of Washington is about 4472 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Northern Ireland to Washington

Discover the top airline that operate flights from Northern Ireland to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 15 June 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£560Average£560FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

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.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Northern Ireland to Washington for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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.

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

Of course! You can now track prices for flights from Northern Ireland to Washington and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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