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Cheap flights from Northern Ireland to Washington from £403

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
25 Jul — 1 Aug1
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 25 June 2026.

Thu 22/1006:30
BHD
-
SEA
1 stop13h 05m
British Airways
Mon 26/1019:50
SEA
-
BHD
1 stop15h 45m
British Airways
Deal found 24/6£557
Thu 17/906:30
BHD
-
SEA
1 stop13h 05m
British Airways
Mon 21/917:40
SEA
-
BHD
2 stops31h 20m
British Airways
Deal found 23/6£598
Thu 24/919:30
BHD
-
SEA
1 stop24h 05m
British Airways
Sun 27/906:15
SEA
-
BHD
2 stops20h 15m
British Airways
Deal found 24/6£605
Thu 3/1207:00
BHD
-
SEA
2 stops17h 55m
British Airways
Mon 7/1211:22
SEA
-
BHD
2 stops18h 53m
British Airways
Deal found 24/6£629
Sat 4/717:30
BHD
-
SEA
1 stop26h 03m
Delta
Sat 11/717:40
SEA
-
BHD
1 stop15h 15m
Delta
Deal found 21/6£651
Sun 26/711:00
BHD
-
SEA
2 stops34h 19m
American Airlines
Mon 3/806:00
SEA
-
BHD
2 stops25h 30m
American Airlines
Deal found 23/6£659
Sun 9/821:05
BFS
-
SEA
2 stops27h 05m
Multiple Airlines
Sun 16/817:40
SEA
-
BFS
2 stops18h 35m
Multiple Airlines
Deal found 25/6£915
Fri 7/807:20
BFS
-
SEA
3 stops34h 20m
Multiple Airlines
Fri 14/819:10
SEA
-
BFS
2 stops18h 05m
Multiple Airlines
Deal found 22/6£917
Sat 4/707:00
BFS
-
SEA
2 stops17h 00m
Multiple Airlines
Sat 11/718:15
SEA
-
BFS
2 stops20h 25m
Multiple Airlines
Deal found 21/6£951

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 25 June 2026.

Round-trip from

£557

One-way from

£403
British Airways
  • British Airways
  • 22/10-26/10
  • 2 total stops
  • 28h 50m 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 25 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

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 22/10

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Mon 26/10

15:10-16:05

2 stops17h 55m

£577

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 17/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Mon 21/9

17:40-09:00

2 stops31h 20m

£598
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/12

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Mon 7/12

18:50-18:35

1 stop15h 45m

£605

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 24/9

14:20-11:35

1 stop29h 15m

Seattle/Tacoma Intl

Sun 27/9

20:20-20:35

1 stop16h 15m

£605

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 9/8

21:05-16:10

2 stops27h 05m

Seattle/Tacoma Intl

Sun 16/8

17:40-20:15

2 stops18h 35m

£915

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 7/8

07:20-09:40

3 stops34h 20m

Seattle/Tacoma Intl

Fri 14/8

19:10-21:15

2 stops18h 05m

£917
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 29/10

06:30-19:20

3 stops43h 50m

£403

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/10

07:15-19:20

3 stops43h 05m

£427

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/10

06:35-17:55

1 stop18h 20m

£431

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/8

07:00-17:10

2 stops18h 10m

£595

Flights are sorted by cheapest return flights first.

Deals found on 21/6

Showing 1-10 of 11 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 25 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
11,756 reviews
Check prices

Overall

7.1

Crew

7.9

Entertainment

6.8

Comfort

7.2

Boarding

7.5

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.
American Airlines
7.1
Good
11,756 reviews
American Airlines
7.1
Good
11,756 reviews
Check prices

Overall

7.1

Crew

7.9

Entertainment

6.8

Comfort

7.2

Boarding

7.5

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.

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 £577, 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.

  • 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 25 June 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£569Average£569FlexibilityNo 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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