Find flights
When to book
FAQs

Cheap flights from Washington to Northern Ireland from £273

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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
31 Aug — 7 Sep1
1 adult

Cheap flight deals from Washington to Northern Ireland

Keep the following information in mind while searching for Washington to Northern Ireland flight deals. Data was last updated 26 August 2025.

Round-trip from

£505

One-way from

£273

Popular in

July

Cheapest in

March

Average price

£626
17/11-26/11
  • 17/11-26/11
  • 4 total stops
  • 40h 05m total
  • Washington to Northern Ireland
Search Deals
6/9
  • 6/9
  • 2 total stops
  • 58h 02m total
  • Washington to Northern Ireland
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£50 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Washington to Northern Ireland

Cheapest flights from Washington to Northern Ireland
Explore the most affordable flight options available from Washington to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 August 2025.

Mon 17/1114:35SEA - BFS
2 stops21h 35mMultiple Airlines
Wed 26/1106:30BFS - SEA
2 stops18h 30mMultiple Airlines
Deal found 24/8£505
Mon 17/1114:35SEA - BHD
2 stops21h 55mMultiple Airlines
Wed 26/1107:25BHD - SEA
2 stops17h 35mMultiple Airlines
Deal found 24/8£517
Thu 9/1019:00SEA - BFS
2 stops17h 35mMultiple Airlines
Thu 16/1006:10BFS - SEA
2 stops22h 30mMultiple Airlines
Deal found 25/8£521
Mon 17/1118:50SEA - BHD
1 stop15h 45mBritish Airways
Wed 26/1112:25BHD - SEA
1 stop12h 30mBritish Airways
Deal found 24/8£534
Wed 29/1019:50SEA - BHD
1 stop13h 45mBritish Airways
Wed 5/1119:25BHD - SEA
1 stop29h 30mBritish Airways
Deal found 24/8£555
Wed 24/913:30SEA - BHD
1 stop14h 25mBritish Airways
Tue 7/1020:20BHD - SEA
1 stop23h 15mBritish Airways
Deal found 25/8£560
Wed 3/1218:50SEA - BHD
1 stop13h 45mBritish Airways
Sun 7/1217:35BHD - SEA
1 stop31h 20mBritish Airways
Deal found 24/8£577
Wed 24/910:25SEA - BHD
2 stops22h 30mDelta
Tue 7/1006:30BHD - SEA
2 stops19h 53mDelta
Deal found 25/8£608
Wed 3/1207:20SEA - BHD
2 stops25h 30mDelta
Sun 7/1206:30BHD - SEA
1 stop13h 20mDelta
Deal found 24/8£637
Wed 3/917:40SEA - BHD
1 stop15h 15mKLM
Tue 9/917:25BHD - SEA
1 stop26h 20mKLM
Deal found 25/8£693
Thu 25/912:00SEA - BFS
2 stops20h 15mMultiple Airlines
Mon 6/1006:45BFS - SEA
2 stops21h 55mMultiple Airlines
Deal found 25/8£845

Cheapflights Fare Finder

 
Customise your flight search to find flights from Washington to Northern Ireland 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 26 August 2025.
Use the filters below to find and compare flights from Washington to Northern Ireland that are best for you.

Fly from

Washington

Fly to

Northern Ireland

Route

Depart

Return

Price

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 17/11

14:35-20:10

2 stops21h 35m

Belfast Intl

Wed 26/11

06:30-17:00

2 stops18h 30m

£505

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 17/11

14:35-20:30

2 stops21h 55m

Belfast City

Wed 26/11

07:25-17:00

2 stops17h 35m

£517

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 9/10

19:00-20:35

2 stops17h 35m

Belfast Intl

Thu 16/10

06:10-20:40

2 stops22h 30m

£521

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 17/11

18:50-18:35

1 stop15h 45m

Belfast City

Wed 26/11

12:25-16:55

1 stop12h 30m

£534

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 29/10

19:50-16:35

1 stop13h 45m

Belfast City

Wed 5/11

19:25-16:55

1 stop29h 30m

£555

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 24/9

13:30-11:55

1 stop14h 25m

Belfast City

Tue 7/10

20:20-11:35

1 stop23h 15m

£560

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 14/10

13:30-10:35

1 stop13h 05m

Belfast City

Sun 19/10

06:50-11:30

1 stop12h 40m

£577

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

18:50-16:35

1 stop13h 45m

Belfast City

Sun 7/12

12:10-16:55

1 stop12h 45m

£577

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 24/9

10:25-16:55

2 stops22h 30m

Belfast City

Tue 7/10

06:30-18:23

2 stops19h 53m

£608

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

11:15-16:50

2 stops21h 35m

Belfast City

Sun 7/12

17:20-11:50

1 stop26h 30m

£637

Flights are sorted by cheapest return flights first.

Deals found on 25/8

Showing 1-10 of 19 results
1
2

Best time to book a flight from Washington to Northern Ireland

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

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

Related info for your journey

Find useful and relevant information for your journey from Washington to Northern Ireland. 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 Northern Ireland?

    There are many flights that can get you from State of Washington to Northern Ireland in 15h 45m. Fly via British Airways to get the fastest option. Airlines will cover a distance of 4472 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington to Northern Ireland 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 Northern Ireland?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to Northern Ireland (average of £67). Flying from State of Washington to Northern Ireland 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Washington to Northern Ireland

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Gatwick flights
Newark to Gatwick flights
John F Kennedy Intl to London City flights
Newark to London City flights
LaGuardia to Heathrow flights
John F Kennedy Intl to Stansted flights
Boston to Heathrow flights
LaGuardia to Gatwick flights
Dulles Intl to Heathrow flights
Los Angeles to Heathrow flights
Newark to Stansted flights
O'Hare Intl to Heathrow flights
Newark to Luton flights
San Francisco to Heathrow flights
Baltimore to Heathrow flights
Seattle to Heathrow flights
Dallas/Fort Worth to Heathrow flights
Miami to Heathrow flights
Atlanta to Heathrow flights
Hobby to Heathrow flights
Denver to Heathrow flights
Boston to London City flights
Boston to Gatwick flights
Dulles Intl to Gatwick flights
Philadelphia to Heathrow flights
Reagan-National to Heathrow flights
Los Angeles to London City flights
Baltimore to Gatwick flights
Dulles Intl to London City flights
Orlando to Heathrow flights
George Bush Intcntl to Heathrow flights
O'Hare Intl to Gatwick flights
Los Angeles to Gatwick flights
Newark to Edinburgh flights
San Francisco to Gatwick flights
Seattle to Gatwick flights
Reagan-National to Gatwick flights
O'Hare Intl to London City flights
John F Kennedy Intl to Edinburgh flights
Minneapolis to Heathrow flights
Raleigh to Heathrow flights
Boston to Stansted flights
Dallas/Fort Worth to Gatwick flights
San Francisco to London City flights
Austin to Heathrow flights
Boston to Luton flights

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 Northern Ireland?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Washington to Northern Ireland. 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 Northern Ireland?

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 Northern Ireland from Washington.

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

Certainly. Search results for flights to Northern Ireland from Washington shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Not ready to book yet? You can track prices for flights from Washington to Northern Ireland on Cheapflights with our Price Alert feature and get notified when better prices are available.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.