What is the cheapest month to book a flight from Northern Ireland to State of Washington?

Currently, January is the cheapest month in which you can book a flight from Northern Ireland to State of Washington (average of £622). Flying from Northern Ireland to State of Washington in July is currently the most expensive (average of £946). 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.

In terms of precipitation, rainfall in State of Washington ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit State of Washington when rainfall is around 18.0 mm.

If weather is an important factor for your trip to State of Washington, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

What is the cheapest month to fly from Northern Ireland to State of Washington?

May is one of the best times of the year to fly to State of Washington from Northern Ireland. Prices for May average £617 per person but you can even find prices for as low as £430. The most expensive prices can be found in the month of July. Opting for a May flight can save you 30% on your journey compared to booking in July

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.

£603+ Flights from Northern Ireland to Washington

Cheap flight deals from Northern Ireland to Washington

Round-trip from	£603
Popular in	July
Cheapest in	May
Average price	£805

KLM
30/8-11/9
2 total stops
36h 10m total
Northern Ireland to Washington

Search Deals

Highest demand for flights based on searches. 18% potential increase in price (£100 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 July 2025

Search Deals

Find flight deals from Northern Ireland to Washington

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 11 July 2025.

Sat 30/806:30BHD - SEA

1 stop17h 25mKLM

Thu 11/914:10SEA - BHD

1 stop18h 45mKLM

Deal found 9/7£603

Sat 30/806:30BHD - SEA

2 stops20h 25mVirgin Atlantic

Thu 11/909:25SEA - BHD

2 stops23h 30mVirgin Atlantic

Deal found 9/7£619

Sat 30/806:30BHD - SEA

1 stop17h 25mMultiple Airlines

Fri 12/917:40SEA - BHD

1 stop15h 15mMultiple Airlines

Deal found 9/7£634

Sun 24/822:40BFS - SEA

3 stops29h 48mMultiple Airlines

Sun 31/815:45SEA - BFS

3 stops23h 35mMultiple Airlines

Deal found 10/7£684

Sat 30/819:00BHD - SEA

2 stops33h 02mBritish Airways

Wed 10/910:11SEA - BHD

2 stops19h 19mBritish Airways

Deal found 9/7£724

Best flights from Northern Ireland to Washington
Discover carefully curated flight deals from Northern Ireland to Washington that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 11 July 2025.

Sat 30/806:30BHD - SEA

1 stop17h 25mKLM

Thu 11/914:10SEA - BHD

1 stop18h 45mKLM

Deal found 9/7£603

Sat 30/806:30BHD - SEA

2 stops20h 25mVirgin Atlantic

Thu 11/909:25SEA - BHD

2 stops23h 30mVirgin Atlantic

Deal found 9/7£619

Sat 30/806:30BHD - SEA

1 stop17h 25mMultiple Airlines

Fri 12/917:40SEA - BHD

1 stop15h 15mMultiple Airlines

Deal found 9/7£634

Sat 30/819:00BHD - SEA

2 stops33h 02mBritish Airways

Wed 10/910:11SEA - BHD

2 stops19h 19mBritish Airways

Deal found 9/7£724

Sun 24/822:40BFS - SEA

3 stops29h 48mMultiple Airlines

Sun 31/815:45SEA - BFS

3 stops23h 35mMultiple Airlines

Deal found 10/7£684

Last-minute flights from Northern Ireland to Washington
Discover last-minute flight deals from Northern Ireland to Washington. Data last updated 11 July 2025 and is based on user searches.

Sun 24/822:40BFS - SEA

3 stops29h 48mMultiple Airlines

Sun 31/815:45SEA - BFS

3 stops23h 35mMultiple Airlines

Deal found 10/7£684

Sat 30/806:30BHD - SEA

1 stop17h 25mKLM

Thu 11/914:10SEA - BHD

1 stop18h 45mKLM

Deal found 9/7£603

Sat 30/806:30BHD - SEA

2 stops20h 25mVirgin Atlantic

Thu 11/909:25SEA - BHD

2 stops23h 30mVirgin Atlantic

Deal found 9/7£619

Sat 30/806:30BHD - SEA

1 stop17h 25mMultiple Airlines

Fri 12/917:40SEA - BHD

1 stop15h 15mMultiple Airlines

Deal found 9/7£634

Sat 30/819:00BHD - SEA

2 stops33h 02mBritish Airways

Wed 10/910:11SEA - BHD

2 stops19h 19mBritish Airways

Deal found 9/7£724

One-way flights from Northern Ireland to Washington
Search for one-way flight options from Northern Ireland to Washington. Find affordable one-way fares based on user searches. Data last updated 11 July 2025.

Wed 30/706:55BHD - SEA

2 stops22h 48mBritish Airways

Deal found 10/7£968

Wed 30/708:40BFS - SEA

2 stops18h 18mMultiple Airlines

Deal found 10/7£980

Wed 30/706:50BHD - SEA

1 stop12h 45mMultiple Airlines

Deal found 10/7£1,143

Cheapflights Fare Finder

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

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 30/8

06:30-15:55

1 stop17h 25m

Seattle/Tacoma Intl

Thu 11/9

14:10-16:55

1 stop18h 45m

£603

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 30/8

06:30-18:55

2 stops20h 25m

Seattle/Tacoma Intl

Thu 11/9

09:25-16:55

2 stops23h 30m

£619

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 30/8

06:30-15:55

1 stop17h 25m

Seattle/Tacoma Intl

Fri 12/9

17:40-16:55

1 stop15h 15m

£634

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 24/8

22:40-20:28

3 stops29h 48m

Seattle/Tacoma Intl

Sun 31/8

15:45-23:20

3 stops23h 35m

£684

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 30/8

19:00-20:02

2 stops33h 02m

Seattle/Tacoma Intl

Wed 10/9

10:11-13:30

2 stops19h 19m

£724

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 30/7

06:55-21:43

2 stops22h 48m

£968

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 30/7

08:40-18:58

2 stops18h 18m

£980

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 30/7

06:50-11:35

1 stop12h 45m

£1,143

Flights are sorted by cheapest return flights first.

Deals found on 10/7

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

What is the cheapest time of day to fly from NIR to WA?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Northern Ireland to State of Washington as you normally would.

Reviews of airlines servicing Washington

Read through reviews of airlines operating flights from Northern Ireland to Washington, such as KLM, Virgin Atlantic, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

KLM

7.8

Good

1,372 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

KLM

7.8

Good

1,372 reviews

KLM

7.8

Good

1,372 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Virgin Atlantic

7.4

Good

654 reviews

KLM

7.8

Good

1,372 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

British Airways

6.6

Okay

7,109 reviews

KLM

7.8

Good

1,372 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

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.
What is the cheapest month to book a flight from Northern Ireland to State of Washington?
Currently, January is the cheapest month in which you can book a flight from Northern Ireland to State of Washington (average of £622). Flying from Northern Ireland to State of Washington in July is currently the most expensive (average of £946). 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

Alternative routes for Northern Ireland to Washington

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London City to San Francisco flights

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Complete your trip

State of Washington car hire

Seattle/Tacoma Intl Airport car hire

Wenatchee Pangborn Field Airport car hire

Spokane Airport car hire

Pasco Tri Cities Airport car hire

Bellingham Airport car hire

Pullman Moscow Regional Airport car hire

Yakima Air Terminal Airport car hire

Walla Walla Airport car hire

Kenmore Air Harbor Airport car hire

Seattle car hire

Bellingham car hire

Direct flights to United States

Top airline flying from Northern Ireland to Washington

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest£433	Average£530	FlexibilityNo cancel fee	On-time70%	Search British Airways flights

Fly with Cheapflights

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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Cheap flights from Northern Ireland to Washington from £603

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 30/8. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap 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 11 July 2025.

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from Northern Ireland to Washington

Cheapest flights from Northern Ireland to WashingtonExplore 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 11 July 2025.

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 11 July 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Northern Ireland to Washington that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Northern Ireland to Washington

What is the cheapest time of day to fly from NIR to WA?

Find hourly flight availability from Northern Ireland to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 July 2025.

Reviews of airlines servicing Washington

Read through reviews of airlines operating flights from Northern Ireland to Washington, such as KLM, Virgin Atlantic, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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.

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

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

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

What is the cheapest month to book a flight from Northern Ireland to State of Washington?

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 Northern Ireland to Washington

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Northern Ireland to Washington

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 Northern Ireland to Washington?

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

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

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

100% Free

Book with Flexibility

Travel Smart

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 11 July 2025.