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 time of day to fly from BFS to WA?

When flying from Belfast Intl Airport to State of Washington, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Can I find deals for flights from Belfast Intl to Washington that include hotel bookings?

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

How can I find direct flights from Belfast Intl to Washington?

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

Can I find deals for business class flights from Belfast Intl to Washington?

Yes. Cheapflights offers flight deals from Belfast Intl 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.

£478+ Cheap Flights from Belfast Intl Airport to Washington

Cheap flight deals from Belfast Intl to Washington

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Cheapest flights from Belfast Intl to Washington
Explore the most affordable flight options available from Belfast Intl to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 September 2026.

Thu 5/1109:05 -

2 stops15h 55m

Thu 12/1114:35 -

2 stops20h 10m

Deal found 21/9£596

Wed 4/1113:20 -

3 stops34h 35m

Wed 11/1114:35 -

2 stops21h 45m

Deal found 20/9£661

Sun 8/1120:40 -

3 stops28h 20m

Sun 15/1114:35 -

2 stops23h 05m

Deal found 24/9£693

Find flight deals from Belfast Intl to Washington

Round-trip from	£508
One-way from	£478

15/10-22/10
2 total stops
38h 10m total
Belfast to Washington

Search Deals

11/10-31/12
3 total stops
52h 35m total
Belfast to Washington

Search Deals

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Use the filters below to find and compare flights from Belfast Intl Airport to Washington that are best for you.

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Route

Depart

Return

Price

Cheapest return flight

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sat 10/10

15:20-17:20

3 stops58h 00m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£497

Fastest return journey

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Thu 5/11

09:05-17:00

2 stops15h 55m

Seattle/Tacoma Intl

Thu 12/11

14:35-18:45

2 stops20h 10m

£596

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 11/10

06:10-19:00

2 stops44h 50m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£605

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Wed 4/11

13:20-15:55

3 stops34h 35m

Seattle/Tacoma Intl

Wed 11/11

14:35-20:20

2 stops21h 45m

£661

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 8/11

20:40-17:00

3 stops28h 20m

Seattle/Tacoma Intl

Sun 15/11

14:35-20:35

3 stops22h 00m

£742

Flights are sorted by cheapest return flights first.

Deals found on 24/9

Sorted by cheapest first

Best time to book a flight from Belfast Intl to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Belfast Intl with our price prediction graph.

BFS-SEA

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 Belfast Intl Airport to Washington

BFS-USWA

BFS-SEA

No data available for this route at this time. Please check back soon.

Related info for your journey

Can I find deals for flights from Belfast Intl to Washington that include hotel bookings?
Yes. In addition to deals on Belfast Intl to Washington flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Belfast Intl to Washington?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast Intl to Washington.
Can I find deals for business class flights from Belfast Intl to Washington?
Yes. Cheapflights offers flight deals from Belfast Intl 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.

Browse thousands of different options on Cheapflights for your next trip

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Complete your trip

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Alternative routes for Belfast Intl to Washington

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Can Cheapflights find flights from Belfast Intl to Washington with no change fees?

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Can Cheapflights notify me if prices for flights from Belfast Intl to Washington become cheaper?

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Cheap flights from Belfast Intl Airport to Washington from £478

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Belfast Intl to Washington

Cheapest flights from Belfast Intl to WashingtonExplore the most affordable flight options available from Belfast Intl to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 September 2026.

Explore the most affordable flight options available from Belfast Intl to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 September 2026.

Best flights from Belfast Intl to WashingtonDiscover carefully curated flight deals from Belfast Intl to Washington that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 24 September 2026.

Discover carefully curated flight deals from Belfast Intl to Washington that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 24 September 2026.

Last-minute flights from Belfast Intl to WashingtonDiscover last-minute flight deals from Belfast Intl to Washington. Data last updated 24 September 2026 and is based on user searches.

Discover last-minute flight deals from Belfast Intl to Washington. Data last updated 24 September 2026 and is based on user searches.

One-way flights from Belfast Intl to WashingtonSearch for one-way flight options from Belfast Intl to Washington. Find affordable one-way fares based on user searches. Data last updated 24 September 2026.

Search for one-way flight options from Belfast Intl to Washington. Find affordable one-way fares based on user searches. Data last updated 24 September 2026.

Find flight deals from Belfast Intl to Washington

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Use the filters below to find and compare flights from Belfast Intl Airport to Washington that are best for you.

Best time to book a flight from Belfast Intl to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Belfast Intl with our price prediction graph.

Cheapflights Insights

Related info for your journey

Can I find deals for flights from Belfast Intl to Washington that include hotel bookings?

How can I find direct flights from Belfast Intl to Washington?

Can I find deals for business class flights from Belfast Intl to 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 Belfast Intl to Washington

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

Complete your trip

Complete your trip to Washington by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to United States

Book a non-stop flight to one of these other cities located in United States.

Search flights from Belfast Intl to Washington by cabin class

Find flights from Belfast Intl to Washington, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Belfast Intl and Washington flights

Browse other Belfast Intl and Washington flight options. Last updated on 24 September 2026.

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How does Cheapflights help users find flights from Belfast Intl to Washington?

Why should you use Cheapflights to find cheap flight tickets from Belfast Intl to Washington?

Can Cheapflights find flights from Belfast Intl to Washington with no change fees?

Can Cheapflights notify me if prices for flights from Belfast Intl to Washington become cheaper?

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Book with Flexibility

Travel Smart

Cheapest flights from Belfast Intl to Washington
Explore the most affordable flight options available from Belfast Intl to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 September 2026.

Best flights from Belfast Intl to Washington
Discover carefully curated flight deals from Belfast Intl to Washington that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 24 September 2026.

Last-minute flights from Belfast Intl to Washington
Discover last-minute flight deals from Belfast Intl to Washington. Data last updated 24 September 2026 and is based on user searches.

One-way flights from Belfast Intl to Washington
Search for one-way flight options from Belfast Intl to Washington. Find affordable one-way fares based on user searches. Data last updated 24 September 2026.