In terms of precipitation, rainfall in Belfast Intl Airport ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Belfast Intl Airport when rainfall is around 50.0 mm.

If weather is an important factor for your trip to Belfast Intl Airport, 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 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

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

When flying from State of Washington to Belfast Intl Airport, 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 Washington to Belfast Intl that include hotel bookings?

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

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

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

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

Yes. Cheapflights offers flight deals from Washington to Belfast Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£266+ Cheap Flights from Washington to Belfast Intl Airport

Cheap flight deals from Washington to Belfast Intl

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Washington to Belfast Intl
Explore the most affordable flight options available from Washington to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 August 2026.

Wed 7/1015:40 -

3 stops23h 35m

Wed 14/1020:15 -

3 stops32h 25m

Deal found 25/8£656

Sat 10/1015:55 -

3 stops22h 45m

Sat 17/1006:20 -

2 stops22h 20m

Deal found 26/8£695

Tue 27/1015:45 -

2 stops22h 10m

Sat 31/1023:00 -

2 stops26h 00m

Deal found 27/8£714

Sat 29/815:40 -

2 stops21h 50m

Sat 5/921:40 -

3 stops31h 20m

Deal found 28/8£845

Wed 16/1207:45 -

3 stops25h 30m

Sat 2/119:50 -

2 stops29h 10m

Deal found 27/8£979

Find flight deals from Washington to Belfast Intl

Round-trip from	£656
One-way from	£266

7/10-14/10
6 total stops
56h 00m total
Washington to Belfast

Search Deals

26/1
2 total stops
22h 20m total
Washington to Belfast

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Sat 10/10

15:55-22:40

3 stops22h 45m

Belfast Intl

Sat 17/10

06:20-20:40

2 stops22h 20m

£695

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Wed 7/10

15:40-23:15

3 stops23h 35m

Belfast Intl

Wed 14/10

07:35-17:55

2 stops18h 20m

£714

PortlandBelfast

PDX Portland - BFS Belfast Intl

PDXBFS

Portland

Tue 27/10

15:45-20:55

2 stops22h 10m

Belfast Intl

Sat 31/10

23:00-18:00

2 stops26h 00m

£714

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Wed 16/12

07:45-17:15

3 stops25h 30m

Belfast Intl

Sat 2/1

19:50-17:00

2 stops29h 10m

£979

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Fri 18/12

18:55-22:00

1 stop19h 05m

Belfast Intl

Thu 31/12

17:20-17:00

2 stops31h 40m

£1,074

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Fri 18/12

18:55-22:00

1 stop19h 05m

Belfast Intl

Sun 3/1

20:40-17:00

2 stops28h 20m

£1,124

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Fri 18/12

18:55-22:00

1 stop19h 05m

Belfast Intl

Sat 2/1

23:00-17:00

2 stops26h 00m

£1,132

Fastest return journey

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Fri 18/12

18:55-22:00

1 stop19h 05m

Belfast Intl

Fri 1/1

07:55-17:00

2 stops17h 05m

£1,155

Cheapest one-way

Fastest single journey

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Tue 26/1

14:35-20:55

2 stops22h 20m

£266

Flights are sorted by cheapest return flights first.

Deals found on 25/8

Sorted by cheapest first

Best time to book a flight from Washington to Belfast Intl

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

SEA-BFS

PDX-BFS

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 Belfast Intl Airport

USWA-BFS

SEA-BFS

PDX-BFS

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

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Cheap flights from Washington to Belfast Intl Airport from £266

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 26/1. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Washington to Belfast Intl

Cheapest flights from Washington to Belfast IntlExplore the most affordable flight options available from Washington to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 August 2026.

Explore the most affordable flight options available from Washington to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 August 2026.

Best flights from Washington to Belfast IntlDiscover carefully curated flight deals from Washington to Belfast Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 August 2026.

Discover carefully curated flight deals from Washington to Belfast Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 August 2026.

Last-minute flights from Washington to Belfast IntlDiscover last-minute flight deals from Washington to Belfast Intl. Data last updated 28 August 2026 and is based on user searches.

Discover last-minute flight deals from Washington to Belfast Intl. Data last updated 28 August 2026 and is based on user searches.

One-way flights from Washington to Belfast IntlSearch for one-way flight options from Washington to Belfast Intl. Find affordable one-way fares based on user searches. Data last updated 28 August 2026.

Search for one-way flight options from Washington to Belfast Intl. Find affordable one-way fares based on user searches. Data last updated 28 August 2026.

Find flight deals from Washington to Belfast Intl

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

Best time to book a flight from Washington to Belfast Intl

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Related info for your journey

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

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

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

Travelling to a place near Belfast Intl Airport?

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 Belfast Intl

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

Other flights to Belfast Intl

Explore flights to Belfast Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 28 August 2026.

Complete your trip

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

Direct flights to Northern Ireland

Book a non-stop flight to one of these other cities located in Northern Ireland.

Search flights from Washington to Belfast Intl by cabin class

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

Washington and Belfast Intl flights

Browse other Washington and Belfast Intl flight options. Last updated on 28 August 2026.

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

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Cheapest flights from Washington to Belfast Intl
Explore the most affordable flight options available from Washington to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 August 2026.

Best flights from Washington to Belfast Intl
Discover carefully curated flight deals from Washington to Belfast Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 28 August 2026.

Last-minute flights from Washington to Belfast Intl
Discover last-minute flight deals from Washington to Belfast Intl. Data last updated 28 August 2026 and is based on user searches.

One-way flights from Washington to Belfast Intl
Search for one-way flight options from Washington to Belfast Intl. Find affordable one-way fares based on user searches. Data last updated 28 August 2026.