In terms of precipitation, rainfall in Seattle 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 Seattle when rainfall is around 18.0 mm.

If weather is an important factor for your trip to Seattle, 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 SEA?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast Intl Airport to Seattle as you normally would.

What airport do you fly into for flights to Seattle from Belfast Intl?

Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Belfast Intl to Seattle. 0 airlines have flights to Seattle/Tacoma Intl from Belfast Intl on a regular basis. Booking flights from Belfast Intl to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 0 inbound flights from Belfast Intl per day.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Belfast Intl to Seattle 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 Seattle

Cheap flight deals from Belfast Intl to Seattle

Enter your travel dates to find the best prices.

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Best

Last-minute

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Cheapest flights from Belfast Intl to Seattle
Explore the most affordable flight options available from Belfast Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 September 2026.

Thu 15/1006:35 -

1 stop20h 25m

Thu 22/1021:40 -

1 stop17h 45m

Deal found 24/9£508

Thu 5/1109:05 -

2 stops15h 55m

Thu 12/1114:35 -

2 stops20h 10m

Deal found 21/9£596

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 Seattle

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

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

Search Deals

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

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

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

Sun 8/11

20:40-17:00

3 stops28h 20m

Seattle/Tacoma Intl

Sun 15/11

14:35-20:35

3 stops22h 00m

£742

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Thu 15/10

08:10-22:47

3 stops22h 37m

Seattle/Tacoma Intl

Thu 22/10

07:55-11:50

2 stops19h 55m

£1,091

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 Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle 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.

Related info for your journey

What airport do you fly into for flights to Seattle from Belfast Intl?
Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Belfast Intl to Seattle. 0 airlines have flights to Seattle/Tacoma Intl from Belfast Intl on a regular basis. Booking flights from Belfast Intl to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 0 inbound flights from Belfast Intl per day.
Can I find deals for flights from Belfast Intl to Seattle that include hotel bookings?
Yes. In addition to deals on Belfast Intl to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Belfast Intl to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast Intl to Seattle.
Can I find deals for business class flights from Belfast Intl to Seattle?
Yes. Cheapflights offers flight deals from Belfast Intl to Seattle 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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How does Cheapflights help users find flights from Belfast Intl to Seattle?

Cheapflights makes it easy to find Belfast Intl to Seattle flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

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 Seattle from Belfast Intl.

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

Yes, we can. To see specific flights from Belfast Intl to Seattle 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 Belfast Intl to Seattle become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Seattle from Belfast Intl today and book when prices fit your budget.

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Cheap flights from Belfast Intl Airport to Seattle 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 Seattle

Cheapest flights from Belfast Intl to SeattleExplore the most affordable flight options available from Belfast Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 September 2026.

Explore the most affordable flight options available from Belfast Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 September 2026.

Best flights from Belfast Intl to SeattleDiscover carefully curated flight deals from Belfast Intl to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 September 2026.

Discover carefully curated flight deals from Belfast Intl to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 September 2026.

Last-minute flights from Belfast Intl to SeattleDiscover last-minute flight deals from Belfast Intl to Seattle. Data last updated 25 September 2026 and is based on user searches.

Discover last-minute flight deals from Belfast Intl to Seattle. Data last updated 25 September 2026 and is based on user searches.

One-way flights from Belfast Intl to SeattleSearch for one-way flight options from Belfast Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated 25 September 2026.

Search for one-way flight options from Belfast Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated 25 September 2026.

Find flight deals from Belfast Intl to Seattle

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Cheapflights Fare Finder

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

Best time to book a flight from Belfast Intl to Seattle

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

Related info for your journey

What airport do you fly into for flights to Seattle from Belfast Intl?

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

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

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

Travelling to a place near Seattle?

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 Seattle

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

Complete your trip

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

Direct flights to Washington

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

Search flights from Belfast Intl to Seattle by cabin class

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

Belfast Intl and Seattle flights

Browse other Belfast Intl and Seattle flight options. Last updated on 25 September 2026.

Other flights from Belfast Intl

Browse through other flights departing from Belfast Intl. Flights are based on user searches made on Cheapflights and were last updated on 25 September 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Other flights to Seattle

Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 25 September 2026.

Fly with Cheapflights

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

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

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

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

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Travel Smart

Cheapest flights from Belfast Intl to Seattle
Explore the most affordable flight options available from Belfast Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 September 2026.

Best flights from Belfast Intl to Seattle
Discover carefully curated flight deals from Belfast Intl to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 September 2026.

Last-minute flights from Belfast Intl to Seattle
Discover last-minute flight deals from Belfast Intl to Seattle. Data last updated 25 September 2026 and is based on user searches.

One-way flights from Belfast Intl to Seattle
Search for one-way flight options from Belfast Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated 25 September 2026.