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 NIR to SEA?

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

What airport do you fly into for flights to Seattle from Northern Ireland?

Most people fly into Seattle/Tacoma Intl (SEA) if they book a flight to Seattle from Northern Ireland. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Northern Ireland 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.

£392+ Cheap Flights from Northern Ireland to Seattle

Cheap flight deals from Northern Ireland to Seattle

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Northern Ireland to Seattle
Explore the most affordable flight options available from Northern Ireland to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 October 2026.

Thu 29/1006:30 -

2 stops18h 30m

Thu 5/1114:35 -

2 stops21h 55m

Deal found 1/10£533

Wed 18/1108:20 -

2 stops16h 40m

Wed 25/1114:35 -

2 stops17h 40m

Deal found 4/10£724

Fri 30/1009:25 -

3 stops36h 47m

Fri 6/1114:35 -

2 stops24h 00m

Deal found 2/10£738

Thu 29/1010:10 -

3 stops39h 44m

Wed 4/1114:35 -

2 stops21h 45m

Deal found 3/10£829

Sat 14/1108:30 -

2 stops16h 30m

Sat 21/1114:35 -

2 stops23h 00m

Deal found 30/9£1,009

Find flight deals from Northern Ireland to Seattle

Round-trip from	£533
One-way from	£392

29/10-5/11
4 total stops
40h 25m total
Northern Ireland to Seattle

Search Deals

15/10-31/12
2 total stops
37h 50m total
Northern Ireland to Seattle

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Northern Ireland 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

Thu 15/10

14:50-20:40

2 stops37h 50m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£392

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Thu 29/10

06:30-18:00

2 stops18h 30m

Seattle/Tacoma Intl

Thu 5/11

14:35-20:30

2 stops21h 55m

£533

Fastest return journey

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Wed 18/11

08:20-17:00

2 stops16h 40m

Seattle/Tacoma Intl

Wed 25/11

14:35-16:15

2 stops17h 40m

£724

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Fri 30/10

09:25-15:12

3 stops36h 47m

Seattle/Tacoma Intl

Fri 6/11

14:35-22:00

3 stops23h 25m

£771

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Thu 29/10

10:10-18:54

3 stops39h 44m

Seattle/Tacoma Intl

Wed 4/11

14:35-20:20

2 stops21h 45m

£829

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sat 14/11

08:30-17:00

2 stops16h 30m

Seattle/Tacoma Intl

Sat 21/11

14:35-21:35

2 stops23h 00m

£1,009

Flights are sorted by cheapest return flights first.

Deals found on 3/10

Sorted by cheapest first

Best time to book a flight from Northern Ireland to Seattle

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

GBNIR-SEA

BFS-SEA

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

Related info for your journey

What airport do you fly into for flights to Seattle from Northern Ireland?
Most people fly into Seattle/Tacoma Intl (SEA) if they book a flight to Seattle from Northern Ireland. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.
Can I find deals for flights from Northern Ireland to Seattle that include hotel bookings?
Yes. In addition to deals on Northern Ireland to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Northern Ireland to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Northern Ireland to Seattle.
Can I find deals for business class flights from Northern Ireland to Seattle?
Yes. Cheapflights offers flight deals from Northern Ireland 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.

See more FAQs

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How does Cheapflights help users find flights from Northern Ireland to Seattle?

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

Cheapflights helps you find that perfect flight to Seattle from Northern Ireland by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Yes! Cheapflights helps users easily find flights from Northern Ireland to Seattle with no change fees.

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

Yes! Start tracking prices for Northern Ireland to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from Northern Ireland to Seattle from £392

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Northern Ireland to Seattle

Cheapest flights from Northern Ireland to SeattleExplore the most affordable flight options available from Northern Ireland to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 October 2026.

Explore the most affordable flight options available from Northern Ireland to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 October 2026.

Best flights from Northern Ireland to SeattleDiscover carefully curated flight deals from Northern Ireland to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 October 2026.

Discover carefully curated flight deals from Northern Ireland to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 October 2026.

Last-minute flights from Northern Ireland to SeattleDiscover last-minute flight deals from Northern Ireland to Seattle. Data last updated 5 October 2026 and is based on user searches.

Discover last-minute flight deals from Northern Ireland to Seattle. Data last updated 5 October 2026 and is based on user searches.

One-way flights from Northern Ireland to SeattleSearch for one-way flight options from Northern Ireland to Seattle. Find affordable one-way fares based on user searches. Data last updated 5 October 2026.

Search for one-way flight options from Northern Ireland to Seattle. Find affordable one-way fares based on user searches. Data last updated 5 October 2026.

Find flight deals from Northern Ireland to Seattle

Round-trip from

One-way from

Cheapflights Fare Finder

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

Best time to book a flight from Northern Ireland to Seattle

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

Cheapflights Insights

Related info for your journey

What airport do you fly into for flights to Seattle from Northern Ireland?

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

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

Can I find deals for business class flights from Northern Ireland 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 Northern Ireland 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 Northern Ireland to Seattle by cabin class

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

Northern Ireland and Seattle flights

Browse other Northern Ireland and Seattle flight options. Last updated on 5 October 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 5 October 2026.

Fly with Cheapflights

How does Cheapflights help users find flights from Northern Ireland to Seattle?

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

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

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

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Travel Smart

Cheapest flights from Northern Ireland to Seattle
Explore the most affordable flight options available from Northern Ireland to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 October 2026.

Best flights from Northern Ireland to Seattle
Discover carefully curated flight deals from Northern Ireland to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 October 2026.

Last-minute flights from Northern Ireland to Seattle
Discover last-minute flight deals from Northern Ireland to Seattle. Data last updated 5 October 2026 and is based on user searches.

One-way flights from Northern Ireland to Seattle
Search for one-way flight options from Northern Ireland to Seattle. Find affordable one-way fares based on user searches. Data last updated 5 October 2026.