How long is the flight from Northern Ireland to Seattle?

For as low as £758, British Airways can have you in Seattle from Northern Ireland in 33h 25m. Airlines will cover a distance of 4472 mi.

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.

£758+ 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

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 31 October 2026.

Thu 10/1206:30 -

1 stop12h 55m

Thu 17/1214:01 -

2 stops18h 54m

Deal found 26/10£976

Thu 10/1217:15 -

1 stop26h 35m

Thu 17/1214:35 -

1 stop18h 00m

Deal found 26/10£1,101

Find flight deals from Northern Ireland to Seattle

Round-trip from	£758

British Airways
14/1-18/1
3 total stops
55h 03m total
Northern Ireland to Seattle

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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

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Thu 14/1

15:25-16:50

1 stop33h 25m

Seattle/Tacoma Intl

Mon 18/1

10:17-15:55

2 stops21h 38m

£758

Fastest return journey

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Thu 14/1

06:30-16:50

1 stop18h 20m

Seattle/Tacoma Intl

Sun 17/1

18:45-16:50

1 stop14h 05m

£758

Flights are sorted by cheapest return flights first.

Deals found on 28/10

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.

BHD-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

BHD-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.
How long is the flight from Northern Ireland to Seattle?
For as low as £758, British Airways can have you in Seattle from Northern Ireland in 33h 25m. Airlines will cover a distance of 4472 mi.
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.

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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 £758

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 14/1. 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 31 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 31 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 31 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 31 October 2026.

Find flight deals from Northern Ireland to Seattle

Round-trip from

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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?

How long is the flight from Northern Ireland to Seattle?

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

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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 31 October 2026.

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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 31 October 2026.