How do most travelers feel about Finnair?

The general consensus from 544 Cheapflights users is that Finnair is a 7.0/10. Select your travel dates above for updated prices on flights from London Heathrow Airport to Seattle (LHR-SEA).

Can I get a flight from London Heathrow Airport to Seattle on Finnair for under £700?

London Heathrow Airport to Seattle flights on Finnair are currently available under £700. 8 flights have been found by Cheapflights users under that amount. To find flights for your dates, click here.

Weekly Finnair flight availability from London Heathrow Airport to Seattle

The most Finnair flights from LHR to SEA are scheduled on a Monday (2 on average). You will have fewer Finnair flight options on Sunday, which is when the least amount of flights are scheduled (1 on average).

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).

£374+ Finnair Flights from Heathrow to Seattle

Cheapflights users flying from London to Seattle on Finnair typically fly into Seattle/Tacoma Intl and depart from London Heathrow. Select your dates above for pricing.

Finnair flights from Heathrow to Seattle in 2025

One-way from	£374
Return from	£445
Popular in	July
Cheapest in	February
Average price (all airlines)	£502

Finnair
4/11
Nonstop
10h 05m total
London to Seattle

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Finnair
1/10-5/10
3 total stops
40h 39m total
London to Seattle

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Highest demand for flights from London Heathrow to Seattle/Tacoma Intl; 12% potential price increase.

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Best time to find cheap flights from London Heathrow to Seattle/Tacoma Intl; 2% potential price drop.

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Average price for all London Heathrow to Seattle/Tacoma Intl flights (one-way and round-trip).

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Can I get a flight from London Heathrow Airport to Seattle on Finnair for under £700?
London Heathrow Airport to Seattle flights on Finnair are currently available under £700. 8 flights have been found by Cheapflights users under that amount. To find flights for your dates, click here.
How do most travelers feel about Finnair?
The general consensus from 544 Cheapflights users is that Finnair is a 7.0/10. Select your travel dates above for updated prices on flights from London Heathrow Airport to Seattle (LHR-SEA).

Find Finnair flight deals from Heathrow to Seattle

Cheapest Finnair flights from Heathrow to Seattle
Explore the most affordable Finnair flight options available from Heathrow to Seattle. Find the lowest fares with prices last updated on 17 September 2025.

Wed 1/1010:30LHR - SEA

1 stop18h 53mFinnair

Sun 5/1000:34SEA - LHR

2 stops21h 46mFinnair

Deal found 15/9£445

Tue 14/1008:20LHR - SEA

1 stop16h 34mFinnair

Sun 19/1000:34SEA - LHR

1 stop22h 46mFinnair

Deal found 14/9£466

Wed 8/1010:30LHR - SEA

1 stop16h 57mFinnair

Mon 13/1000:34SEA - LHR

1 stop25h 56mFinnair

Deal found 15/9£469

Best Finnair flights from Heathrow to Seattle
Discover carefully curated Finnair flight deals from Heathrow to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 September 2025.

Tue 24/215:35LHR - SEA

2 stops26h 48mFinnair

Tue 3/320:00SEA - LHR

2 stops28h 35mFinnair

Deal found 15/9£445

Tue 2/1210:35LHR - SEA

2 stops34h 03mFinnair

Tue 9/1209:00SEA - LHR

1 stop15h 15mFinnair

Deal found 16/9£446

Sat 22/1112:30LHR - SEA

1 stop17h 54mFinnair

Sun 23/1100:59SEA - LHR

1 stop23h 16mFinnair

Deal found 14/9£474

Direct Finnair flights from Heathrow to Seattle
Explore direct Finnair flight options from Heathrow to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 17 September 2025.

Mon 6/1009:50LHR - SEA

Nonstop9h 45mFinnair

Fri 10/1013:30SEA - LHR

Nonstop9h 20mFinnair

Deal found 15/9£967

Thu 9/1016:30LHR - SEA

Nonstop9h 50mFinnair

Sun 19/1020:20SEA - LHR

Nonstop9h 20mFinnair

Deal found 15/9£2,019

Fri 10/1009:50LHR - SEA

Nonstop9h 45mFinnair

Sun 19/1020:20SEA - LHR

Nonstop9h 20mFinnair

Deal found 15/9£2,153

Last-minute Finnair flights from Heathrow to Seattle
Discover last-minute Finnair flight deals from Heathrow to Seattle. Data last updated 17 September 2025 and is based on user searches.

Wed 1/1010:30LHR - SEA

1 stop18h 53mFinnair

Sun 5/1000:34SEA - LHR

2 stops21h 46mFinnair

Deal found 15/9£445

Tue 14/1008:20LHR - SEA

1 stop16h 34mFinnair

Sun 19/1000:34SEA - LHR

1 stop22h 46mFinnair

Deal found 14/9£466

Wed 8/1010:30LHR - SEA

1 stop16h 57mFinnair

Mon 13/1000:34SEA - LHR

1 stop25h 56mFinnair

Deal found 15/9£469

Travel insights for Finnair flights from Heathrow to Seattle

Get recent, data-driven insights about Finnair flights from Heathrow to Seattle including ideal travel times, pricing trends, and more.

Prices

Airlines

What is the cheapest month to book a flight from London Heathrow Airport to Seattle with Finnair?

Currently, the most affordable month to book a Finnair flight from London Heathrow Airport to Seattle in February, with an average price of £321. Conversely, traveling with Finnair from London Heathrow Airport to Seattle in December will be the most expensive, with an average cost of £776. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

Best time to book a flight from Heathrow to Seattle

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

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.

Browse thousands of different options on Cheapflights for your next trip

See what others are saying about Finnair

Finnair

7.6

Good

1,324 reviews

Check prices

Overview

Recent reviews

8.0

Very Good|Jul 2025

It was okay

2.0

Poor|Jun 2025

They stranded us in the airport

10.0

Wonderful|May 2025

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

10.0

Wonderful|May 2025

This is a very short flight. The crew was all very friendly and helpful. The plane was clean and nice. By the time you're in the air, you're starting to descend. It's painless.

6.0

Okay|May 2025

Difficult to say what I liked, cabin crew very miserable, looked like they were sick of the job and it was their 50th flight if the day, long wait between drinks and food was somewhat very budget. We did travel in economy but with such a long flight you'd expect this type of service with Ryanair for a two/three hour flight to benidorm, not 8 hours over the Altantic.. entertainment was limited with films and difficult to hear even with headphones on. I think the pilot spoke once and I couldn't hear him over the noise in the cabin. I'd say to say you get what you pay for but my opinion I've flown with a much better airlines. Sorry...you dud ask :(

1 out of 442

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Finnair flights from London Heathrow Airport to Seattle (LHR - SEA)

Cheapflights users flying from London to Seattle on Finnair typically fly into Seattle/Tacoma Intl and depart from London Heathrow. Select your dates above for pricing.

Finnair flights from Heathrow to Seattle in 2025

Find detailed information about Finnair flights from Heathrow to Seattle. Explore the options provided by Finnair to plan your journey from Heathrow to Seattle. Data last updated 17 September 2025.

One-way from

Return from

Popular in

Cheapest in

Average price (all airlines)

Can I get a flight from London Heathrow Airport to Seattle on Finnair for under £700?

How do most travelers feel about Finnair?

Find Finnair flight deals from Heathrow to Seattle

Cheapest Finnair flights from Heathrow to SeattleExplore the most affordable Finnair flight options available from Heathrow to Seattle. Find the lowest fares with prices last updated on 17 September 2025.

Explore the most affordable Finnair flight options available from Heathrow to Seattle. Find the lowest fares with prices last updated on 17 September 2025.

Travel insights for Finnair flights from Heathrow to Seattle

Get recent, data-driven insights about Finnair flights from Heathrow to Seattle including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from London Heathrow Airport to Seattle with Finnair?

Weekly Finnair flight availability from London Heathrow Airport to Seattle

Rainfall in Seattle by month

Temperature in Seattle by month

Best time to book a flight from Heathrow to Seattle

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

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.

Fly from Heathrow to Seattle on another airline

Consider alternative airlines that service the Seattle area. Flight routes are based on user searches made on Cheapflights and were last updated on 17 September 2025.

See what others are saying about Finnair

Overview

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Cheapest Finnair flights from Heathrow to Seattle
Explore the most affordable Finnair flight options available from Heathrow to Seattle. Find the lowest fares with prices last updated on 17 September 2025.