How do most travelers feel about Finnair?

The general consensus from 1,346 Cheapflights users is that Finnair is a 7.6/10. 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 £521?

London Heathrow Airport to Seattle flights on Finnair are currently available under £521. 10 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 Tuesday (2 on average). You will have fewer Finnair flight options on Monday, 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).

£379+ 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 2026

One-way from	£376
Return from	£399
Popular in	July
Cheapest in	February
Average price (all airlines)	£507

Finnair
29/4
Nonstop
9h 45m total
London to Seattle

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Finnair
25/5-1/6
1 total stop
39h 05m total
London to Seattle

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Highest demand for flights from London Heathrow to Seattle/Tacoma Intl; 13% 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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How do most travelers feel about Finnair?
The general consensus from 1,346 Cheapflights users is that Finnair is a 7.6/10. 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 £521?
London Heathrow Airport to Seattle flights on Finnair are currently available under £521. 10 flights have been found by Cheapflights users under that amount. To find flights for your dates, click here.

Find Finnair flight deals from Heathrow to Seattle

Enter your travel dates to find the best prices.

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 9 January 2026.

Tue 13/108:20LHR - SEA

1 stop21h 27mFinnair

Tue 20/108:35SEA - LHR

1 stop14h 15mFinnair

Deal found 7/1£404

Mon 23/216:55LHR - SEA

1 stop37h 53mFinnair

Fri 6/313:35SEA - LHR

Nonstop9h 35mFinnair

Deal found 7/1£485

Sun 22/208:20LHR - SEA

1 stop19h 09mFinnair

Fri 6/313:35SEA - LHR

Nonstop9h 35mFinnair

Deal found 7/1£515

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 9 January 2026.

Wed 8/715:00LHR - SEA

1 stop29h 10mFinnair

Tue 21/723:58SEA - LHR

1 stop28h 17mFinnair

Deal found 8/1£407

Tue 7/712:15LHR - SEA

1 stop19h 44mFinnair

Mon 27/713:35SEA - LHR

Nonstop9h 15mFinnair

Deal found 7/1£412

Wed 1/407:30LHR - SEA

2 stops23h 34mFinnair

Tue 7/407:00SEA - LHR

1 stop17h 05mFinnair

Deal found 9/1£419

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 9 January 2026.

Mon 20/409:50LHR - SEA

Nonstop9h 45mFinnair

Fri 24/413:35SEA - LHR

Nonstop9h 15mFinnair

Deal found 7/1£438

Mon 4/509:50LHR - SEA

Nonstop9h 45mFinnair

Fri 8/513:35SEA - LHR

Nonstop9h 15mFinnair

Deal found 7/1£439

Fri 10/409:50LHR - SEA

Nonstop9h 45mFinnair

Mon 20/413:35SEA - LHR

Nonstop9h 15mFinnair

Deal found 7/1£457

Last-minute Finnair flights from Heathrow to Seattle
Discover last-minute Finnair flight deals from Heathrow to Seattle. Data last updated 9 January 2026 and is based on user searches.

Tue 13/108:20LHR - SEA

1 stop21h 27mFinnair

Tue 20/108:35SEA - LHR

1 stop14h 15mFinnair

Deal found 7/1£404

Mon 23/216:55LHR - SEA

1 stop37h 53mFinnair

Fri 6/313:35SEA - LHR

Nonstop9h 35mFinnair

Deal found 7/1£485

Sun 22/208:20LHR - SEA

1 stop19h 09mFinnair

Fri 6/313:35SEA - LHR

Nonstop9h 35mFinnair

Deal found 7/1£515

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 March, with an average price of £396. Conversely, traveling with Finnair from London Heathrow Airport to Seattle in February will be the most expensive, with an average cost of £896. 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

1,346 reviews

Check prices

Overview

Recent reviews

4.0

Mediocre|Sept 2025

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.

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.

1 out of 449

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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 2026

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 9 January 2026.

One-way from

Return from

Popular in

Cheapest in

Average price (all airlines)

How do most travelers feel about Finnair?

Can I get a flight from London Heathrow Airport to Seattle on Finnair for under £521?

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 9 January 2026.

Explore the most affordable Finnair flight options available from Heathrow to Seattle. Find the lowest fares with prices last updated on 9 January 2026.

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 9 January 2026.

See what others are saying about Finnair

Overview

100% Free

Book with Flexibility

Travel Smart

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 9 January 2026.