How do most travelers feel about Finnair?

When planning your LON-SEA trip, keep in mind that Finnair is typically rated 7.0/10. This rating comes from 546 reviews by Cheapflights users who have traveled with Finnair.

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

Cheapflights currently has 11 LON-SEA flights for under £700. Flights to Seattle will vary based on many factors, like date and time. Click here to find the best price for your dates on Cheapflights.

£388+ Finnair Flights from London 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 London to Seattle in 2025

One-way from	£388
Return from	£447
Popular in	August
Cheapest in	January
Average price (all airlines)	£512

Finnair
3/11
Nonstop
10h 00m total
London to Seattle

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Finnair
3/11-16/11
3 total stops
74h 16m total
London to Seattle

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

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

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

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Can I get a flight from London to Seattle on Finnair for under £700?
Cheapflights currently has 11 LON-SEA flights for under £700. Flights to Seattle will vary based on many factors, like date and time. Click here to find the best price for your dates on Cheapflights.
How do most travelers feel about Finnair?
When planning your LON-SEA trip, keep in mind that Finnair is typically rated 7.0/10. This rating comes from 546 reviews by Cheapflights users who have traveled with Finnair.

Find Finnair flight deals from London to Seattle

Cheapest Finnair flights from London to Seattle
Explore the most affordable Finnair flight options available from London to Seattle. Find the lowest fares with prices last updated on 12 settembre 2025.

mer 8/1009:15LHR - SEA

1 stop18h 55mFinnair

lun 20/1000:34SEA - LHR

1 stop22h 46mFinnair

Deal found 12/9£447

mer 17/912:30LHR - SEA

1 stop17h 34mFinnair

mer 24/913:50SEA - LHR

1 stop14h 55mFinnair

Deal found 10/9£448

mar 28/1010:05LHR - SEA

1 stop18h 43mFinnair

mar 18/1100:41SEA - LHR

2 stops21h 39mFinnair

Deal found 12/9£449

Best Finnair flights from London to Seattle
Discover carefully curated Finnair flight deals from London to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 settembre 2025.

lun 10/1111:45LHR - SEA

1 stop16h 54mFinnair

dom 16/1100:59SEA - LHR

1 stop23h 16mFinnair

Deal found 11/9£447

mar 2/1210:35LHR - SEA

2 stops32h 00mFinnair

mar 9/1207:15SEA - LHR

1 stop15h 35mFinnair

Deal found 12/9£447

mer 8/1009:15LHR - SEA

1 stop18h 55mFinnair

lun 20/1000:34SEA - LHR

1 stop22h 46mFinnair

Deal found 12/9£447

Direct Finnair flights from London to Seattle
Explore direct Finnair flight options from London to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 12 settembre 2025.

mar 2/1209:25LHR - SEA

Nonstop10h 05mFinnair

gio 15/118:50SEA - LHR

Nonstop9h 30mFinnair

Deal found 11/9£500

lun 2/314:55LHR - SEA

Nonstop10h 00mFinnair

ven 13/319:50SEA - LHR

Nonstop9h 30mFinnair

Deal found 11/9£530

dom 1/314:55LHR - SEA

Nonstop10h 00mFinnair

dom 8/319:50SEA - LHR

Nonstop9h 30mFinnair

Deal found 11/9£560

Last-minute Finnair flights from London to Seattle
Discover last-minute Finnair flight deals from London to Seattle. Data last updated 12 settembre 2025 and is based on user searches.

mer 8/1009:15LHR - SEA

1 stop18h 55mFinnair

lun 20/1000:34SEA - LHR

1 stop22h 46mFinnair

Deal found 12/9£447

mer 17/912:30LHR - SEA

1 stop17h 34mFinnair

mer 24/913:50SEA - LHR

1 stop14h 55mFinnair

Deal found 10/9£448

mar 28/1010:05LHR - SEA

1 stop18h 43mFinnair

mar 18/1100:41SEA - LHR

2 stops21h 39mFinnair

Deal found 12/9£449

Travel insights for Finnair flights from London to Seattle

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

How far ahead should I book a flight from London to Seattle with Finnair?

Booking with Finnair 55 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, the most affordable month to book a Finnair flight from London to Seattle in February, with an average price of £323. Conversely, traveling with Finnair from London to Seattle in December will be the most expensive, with an average cost of £781. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

Weekly Finnair flight availability from London to Seattle

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

Rainfall in Seattle by month

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.

Temperature in Seattle by month

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).

Best time to book a flight from London to Seattle

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

1,323 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 441

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Finnair flights from London to Seattle (LON - 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 London to Seattle in 2025

Find detailed information about Finnair flights from London to Seattle. Explore the options provided by Finnair to plan your journey from London to Seattle. Data last updated 12 settembre 2025.

One-way from

Return from

Popular in

Cheapest in

Average price (all airlines)

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

How do most travelers feel about Finnair?

Find Finnair flight deals from London to Seattle

Cheapest Finnair flights from London to SeattleExplore the most affordable Finnair flight options available from London to Seattle. Find the lowest fares with prices last updated on 12 settembre 2025.

Explore the most affordable Finnair flight options available from London to Seattle. Find the lowest fares with prices last updated on 12 settembre 2025.

Travel insights for Finnair flights from London to Seattle

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

How far ahead should I book a flight from London to Seattle with Finnair?

Use this chart to determine the optimal time to book a return flight from London to Seattle. Price data was last updated on 5 September 2025.

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

Weekly Finnair flight availability from London to Seattle

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

Best time to book a flight from London to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from London 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 London 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 12 settembre 2025.

See what others are saying about Finnair

Overview

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Travel Smart

Cheapest Finnair flights from London to Seattle
Explore the most affordable Finnair flight options available from London to Seattle. Find the lowest fares with prices last updated on 12 settembre 2025.