How do most travelers feel about Finnair?

The general consensus from 1,376 Cheapflights users is that Finnair is a 7.7/10. 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 £605?

London Heathrow Airport to Seattle flights on Finnair are currently available under £605. 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 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).

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).

£434+ 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	£434
Return from	£523
Popular in	July
Cheapest in	February
Average price (all airlines)	£573

Finnair
30/9
Nonstop
9h 45m total
London to Seattle

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Finnair
16/6-25/6
1 total stop
25h 45m 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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How do most travelers feel about Finnair?
The general consensus from 1,376 Cheapflights users is that Finnair is a 7.7/10. 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 £605?
London Heathrow Airport to Seattle flights on Finnair are currently available under £605. 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

Best

Direct

Last-minute

One-way

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 3 April 2026.

Mon 18/509:50

LHR

SEA

Nonstop9h 45m

Finnair

Mon 1/620:20

SEA

LHR

Nonstop9h 25m

Finnair

Deal found 3/4£561

Mon 18/509:50

LHR

SEA

Nonstop9h 45m

Finnair

Thu 4/613:30

SEA

LHR

Nonstop9h 15m

Finnair

Deal found 31/3£568

Tue 19/509:45

LHR

SEA

1 stop20h 53m

Finnair

Fri 5/613:30

SEA

LHR

Nonstop9h 15m

Finnair

Deal found 3/4£595

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 June, with an average price of £453. Conversely, traveling with Finnair from London Heathrow Airport to Seattle in February will be the most expensive, with an average cost of £880. 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.

LHR-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.

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Finnair

7.7

Good

1,376 reviews

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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 3 April 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 £605?

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 3 April 2026.

Explore the most affordable Finnair flight options available from Heathrow to Seattle. Find the lowest fares with prices last updated on 3 April 2026.

Best Finnair flights from Heathrow to SeattleDiscover 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 3 April 2026.

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 3 April 2026.

Direct Finnair flights from Heathrow to SeattleExplore 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 3 April 2026.

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 3 April 2026.

Last-minute Finnair flights from Heathrow to SeattleDiscover last-minute Finnair flight deals from Heathrow to Seattle. Data last updated 3 April 2026 and is based on user searches.

Discover last-minute Finnair flight deals from Heathrow to Seattle. Data last updated 3 April 2026 and is based on user searches.

One-way Finnair flights to SeattleSearch for one-way Finnair flight options to Seattle. Find affordable one-way fares based on user searches. Data last updated 3 April 2026.

Search for one-way Finnair flight options to Seattle. Find affordable one-way fares based on user searches. Data last updated 3 April 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.

Other Finnair flights from Heathrow

Browse through other Finnair flights departing from Heathrow. Flight routes are based on user searches made on Cheapflights and were last updated on 3 April 2026.

Complete your trip

Complete your trip to Seattle by adding a car hire and/or hotel booking to your travel itinerary.

Other airlines servicing Heathrow and Seattle

Choose from other airlines serving Heathrow and Seattle.

Other popular destinations in North America

If Seattle is not for you, choose from these other destinations located in North America. Flight routes are based on user searches made on Cheapflights and were last updated on 3 April 2026.

Popular flights with Finnair

Browse through some of the most popular routes that Finnair offers at this time. Flights are based on user searches made on Cheapflights and were last updated on 3 April 2026.

See what others are saying about Finnair

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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 3 April 2026.

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 3 April 2026.

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 3 April 2026.

Last-minute Finnair flights from Heathrow to Seattle
Discover last-minute Finnair flight deals from Heathrow to Seattle. Data last updated 3 April 2026 and is based on user searches.

One-way Finnair flights to Seattle
Search for one-way Finnair flight options to Seattle. Find affordable one-way fares based on user searches. Data last updated 3 April 2026.