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

LHR — SEA
15 Mar — 22 Mar1
1 adult
1 adult, Economy, 0 bags

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 13 February 2026.

One-way from

£340

Return from

£545

Popular in

July

Cheapest in

February

Average price (all airlines)

£494
Finnair
  • Finnair
  • 15/4
  • 2 total stops
  • 20h 18m total
  • London to Seattle
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Finnair
  • Finnair
  • 13/4-23/4
  • 3 total stops
  • 47h 26m total
  • London to Seattle
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Highest demand for flights from London Heathrow to Seattle/Tacoma Intl; 11% 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 1,362 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 £513?

    London Heathrow Airport to Seattle flights on Finnair are currently available under £513. 7 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

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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 13 February 2026.

Tue 10/315:35
LHR
-
SEA
2 stops25h 58m
Finnair
Tue 17/306:44
SEA
-
LHR
1 stop17h 06m
Finnair
Deal found 13/2£555
Tue 10/314:55
LHR
-
SEA
Nonstop10h 00m
Finnair
Tue 31/305:30
SEA
-
LHR
1 stop16h 50m
Finnair
Deal found 10/2£557
Tue 24/214:55
LHR
-
SEA
Nonstop10h 00m
Finnair
Tue 3/306:00
SEA
-
LHR
1 stop17h 20m
Finnair
Deal found 10/2£560

Weekly Finnair flight availability from London Heathrow Airport to Seattle

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

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.

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See what others are saying about Finnair

Read reviews and see what other travellers are saying about their experiences with Finnair. Get insights from real passengers regarding the airline's services, customer satisfaction, and overall travel experience. Use these reviews to inform your decision when choosing Finnair for your next flight. Reviews last updated 13 February 2026.
Finnair
7.6
Good
1,362 reviews
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Overview

Food

6.7

Comfort

7.4

Entertainment

6.9

Boarding

7.7

Crew

8.2

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