Finnair flights from London Heathrow Airport to Seattle (LHR - SEA)
LHR — SEA
14 Nov — 21 Nov1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
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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 15 October 2026.
Sat 28/1109:25 -
Nonstop10h 00m
Wed 2/1207:30 -
1 stop20h 40m
Deal found 15/10£596
Mon 23/1114:55 -
Nonstop9h 55m
Sun 6/1210:27 -
1 stop15h 33m
Deal found 12/10£597
Thu 26/1114:55 -
Nonstop9h 55m
Thu 3/1207:30 -
1 stop20h 40m
Deal found 12/10£642
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 15 October 2026.
Sat 28/1109:25 -
Nonstop10h 00m
Tue 8/1207:30 -
1 stop20h 40m
Deal found 15/10£596
Sat 28/1109:25 -
Nonstop10h 00m
Wed 2/1207:30 -
1 stop20h 40m
Deal found 15/10£596
Mon 23/1114:55 -
Nonstop9h 55m
Sun 6/1210:27 -
1 stop15h 33m
Deal found 12/10£597
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 15 October 2026.
Thu 29/1009:25 -
Nonstop10h 00m
Wed 11/1118:45 -
Nonstop9h 25m
Deal found 11/10£650
Thu 24/1209:25 -
Nonstop10h 00m
Fri 1/118:45 -
Nonstop9h 25m
Deal found 11/10£889
Fri 25/1214:55 -
Nonstop9h 55m
Fri 1/118:45 -
Nonstop9h 25m
Deal found 11/10£923
Last-minute Finnair flights from Heathrow to Seattle
Discover last-minute Finnair flight deals from Heathrow to Seattle. Data last updated 15 October 2026 and is based on user searches.
Sat 28/1109:25 -
Nonstop10h 00m
Wed 2/1207:30 -
1 stop20h 40m
Deal found 15/10£596
Mon 23/1114:55 -
Nonstop9h 55m
Sun 6/1210:27 -
1 stop15h 33m
Deal found 12/10£597
Thu 26/1114:55 -
Nonstop9h 55m
Thu 3/1207:30 -
1 stop20h 40m
Deal found 12/10£642
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 15 October 2026.
Sun 14/314:55 -
Nonstop9h 55m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 12/10£431
Fri 13/1114:55 -
Nonstop9h 55m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 11/10£575
Sat 28/1109:25 -
Nonstop10h 00m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 13/10£576
Can I get a flight from London Heathrow Airport to Seattle on Finnair for under £603?
London Heathrow Airport to Seattle flights on Finnair are currently available under £603. 1 flights have been found by Cheapflights users under that amount. To find flights for your dates, click here.
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 15 October 2026.
Which month is the cheapest to fly Economy class from London Heathrow Airport to Seattle?
For Economy class flights, the cheapest month to fly this route is January. The most expensive months are May and March.
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 Monday, which is when the least amount of flights are scheduled (2 on average).
Rainfall in Seattle by month
Plan your trip to Seattle by taking into account the average rainfall totals 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
Plan your trip to Seattle by taking into account the average temperature totals 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 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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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 15 October 2026.
Browse through other Finnair flights departing from Heathrow. Flight routes are based on user searches made on Cheapflights and were last updated on 15 October 2026.
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 15 October 2026.
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 15 October 2026.
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 15 October 2026.
The flight from Helsinki to Toronto was very cramped. No leg space and no room to even walk. Very bad experience
8.0
Very Good|Jul 2026
Very limited food provided. Limited drinks, lights out for 10 of 12.30 flights. Very few staff.
2.0
Poor|Jun 2026
Lost our luggage and took two days to get it back. Ruined the trip.
10.0
Wonderful|Jun 2026
Our checked baggage was not transferred correctly so now we are stuck in Budapest with out essential luggage. We are not able to get much help from FinnAir because their service from Seattle is on periodic.
10.0
Wonderful|May 2026
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