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 9 July 2025.
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 9 July 2025.
Explore the most affordable Finnair flight options available from London to Seattle. Find the lowest fares with prices last updated on 9 July 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 4 July 2025.
Booking with Finnair 53 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 £322. Conversely, traveling with Finnair from London to Seattle in December will be the most expensive, with an average cost of £520. 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 Sunday, which is when the least amount of flights are scheduled (1 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 London to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from London with our price prediction graph.
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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 9 July 2025.
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 9 July 2025.
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