Currently, the most affordable month to book a Finnair flight from London Heathrow Airport to Seattle in December, with an average price of £594. Conversely, traveling with Finnair from London Heathrow Airport to Seattle in July will be the most expensive, with an average cost of £802. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
January
£487
February
£479
March
£505
April
£519
May
£554
June
£610
July
£639
August
£608
September
£546
October
£524
November
£479
December
£473
SEA Temperature | 5 - 19 °C |
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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).
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