Currently, the most affordable month to book a Finnair flight from London to Seattle in December, with an average price of £583. Conversely, traveling with Finnair from London to Seattle in July will be the most expensive, with an average cost of £799. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
January
£481
February
£469
March
£499
April
£513
May
£531
June
£604
July
£630
August
£605
September
£540
October
£518
November
£473
December
£460
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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