Currently, the most affordable month to book a Icelandair flight from Seattle to London in November, with an average price of $653. Conversely, traveling with Icelandair from Seattle to London in June will be the most expensive, with an average cost of $1,158. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
January
$673
February
$663
March
$715
April
$692
May
$735
June
$1,158
July
$980
August
$776
September
$743
October
$710
November
$653
December
$671
LON Temperature | 39.2 - 62.6 °F |
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If weather is an important factor for your trip to London, 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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).
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