Currently, the most affordable month to book a Alaska Airlines flight from Chicago to Seattle in December, with an average price of $245. Conversely, traveling with Alaska Airlines from Chicago to Seattle in June will be the most expensive, with an average cost of $408. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.
January
$247
February
$254
March
$288
April
$291
May
$319
June
$408
July
$406
August
$343
September
$278
October
$256
November
$258
December
$245
SEA Temperature | 41 - 66.2 °F |
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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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).
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