Currently, the most affordable month to book a Frontier flight from Ontario to Seattle in January, with an average price of $247. Conversely, traveling with Frontier from Ontario to Seattle in July 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
$294
May
$321
June
$406
July
$408
August
$342
September
$278
October
$256
November
$258
December
$247
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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