Alaska Airlines flights from Ontario to Seattle (ONT - SEA)

• Can I get a flight from Ontario to Seattle on Alaska Airlines for under $300?

  There are 13 flights available on Alaska Airlines from Ontario to Seattle for under $300. These prices can change based on many factors including date and time. To find ONT-SEA flight prices for your dates, click here.

• How do most travelers feel about Alaska Airlines?

  Alaska Airlines has received a 6.2/10 rating from 4,123 Cheapflights user reviews. If you wish to plan your next trip from Ontario to Seattle with Alaska Airlines, enter your preferred travel dates above!

Currently, the most affordable month to book a Alaska Airlines flight from Ontario to Seattle in December, with an average price of $244. Conversely, traveling with Alaska Airlines 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.

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).