Price observed over the last 3 months for a round trip.

Cheapest flight tickets
Price observed over the last 3 months for a round trip.
Average price of a round trip
Average flight ticket price recorded over the last 3 months for a round trip.
Flight duration
A flight from Seattle to Ontario takes on average 2h50.
Best time
According to user searches, the ideal month to go to Ontario is November.
Check out our tips for booking your flight to Ontario (USA) from Seattle (USA) at the cheapest possible price.
Usually, the cheapest month to pick up a ticket on this route is December, with an average flight ticket price of $73 (calculation over the last two years). The most touristic season corresponds to the months of December, November and October.
For the cheapest flights, it is advisable to buy your ticket at least 21 days before the departure date.
The airline offering the cheapest flight tickets is Frontier Airlines. A ticket from the airline Frontier Airlines to Ontario costs on average $193.
The airlines that offer the most flights are Alaska Airlines, Frontier Airlines and Alaska Airlines.
Here is some information and tips to know before booking your flight:
Seattle is a city in the country USA, the time zone is [[timezone]]. In Seattle, it is currently {fromLocalTime}, the temperature is on average 17°C, with a minimum of 11°C and a maximum of 24°C.
The city of Seattle (SEA) has 4 airport(s): Kenmore Air Harbor Spb., Seattle-Tacoma, Renton and King County
Ontario is in the country USA, the time zone is [[timezone]]. In Ontario, it is currently {toLocalTime}, the temperature is on average 28°C, with a minimum of 23°C and a maximum of 33°C.
The city of Ontario has 4 airport(s): Ontario, Cable, Chino and Brackett Field
If you want to visit Ontario during the least touristic period, choose the month of November.
In Ontario, the most popular month is December. It is during this period that the prices offered by airlines are also the highest.
According to our data, it is recommended to book your flight 21 days before your departure. If you book your flight ticket 4 weeks before your departure, you may find a price below average. The cheapest day to book a flight from Seattle to Ontario is Saturday.
When you leave, you can leave from Seattle-Tacoma, and you will arrive at Los Angeles International or Ontario.
The airport Kenmore Air Harbor Spb. is located 3 km, Seattle-Tacoma is located 16 km, Renton is located 16 km or King County is located 8 km from the city centre. You can access it by using public transportation, taking a taxi, or renting a car.
Airplane is the only means of transportation listed on Liligo for this journey.
In summer, the average temperature is 25°C in Ontario and 18°C in Seattle. The average rainfall in summer is 4 mm in Ontario and 38 mm in Seattle. In summer, it is warmer in Ontario and it rains less in Ontario. In winter, it is colder in Ontario and it rains more in Seattle.