Cheap flights from Oregon to Los Angeles from $89

In general, November is the cheapest month to fly from Oregon to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $34. If you aren’t able to travel during the month of November, then book flights to Ontario from Oregon during October instead. Flights to Ontario in October, while not as cheap as those in November, still average around $35.

The cheapest day to depart on your flight to Ontario is on a Friday when prices can be found for as low as $195. This is often the case because there is less demand to fly during this day of the week. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Oregon to Ontario for around $286.

In the evening is the cheapest time of day to fly from Oregon to Ontario when you can find flight prices for as low as $191. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $300 on average. Flights to Ontario from Oregon in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Portland to Ontario for the best Oregon - Ontario flight prices

You are more likely to see cheaper flights to Ontario from Oregon when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $229 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Oregon for as low as $179 on momondo.

Frontier, Delta, and Alaska Airlines are the most popular carriers operating from Oregon to Ontario

Alaska Airlines, Frontier and Delta are the top three most popular airlines that fly to Ontario from Oregon according to our data. Alaska Airlines is the first choice among our users, with 60% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 11 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

4 flights are operational daily from Oregon to Ontario as of May 2026. The most popular departure time for this route is 9:00PM, with 50% of flights per day taking off in the evening.

The number of flights available between Oregon and Ontario is 33 per week as of May 2026. The most frequent departure day is Wed, with 18% of weekly flights leaving on this day.