Cheap flights from Oregon to Los Angeles from $93

In general, January 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 $255. If you aren’t able to travel during the month of January, then book flights to Ontario from Oregon during February instead. Flights to Ontario in February, while not as cheap as those in January, still average around $256.

The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $283. This is often the case because there is less demand to fly during this day of the week. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Oregon to Ontario for around $358.

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 $268. 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 $330 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 $291 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 $230 on momondo.

There are 4 cabin classes available to choose from on Oregon to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

Alaska Airlines, Delta and Frontier 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 62% 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.

1 flights are operational daily from Oregon to Ontario as of September 2026. The most popular departure time for this route is 7:00AM, with 60% of flights per day taking off in the afternoon.

The number of flights available between Oregon and Ontario is 12 per week as of September 2026. The most frequent departure day is Mon, with 25% of weekly flights leaving on this day.