Cheap flights from Oakland, California to Los Angeles from $106

In general, August is the cheapest month to fly from Oakland, California to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $205. If you aren’t able to travel during the month of August, then book flights to Ontario from Oakland, California during May instead. Flights to Ontario in May, while not as cheap as those in August, still average around $217.

The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $147. 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 Oakland, California to Ontario for around $202.

In the evening is the cheapest time of day to fly from Oakland, California to Ontario when you can find flight prices for as low as $136. 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 $242 on average. Flights to Ontario from Oakland, California in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Oakland to Ontario for the best Oakland - Ontario flight prices

You are more likely to see cheaper flights to Ontario from Oakland, California when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $277 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Oakland, California for as low as $198 on momondo.

There is only 1 cabin class available to choose from on Oakland to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Southwest and Delta are the most popular carriers operating from Oakland to Ontario

Alaska Airlines, Southwest and Frontier are the top three most popular airlines that fly to Ontario from Oakland, California according to our data. Alaska Airlines is the first choice among our users, with 27% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 12 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

The number of flights available between Oakland, California and Ontario is 2 per day as of March 2026. The most frequent departure time is 6:00AM, with 43% of daily flights leaving at noon.

The number of flights available between Oakland, California and Ontario is 20 per week as of March 2026. The most frequent departure day is Sun, with 25% of weekly flights leaving on this day.