Cheap flights from Oakland, California to Los Angeles from $44

In general, September 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 $278. If you aren’t able to travel during the month of September, then book flights to Ontario from Oakland, California during May instead. Flights to Ontario in May, while not as cheap as those in September, still average around $289.

The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $166. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Oakland, California to Ontario for around $261.

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 $196. 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 at noon when prices are $255 on average. Flights to Ontario from Oakland, California at noon 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 $324 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 $210 on momondo.

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

Southwest is the most popular carrier 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 28% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 10 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 1 per day as of October 2026. The most frequent departure time is 6:00AM, with 50% of daily flights leaving at noon.

The number of flights available between Oakland, California and Ontario is 12 per week as of October 2026. The most frequent departure day is Mon, with 33% of weekly flights leaving on this day.