Cheap flights from San Francisco Bay Area to Los Angeles from $59

In general, May is the cheapest month to fly from San Francisco Bay Area to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $117. If you aren’t able to travel during the month of May, then book flights to Ontario from San Francisco Bay Area during June instead. Flights to Ontario in June, while not as cheap as those in May, still average around $148.

The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $143. 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 San Francisco Bay Area to Ontario for around $195.

In the evening is the cheapest time of day to fly from San Francisco Bay Area 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 at noon when prices are $277 on average. Flights to Ontario from San Francisco Bay Area at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from San Francisco to Ontario for the best San Francisco Bay Area - Ontario flight prices

You are more likely to see cheaper flights to Ontario from San Francisco Bay Area when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $188 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from San Francisco Bay Area for as low as $132 on momondo.

There are 4 cabin classes available to choose from on San Francisco Bay Area 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, Southwest, and United Airlines are the most popular carriers operating from San Francisco Bay Area to Ontario

Alaska Airlines, Frontier and Southwest are the top three most popular airlines that fly to Ontario from San Francisco Bay Area 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.

3 flights are operational daily from San Francisco Bay Area to Ontario as of March 2026. The most popular departure time for this route is 4:00PM, with 42% of flights per day taking off in the afternoon.

As of March 2026, 27 flights take off from San Francisco Bay Area and land in Ontario each week. The most common flight departure day for this route is Wed, with 56% of weekly flights taking off on this day.