Cheap flights from San Jose, California to Los Angeles from $48

In general, October is the cheapest month to fly from San Jose, California to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $196. If you aren’t able to travel during the month of October, then book flights to Ontario from San Jose, California during September instead. Flights to Ontario in September, while not as cheap as those in October, still average around $203.

The cheapest day to depart on your flight to Ontario is on a Thursday when prices can be found for as low as $279. 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 San Jose, California to Ontario for around $416.

In the morning is the cheapest time of day to fly from San Jose, California to Ontario when you can find flight prices for as low as $317. Flying to Ontario in the morning 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 $565 on average. Flights to Ontario from San Jose, California at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from San Jose to Ontario for the best San Jose - Ontario flight prices

You are more likely to see cheaper flights to Ontario from San Jose, California when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $284 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from San Jose, California for as low as $206 on momondo.

There is only 1 cabin class available to choose from on San Jose, 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 and United Airlines are the most popular carriers operating from San Jose to Ontario

Southwest, Frontier and United Airlines are the top three most popular airlines that fly to Ontario from San Jose, California according to our data. Southwest is the first choice among our users, with 30% 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 San Jose, California and Ontario is 1 per day as of October 2026. The most frequent departure time is 6:00AM, with 46% of daily flights leaving at noon.

12 flights are operational weekly from San Jose, California to Ontario as of October 2026. The most popular departure day for this route is Mon, with 33% of flights per week taking off on this day.