Cheap flights from San Jose, California to Los Angeles from $69

In general, August 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 $244. If you aren’t able to travel during the month of August, then book flights to Ontario from San Jose, California during June instead. Flights to Ontario in June, while not as cheap as those in August, still average around $247.

The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $247. 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 Jose, California to Ontario for around $379.

In the afternoon is the cheapest time of day to fly from San Jose, California to Ontario when you can find flight prices for as low as $279. Flying to Ontario in the afternoon 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 $359 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 $282 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 $209 on momondo.

No. A direct flight is the cheapest option for a flight between San Jose, California to Ontario.

As of April 2026, prices for San Jose, California to Ontario flights are approximately 172% more expensive when compared to flights at the same time last year.

Southwest is the most popular carrier 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 28% 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.

The number of flights available between San Jose, California and Ontario is 2 per day as of April 2026. The most frequent departure time is 10:00AM, with 56% of daily flights leaving at noon.

18 flights are operational weekly from San Jose, California to Ontario as of April 2026. The most popular departure day for this route is Mon, with 22% of flights per week taking off on this day.