Cheap flights from California to Ontario from $148

The month of January is, on average, the cheapest month to fly to Region of Ontario from California, with most prices found around $394. If you aren’t able to travel during the month of January, then book flights to Region of Ontario from California during February instead. Flights to Region of Ontario in February, while not as cheap as those in January, still average around $395.

According to our data, Tuesday is the cheapest day to fly to Region of Ontario from California. The lowest ticket price found for a Tuesday departure recently was $548. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from California to Region of Ontario on a Sunday will generally be more expensive and average around $727. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

According to our data, the cheapest time of day to fly to Region of Ontario is at noon. momondo users have found flights departing from California to Region of Ontario at noon for as low as $489. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $661.

Fly from Los Angeles to Toronto Pearson Intl for the best California - Ontario flight prices

You are more likely to see cheaper flights to Region of Ontario from California when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around $479 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Ontario from California for as low as $430 on momondo.

There are 4 cabin classes available to choose from on California to Region of Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

United Airlines, Porter Airlines, and Delta are the most popular carriers operating from California to Ontario

Air Canada, Porter Airlines and United Airlines are the top three most popular airlines that fly to Region of Ontario from California according to our data. Air Canada is the first choice among our users, with 49% of people opting to fly with this airline when traveling to Region of Ontario. Keep in mind that there are 8 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

As of October 2026, 42 flights take off from California and land in Region of Ontario each day. The most common flight departure time for this route is 1:00PM, with 47% of daily flights taking off in the afternoon.

295 flights are operational weekly from California to Region of Ontario as of October 2026. The most popular departure day for this route is Fri, with 17% of flights per week taking off on this day.