Cheap flights from Austin to Los Angeles from $71

In general, August is the cheapest month to fly from Austin to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $285. If you aren’t able to travel during the month of August, then book flights to Ontario from Austin during September instead. Flights to Ontario in September, while not as cheap as those in August, still average around $285.

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $348. 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 Austin to Ontario for around $550.

In the afternoon is the cheapest time of day to fly from Austin to Ontario when you can find flight prices for as low as $404. 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 in the morning when prices are $467 on average. Flights to Ontario from Austin in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Austin Bergstrom to Ontario for the best Austin Bergstrom - Ontario flight prices

You are more likely to see cheaper flights to Ontario from Austin when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $351 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Austin for as low as $262 on momondo.

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

You could potentially save up to 15% on your flight if you consider stops on a Austin to Ontario flight.

As of March 2026, prices for Austin to Ontario flights are approximately 4% more expensive when compared to flights at the same time last year.

Southwest, Delta, and United Airlines are the most popular carriers operating from Austin Bergstrom to Ontario

American Airlines, Delta and Southwest are the top three most popular airlines that fly to Ontario from Austin according to our data. American 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 8 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

Phoenix (PHX) was the most common stop: 88% of momondo users choosing 1-stop flights on this route connected there.

Flights via Las Vegas (LAS) offer the lowest average round-trip price of $279.

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 4h 57m.

Phoenix (PHX) has the shortest average layover time for this route: 1h 00m.

The number of flights available between Austin and Ontario is 1 per day as of March 2026. The most frequent departure time is 7:00PM, with 66% of daily flights leaving in the evening.

As of March 2026, 9 flights take off from Austin and land in Ontario each week. The most common flight departure day for this route is Mon, with 22% of weekly flights taking off on this day.