Cheap flights from Chicago O'Hare Intl Airport to Los Angeles from $69

In general, June is the cheapest month to fly from Chicago O'Hare Intl Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $317. If you aren’t able to travel during the month of June, then book flights to Ontario from Chicago O'Hare Intl Airport during May instead. Flights to Ontario in May, while not as cheap as those in June, still average around $328.

The cheapest day to depart on your flight to Ontario is on a Wednesday when prices can be found for as low as $437. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Chicago O'Hare Intl Airport to Ontario for around $620.

At noon is the cheapest time of day to fly from Chicago O'Hare Intl Airport to Ontario when you can find flight prices for as low as $379. Flying to Ontario at noon 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 afternoon when prices are $542 on average. Flights to Ontario from Chicago O'Hare Intl Airport in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Chicago O'Hare Intl to Ontario for the best Chicago O'Hare Intl - Ontario flight prices

You are more likely to see cheaper flights to Ontario from Chicago O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $416 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Chicago O'Hare Intl Airport for as low as $227 on momondo.

You could potentially save up to 8% on your flight if you consider stops on a Chicago O'Hare Intl Airport to Ontario flight.

As of May 2026, prices for Chicago O'Hare Intl Airport to Ontario flights are approximately 92% more expensive when compared to flights at the same time last year.

Delta, United Airlines, and Alaska Airlines are the most popular carriers operating from Chicago O'Hare Intl to Ontario

American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Ontario from Chicago O'Hare Intl Airport according to our data. American Airlines is the first choice among our users, with 39% 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.

Denver (DEN) was the most common stop: 40% 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 $152.

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 5h 51m.

Phoenix (PHX) has the shortest average layover time for this route: 0h 53m.

As of May 2026, 1 flights take off from Chicago O'Hare Intl Airport and land in Ontario each day. The most common flight departure time for this route is 3:00PM, with 50% of daily flights taking off in the afternoon.

As of May 2026, 7 flights take off from Chicago O'Hare Intl Airport and land in Ontario each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.