Cheap flights from Houston to Los Angeles from $72

In general, August is the cheapest month to fly from Houston to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $173. If you aren’t able to travel during the month of August, then book flights to Ontario from Houston during September instead. Flights to Ontario in September, while not as cheap as those in August, still average around $184.

The cheapest day to depart on your flight to Ontario is on a Thursday when prices can be found for as low as $340. 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 Houston to Ontario for around $473.

At noon is the cheapest time of day to fly from Houston to Ontario when you can find flight prices for as low as $217. 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 evening when prices are $341 on average. Flights to Ontario from Houston in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

Fly from Houston George Bush Intcntl to Ontario for the best Houston - Ontario flight prices

You are more likely to see cheaper flights to Ontario from Houston when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $270 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Houston for as low as $164 on momondo.

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

Frontier and Southwest are the most popular carriers operating from Houston to Ontario

Frontier, United Airlines and Delta are the top three most popular airlines that fly to Ontario from Houston according to our data. Frontier is the first choice among our users, with 44% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 6 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

1 flights are operational daily from Houston to Ontario as of August 2026. The most popular departure time for this route is 6:00AM, with 52% of flights per day taking off in the afternoon.

8 flights are operational weekly from Houston to Ontario as of August 2026. The most popular departure day for this route is Tue, with 38% of flights per week taking off on this day.