Cheap flights from Houston to Los Angeles from $103

In general, November 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 $29. If you aren’t able to travel during the month of November, then book flights to Ontario from Houston during May instead. Flights to Ontario in May, while not as cheap as those in November, still average around $33.

The cheapest day to depart on your flight to Ontario is on a Thursday when prices can be found for as low as $350. 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 Houston to Ontario for around $431.

In the afternoon is the cheapest time of day to fly from Houston to Ontario when you can find flight prices for as low as $216. 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 evening when prices are $352 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 $267 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 $185 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.

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

Frontier, United Airlines and Spirit Airlines 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 37% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 7 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

4 flights are operational daily from Houston to Ontario as of May 2026. The most popular departure time for this route is 8:00PM, with 48% of flights per day taking off in the evening.

29 flights are operational weekly from Houston to Ontario as of May 2026. The most popular departure day for this route is Mon, with 21% of flights per week taking off on this day.