$99 Cheap United flights Houston (IAH) to Ontario (ONT)

Finding cheap one-way United Airlines flights from IAH to ONT from $99 on Expedia couldn’t be easier — just filter by “Price (lowest to highest).” Or check out our budget-friendly return fares from $148 for your next exciting vacation.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

United Airlines flights to Ontario are often more affordable in the off-peak months of January and April. Whether you’re in search of a round-trip or one-way ticket, you could land a better deal then.

Search for cheap United Airlines flights from George Bush Intercontinental Airport (IAH) to Los Angeles - Ontario Intl. Airport (ONT) one to three months before your departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare type and itinerary, the best day to book a domestic flight is generally Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Choose from one of United Airlines’s 7 direct weekly flights from George Bush Intercontinental Airport (IAH) to Los Angeles - Ontario Intl. Airport (ONT). To see your choices, enter your origin, destination and dates and hit search. Then use the “Nonstop” and “Airline” filters.

Take off from George Bush Intercontinental Airport (IAH) for Los Angeles - Ontario Intl. Airport (ONT) on a nonstop United Airlines flight, and you’ll be airborne for around 3h 42m.

The first United Airlines flight from IAH to ONT takes off at 8:15PM UTC-6, landing at 9:57PM UTC-8. If you want to jet off later in the day, the last United Airlines flight leaves IAH at 8:15PM UTC-6 and touches down at ONT at 9:57PM UTC-8. Flying before midday is generally a smart option as morning flights are less likely to be canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

United Airlines flights from George Bush Intercontinental Airport (IAH) to Ontario land at Los Angeles - Ontario Intl. Airport (ONT), Los Angeles Intl. Airport (LAX) and John Wayne Airport (SNA). The primary Ontario hub served by this carrier is ONT. It’s worth checking out flights arriving at other nearby airports on Expedia as they may offer lower fares.

A rewarding loyalty program and the chance to rack up points through United Mileage Plus are the start of the reasons to fly from IAH to ONT with United Airlines. Plus, when you sign up to Expedia’s free One Key™ program, you can earn OneKeyCash™* in addition to United Airlines’s loyalty program earnings. It’s yours to spend on future bookings.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Set off on a United Airlines flight from George Bush Intercontinental Airport (IAH) to Los Angeles - Ontario Intl. Airport (ONT), and you’ll probably board a Boeing 737-800. Keep in mind though, that the aircraft type can vary due to operational demands.

Depending on the type of fare you purchased, a fee will generally apply if you cancel or change your booking more than 24 hours after confirmation. To find flexible plane tickets, select our “No cancel fee” or “Changes included” filter when you search for flights. To learn more about changing or canceling your reservation, go to “Trips,” select your flight and tick “Manage Booking.”