$118 Cheap Flights from Chicago (ORD) to Ontario (ONT)

Popular airlines from Chicago O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Chicago to Ontario (ORD-ONT)

Prices were available within the past 7 days and start at $118 for one-way flights and $257 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Frontier Airlines
Frontier Airlines
American Airlines
Alaska Airlines
American Airlines
American Airlines
Frontier Airlines
American Airlines
Hawaiian Airlines

Find the cheapest month to fly from Chicago (ORD) to Ontario (ONT)

October is typically the cheapest month to fly

From $118 - $320 per traveler.

Graph displaying average flight prices per month

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Flights from Chicago (ORD) to Ontario (ONT)
Origin airport
O'Hare Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, JetBlue Airways, Southwest Airlines, United
Roundtrip price
$257
Distance
1695 mi
Average flight time
4 hours 31 mins

Chicago to Ontario Flights

The cheapest times to fly from Chicago to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Chicago to Ontario are during the month of November. You can find some of the cheapest flights from Chicago to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Chicago to Ontario

Sunday is one of the best days to book for cheap flights from Chicago to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Chicago to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Chicago to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $118 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Chicago to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Chicago to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Cheap round-trip fares from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT) start at $234. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a United and Spirit Airlines flight leaving ORD on August 11 2025 and touching down at ONT. The price was last updated on July 18 2025 and has not changed since.
What is the cheapest month to fly from ORD to ONT?
The cheapest flights from ORD to ONT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT)?
Direct flights aren't available from Chicago, IL (ORD-O'Hare Intl.) to Los Angeles - Ontario Intl. Airport (ONT). However, you can find other airports with nonstop flights. Start your journey at Midway Intl. Airport (MDW) and travel straight to Ontario without a layover.
What is the cheapest airline that flies from ORD to ONT?
Jet off from ORD to ONT with United. This carrier currently has the cheapest one-way ticket for this route, starting from $169. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from ORD on October 11 2025. Prices were last updated on July 18 2025 and have not changed since.
How many flights per day from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT)?
You'll need to take a flight with a layover if you're traveling from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from ORD to ONT?
You'll generally find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT)?
Select a flight from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT) that takes off before 3 PM to reduce the likelihood of delays. Departures later than this are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Ontario from O'Hare Intl. Airport (ORD)?
If you're catching a direct flight from O'Hare Intl. Airport (ORD) to Ontario, you can touch down at either Los Angeles Intl. Airport (LAX) or John Wayne Airport (SNA).
Is it cheaper to buy a plane ticket from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Holding off until right before your break to book your flight from ORD to ONT generally means paying more. While you may find some last-minute discounts, they're not always guaranteed. Be flexible with your itinerary to maximize your chances of getting a bargain.
Is it cheaper to book an ORD to ONT flight and hotel package?
Opting for an ORD to ONT flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Select from our wide range of stays and then add activities, flights and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT)?
In most instances, you can modify or cancel your ORD to ONT flight. However, there may be additional fees, especially if you booked over 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you need further information, visit our Customer Service portal.

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