$114 Cheap Flights from Chicago (ORD) to Ontario (ONT)

View $114 flight on Thu, Jun 26, 2025Opens in a new window

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

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Find available prices by choosing your travel dates.

Cheap Flights from Chicago to Ontario (ORD-ONT)

Prices were available within the past 7 days and start at $114 for one-way flights and $198 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, May 2 - Tue, May 20
ORD
Chicago
ONT
Ontario
$198 Roundtrip, found 9 hours ago
$198
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Fri, May 2 from Chicago to Ontario, returning Tue, May 20, priced at $198 found 9 hours ago
Frontier Airlines
Thu, May 1 - Tue, May 20
ORD
Chicago
ONT
Ontario
$218 Roundtrip, found 9 hours ago
$218
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Thu, May 1 from Chicago to Ontario, returning Tue, May 20, priced at $218 found 9 hours ago
United
Tue, May 27 - Thu, May 29
ORD
Chicago
ONT
Ontario
$224 Roundtrip, found 16 hours ago
$224
Roundtrip
found 16 hours ago
Select United flight, departing Tue, May 27 from Chicago to Ontario, returning Thu, May 29, priced at $224 found 16 hours ago
United
Wed, Aug 27 - Sun, Sep 7
ORD
Chicago
ONT
Ontario
$227 Roundtrip, just found
$227
Roundtrip
just found
Select United flight, departing Wed, Aug 27 from Chicago to Ontario, returning Sun, Sep 7, priced at $227 just found
Frontier Airlines
Fri, May 16 - Sun, May 18
ORD
Chicago
ONT
Ontario
$228 Roundtrip, just found
$228
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, May 16 from Chicago to Ontario, returning Sun, May 18, priced at $228 just found
Southwest Airlines
Mon, Jul 21 - Sun, Jul 27
ORD
Chicago
ONT
Ontario
$233 Roundtrip, found 2 hours ago
$233
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Mon, Jul 21 from Chicago to Ontario, returning Sun, Jul 27, priced at $233 found 2 hours ago
Frontier Airlines
Fri, May 9 - Tue, May 20
ORD
Chicago
ONT
Ontario
$233 Roundtrip, found 5 days ago
$233
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Fri, May 9 from Chicago to Ontario, returning Tue, May 20, priced at $233 found 5 days ago
United
Thu, Jul 24 - Tue, Jul 29
ORD
Chicago
ONT
Ontario
$237 Roundtrip, just found
$237
Roundtrip
just found
Select United flight, departing Thu, Jul 24 from Chicago to Ontario, returning Tue, Jul 29, priced at $237 just found
Delta
Tue, May 27 - Thu, May 29
ORD
Chicago
ONT
Ontario
$238 Roundtrip, found 16 hours ago
$238
Roundtrip
found 16 hours ago
Select Delta flight, departing Tue, May 27 from Chicago to Ontario, returning Thu, May 29, priced at $238 found 16 hours ago
American Airlines
Wed, Jun 25 - Sun, Jun 29
ORD
Chicago
ONT
Ontario
$246 Roundtrip, found 5 hours ago
$246
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Wed, Jun 25 from Chicago to Ontario, returning Sun, Jun 29, priced at $246 found 5 hours ago

Frequently asked questions

How much does a flight from O'Hare Intl. Airport (ORD) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Discover the latest flight deals from ORD to ONT by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
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 $114. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from ORD on July 19 2025. Prices were last updated on April 23 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.
*Available to One Key members.