Cheap Flights from Ontario Intl. Airport (ONT) to Chicago (ORD)

View AU$154 flight on Tue, 11 Aug 2026Opens in a new window

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

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Cheap Flights from Ontario Intl. Airport (ONT) to Chicago (ORD)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, 13 Aug - Wed, 19 Aug
ONT
Ontario
ORD
Chicago
AU$486 Return, found 3 days ago
AU$486
Return
found 3 days ago
Select Delta flight, departing Thu, 13 Aug from Ontario to Chicago, returning Wed, 19 Aug, priced at AU$486 found 3 days ago
American Airlines
Thu, 13 Aug - Wed, 19 Aug
ONT
Ontario
ORD
Chicago
AU$555 Return, found 3 days ago
AU$555
Return
found 3 days ago
Select American Airlines flight, departing Thu, 13 Aug from Ontario to Chicago, returning Wed, 19 Aug, priced at AU$555 found 3 days ago
United
Thu, 13 Aug - Wed, 19 Aug
ONT
Ontario
ORD
Chicago
AU$614 Return, found 3 days ago
AU$614
Return
found 3 days ago
Select United flight, departing Thu, 13 Aug from Ontario to Chicago, returning Wed, 19 Aug, priced at AU$614 found 3 days ago
Delta
Thu, 13 Aug - Wed, 19 Aug
ONT
Ontario
ORD
Chicago
AU$626 Return, found 3 days ago
AU$626
Return
found 3 days ago
Select Delta flight, departing Thu, 13 Aug from Ontario to Chicago, returning Wed, 19 Aug, priced at AU$626 found 3 days ago
American Airlines
Thu, 13 Aug - Wed, 19 Aug
ONT
Ontario
ORD
Chicago
AU$693 Return, found 3 days ago
AU$693
Return
found 3 days ago
Select American Airlines flight, departing Thu, 13 Aug from Ontario to Chicago, returning Wed, 19 Aug, priced at AU$693 found 3 days ago
American Airlines
Thu, 13 Aug - Wed, 19 Aug
ONT
Ontario
ORD
Chicago
AU$695 Return, found 3 days ago
AU$695
Return
found 3 days ago
Select American Airlines flight, departing Thu, 13 Aug from Ontario to Chicago, returning Wed, 19 Aug, priced at AU$695 found 3 days ago
Delta
Thu, 13 Aug - Wed, 19 Aug
ONT
Ontario
ORD
Chicago
AU$724 Return, found 3 days ago
AU$724
Return
found 3 days ago
Select Delta flight, departing Thu, 13 Aug from Ontario to Chicago, returning Wed, 19 Aug, priced at AU$724 found 3 days ago
United
Thu, 13 Aug - Wed, 19 Aug
ONT
Ontario
ORD
Chicago
AU$725 Return, found 3 days ago
AU$725
Return
found 3 days ago
Select United flight, departing Thu, 13 Aug from Ontario to Chicago, returning Wed, 19 Aug, priced at AU$725 found 3 days ago
Delta
Sat, 9 May - Sun, 10 May
ONT
Ontario
ORD
Chicago
AU$923 Return, found 3 days ago
AU$923
Return
found 3 days ago
Select Delta flight, departing Sat, 9 May from Ontario to Chicago, returning Sun, 10 May, priced at AU$923 found 3 days ago

Frequently asked questions

What is the cheapest month to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
August is typically the cheapest month to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.), with average return fares of approximately 481 AUD. This is about 18% lower than the average price throughout the year. August often sees lower prices as the peak summer travel season begins to wind down, and families prepare for the new school year. Other cheap months to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) include June and September.
Which airlines fly direct from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
Enter ONT to ORD and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
To find a cheap flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
The best airline to fly with from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) will differ from traveller to traveller. If you like to fly early, UA offers early morning flights. If price is the most important factor, UA typically offers the lowest fares. AS offers the most daily flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
The best time to fly from Los Angeles - Ontario Intl. (ONT) to O'Hare Intl. (ORD) is typically August or September. While we don't have specific data on popularity for these months, they are historically the cheapest times to fly, with average return flights costing around 481 AUD. This can be a great time to find a good deal as summer travel winds down and before the holiday rush begins.
How many flights per day from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
There are approximately 2 nonstop flights per day from Los Angeles - Ontario Intl. (ONT) to O'Hare Intl. (ORD). For even more choice, look at flights that include layovers, as there are around 48 connecting flights per day. Some common connection points include Seattle - Tacoma Intl. (SEA), Dallas-Fort Worth Intl. (DFW), and Portland Intl. (PDX).
What is the earliest flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
The earliest flight from Los Angeles - Ontario Intl. (ONT) to O'Hare Intl. (ORD) typically departs at approximately 12:45 AM local time, operated by F9. This is a seasonal service active in April. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
You'll typically find the most flights from Los Angeles - Ontario Intl. (ONT) to O'Hare Intl. (ORD) on a Friday, with around 39 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include American Airlines, Alaska Airlines, and United Airlines. Flight options are notably more on Fridays compared to other days of the week.
What are the most popular departure times for flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
The most popular departure times for flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) are in the morning, from 6am to 9am. Around 32% of passengers reckon this time's best. Heaps of major carriers, including American Airlines and United Airlines, offer flights during this window. This timing works well for many travellers as it allows for an early start to your journey, getting you to your destination with plenty of the day left.
How long does it take to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
A nonstop flight from ONT to ORD typically takes around 4 hours, covering approximately 1,696 miles. Connecting flights on this route usually add 5 hours to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
Select the "Business class" and "First class" filters when looking for ONT to ORD flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) flight with Expedia?
It's easy to earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Chicago from Los Angeles - Ontario Intl. (ONT)?
From Los Angeles - Ontario Intl. (ONT), you can fly into Midway Intl. (MDW) and O'Hare Intl. (ORD) in Chicago. Some flights may connect through major hubs like McCarran Intl. (LAS), Sky Harbor Intl. (PHX), Denver Intl. (DEN) before reaching Chicago. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) at the last minute?
Typically, booking a last minute flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) flight and hotel package?
Securing a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.)?
If you booked your Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Chicago, IL (ORD-O'Hare Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Los Angeles - Ontario Intl.
Destination airport
O'Hare Intl.
Return price
AU$486
Distance
2713 km
Average flight time
8 hours 14 mins

Book with confidence

Your quick guide to flights from Ontario Intl. Airport to Chicago

Pick up great flights from Ontario Intl. Airport to Chicago

With Expedia, you have your pick of flights a day with 20 airlines covering flights from Ontario Intl. Airport to Chicago. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from Ontario Intl. Airport to Chicago that take around hours.

Find cheap flights from Ontario Intl. Airport to Chicago

From the great flight deals with prices currently ranging from AU$486 to AU$923, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from Ontario Intl. Airport to Chicago around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to Chicago is normally in August.

Reasons to book your flight from Ontario Intl. Airport to Chicago with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from Ontario Intl. Airport to Chicago across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to Chicago right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Your quick guide to flights from Ontario Intl. Airport to Chicago

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