$85 Cheap Flights from Chicago (MDW) to Ontario (ONT)

View $85 flight on Fri, Oct 24, 2025Opens in a new window

Popular airlines from Chicago Midway Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)

Cheap Flights from Chicago to Ontario (MDW-ONT)

Prices were available within the past 7 days and start at $85 for one-way flights and $168 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, Oct 24 - Fri, Oct 31
MDW
Chicago
ONT
Ontario
$168 Roundtrip, found 1 day ago
$168
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Oct 24 from Chicago to Ontario, returning Fri, Oct 31, priced at $168 found 1 day ago
Frontier Airlines
Thu, Oct 30 - Mon, Nov 10
MDW
Chicago
ONT
Ontario
$170 Roundtrip, just found
$170
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Oct 30 from Chicago to Ontario, returning Mon, Nov 10, priced at $170 just found
Frontier Airlines
Thu, Oct 30 - Thu, Nov 6
MDW
Chicago
ONT
Ontario
$188 Roundtrip, just found
$188
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Oct 30 from Chicago to Ontario, returning Thu, Nov 6, priced at $188 just found
Frontier Airlines
Thu, Oct 16 - Thu, Oct 23
MDW
Chicago
ONT
Ontario
$196 Roundtrip, found 1 day ago
$196
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Oct 16 from Chicago to Ontario, returning Thu, Oct 23, priced at $196 found 1 day ago
Frontier Airlines
Fri, Oct 24 - Sun, Oct 26
MDW
Chicago
ONT
Ontario
$206 Roundtrip, found 5 hours ago
$206
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Fri, Oct 24 from Chicago to Ontario, returning Sun, Oct 26, priced at $206 found 5 hours ago
Frontier Airlines
Fri, Oct 24 - Fri, Oct 31
MDW
Chicago
ONT
Ontario
$228 Roundtrip, found 1 day ago
$228
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Oct 24 from Chicago to Ontario, returning Fri, Oct 31, priced at $228 found 1 day ago
Frontier Airlines
Fri, Oct 10 - Mon, Oct 20
MDW
Chicago
ONT
Ontario
$233 Roundtrip, found 1 day ago
$233
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Oct 10 from Chicago to Ontario, returning Mon, Oct 20, priced at $233 found 1 day ago
Frontier Airlines
Thu, Oct 30 - Sun, Nov 9
MDW
Chicago
ONT
Ontario
$234 Roundtrip, just found
$234
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Oct 30 from Chicago to Ontario, returning Sun, Nov 9, priced at $234 just found
Southwest Airlines
Tue, Nov 11 - Thu, Nov 13
MDW
Chicago
ONT
Ontario
$254 Roundtrip, found 2 days ago
$254
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Tue, Nov 11 from Chicago to Ontario, returning Thu, Nov 13, priced at $254 found 2 days ago
Delta
Tue, Nov 18 - Thu, Nov 20
MDW
Chicago
ONT
Ontario
$417 Roundtrip, found 20 hours ago
$417
Roundtrip
found 20 hours ago
Select Delta flight, departing Tue, Nov 18 from Chicago to Ontario, returning Thu, Nov 20, priced at $417 found 20 hours ago

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

February is typically the cheapest month to fly

From $118 - $518 per traveler.

Alternative airports near Ontario

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

Select flight to John Wayne SNA. Cheapest option available. Average driving time to city center is 42 minutes. Flights from $423
SNA
John Wayne
Cheapest
Average driving time to city center42 min
Flights from $423
Flights from Chicago (MDW) to Ontario (ONT)
Origin airport
Midway Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Delta, Frontier Airlines, Southwest Airlines
Roundtrip price
$168
Distance
1702 mi
Average flight time
3 hours 30 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 October. 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 $85 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 Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Get a cheap one-way flight from $85 or cheap return flight from $168 from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)?
Planning your getaway for October can help you save, as it's the cheapest month for flights between MDW and ONT. You'll typically find the lowest prices during the off-season.
Which airlines fly direct from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)?
Catch a direct flight with Southwest Airlines and fly straight from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT).
What is the cheapest airline that flies from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest MDW to ONT flight.
How many flights per day from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)?
On average, there are 6 nonstop flights flying from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT) per week. If you can't find one that fits your travel plans, consider a flight with a layover. Customize your search on Expedia to include one or two stops and choose the next best option.
What are the most popular departure times for flights from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)?
The 9 AM departures from MDW to ONT are the top choice for many travelers. Greater demand means you'll likely pay more for these departures. If you want to save on your trip, book during off-peak hours.
What day of the week has the most flights from MDW to ONT?
Fly on a Friday if you're after the largest selection of flights from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT).
What is the earliest flight from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)?
Midway Intl. Airport (MDW)'s first flight to Los Angeles - Ontario Intl. Airport (ONT) leaves at approximately 9:00AM UTC-6. With a travel time of 4h 30m, you'll touch down at around 11:30AM UTC-8.
How long does it take to fly from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)?
Typically, it takes 4 hours and 31 minutes to fly the 1,700 mi from MDW to ONT.
What airline has the least delays from MDW to ONT?
Consider booking with Southwest Airlines if you'd like to fly straight from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT) without any delays. This airline has the strongest track record for punctuality, with an on-time score of 83%. Want to be notified if anything changes? You can check your flight status using the Expedia App.
What is the best time to fly from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)?
To avoid possible delays on the Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT) route, travel before 3 PM. Departures after this time have a 22% higher chance of being 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 Midway Intl. Airport (MDW)?
Midway Intl. Airport (MDW) offers direct flights to Ontario. Here are some of the airports you can fly to without stops:

  • Los Angeles Intl. Airport (LAX)
  • Long Beach Municipal Airport (LGB)
  • Los Angeles - Ontario Intl. Airport (ONT)

Is it cheaper to buy a plane ticket from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Last-minute bookings from MDW to ONT are typically more expensive. For the cheapest rates, start looking for flights ahead of time. That being said, if you can play around with your travel dates, it's possible to find a cheap fare just before your departure.
Is it cheaper to book a MDW to ONT flight and hotel package?
Compared with arranging hotels and flights separately, booking a MDW to ONT flight and hotel package with Expedia could result in significant savings. Better yet, having everything in one easy place will take the stress out of planning your trip. Just pick your flights and choose from our wide range of stays, then customize your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Midway Intl. Airport (MDW) to Los Angeles - Ontario Intl. Airport (ONT)?
In most cases, you're able to cancel or reschedule your MDW to ONT flight. However, additional fees may apply, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and guidelines on flight changes, or if you want further details, visit our Customer Service portal.

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*Available to One Key members.