CHI - ONT

$60 Find Cheap Flights from Chicago to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Chicago to Ontario departing on 5/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Chicago to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Chicago to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$162
Typical prices: $485-$249
Frontier
Fri 5/15Mon 5/18
ORD - ONT • 1 stop
Cheapest non-stop
$263
Southwest
Wed 5/27Tue 6/2
MDW - ONT • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
United's Economy Plus offers extra legroom benefits.
ONT provides budget-friendly public transport options.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $162 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Southwest and United Airlines. Average duration is 4h 22m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top routes
Cheapest • 8% average savings
Most popular
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $148 (round-trip)
Shortest trip • 6h 35m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 34% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Chicago to Ontario (CHI-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Chicago to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Chicago to Ontario

Fri, May 15 - Mon, May 18
Frontier Logo
9:37 pm - 10:05 am
ORD
-
ONT
14h 28m
1 stop
Frontier Logo
8:06 pm - 11:01 pm
ONT
-
ORD
24h 55m
1 stop
$162Frontier
Tue, May 12 - Tue, May 19
Frontier Logo
12:40 pm - 7:11 pm
ORD
-
ONT
8h 31m
1 stop
Frontier Logo
6:00 am - 8:32 pm
ONT
-
ORD
12h 32m
1 stop
$180Frontier
Sat, May 23 - Tue, May 26
Frontier Logo
9:37 pm - 10:05 am
ORD
-
ONT
14h 28m
1 stop
Frontier Logo
8:06 pm - 11:01 pm
ONT
-
ORD
24h 55m
1 stop
$185Frontier
Sat, May 16 - Tue, May 19
Frontier Logo
4:05 pm - 7:35 am
ORD
-
ONT
17h 30m
1 stop
Frontier Logo
6:00 am - 8:32 pm
ONT
-
ORD
12h 32m
1 stop
$191Frontier
Tue, May 19 - Tue, May 26
Frontier Logo
9:37 pm - 10:05 am
ORD
-
ONT
14h 28m
1 stop
Frontier Logo
8:06 pm - 11:01 pm
ONT
-
ORD
24h 55m
1 stop
$196Frontier
Tue, May 19 - Tue, May 26
Multiple Airlines Logo
4:06 pm - 7:35 am
ORD
-
ONT
17h 29m
1 stop
Multiple Airlines Logo
8:06 pm - 11:01 pm
ONT
-
ORD
24h 55m
1 stop
$209Multiple Airlines
Wed, May 27 - Tue, Jun 2
Southwest Logo
6:10 am - 9:50 am
MDW
-
ONT
5h 40m
1 stop
Southwest Logo
11:55 pm - 5:40 am
ONT
-
MDW
3h 45mnonstop
$229Southwest
Wed, May 27 - Tue, Jun 2
Southwest Logo
6:10 am - 11:35 am
MDW
-
ONT
7h 25m
1 stop
Southwest Logo
2:10 pm - 10:00 pm
ONT
-
MDW
5h 50m
1 stop
$239Southwest
Wed, May 27 - Tue, Jun 2
Delta Logo
9:23 am - 4:17 pm
MDW
-
ONT
8h 54m
2 stops
Delta Logo
12:07 pm - 9:09 pm
ONT
-
MDW
7h 02m
1 stop
$242Delta
Wed, May 27 - Tue, Jun 2
Delta Logo
9:23 am - 4:17 pm
MDW
-
ONT
8h 54m
2 stops
Delta Logo
6:00 am - 5:56 pm
ONT
-
MDW
9h 56m
2 stops
$247Delta
Booking Insights

KAYAK's insights & trends for Chicago to Ontario flights

Get data-powered insights and trends into flights from Chicago to Ontario to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Chicago to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Chicago to Ontario departing in May.

What is the cheapest Chicago to Ontario flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The absolute cheapest return flight from Chicago to Ontario costs $263 on the route between Chicago O'Hare Intl Airport (ORD) and Ontario (ONT). However, over the past month, flights between Chicago Midway Airport (MDW) and Ontario (ONT) were, on average, 8% cheaper than other Chicago-Ontario routes. The most popular route is between Chicago O'Hare Intl Airport (ORD) and Ontario (ONT).

What’s the cheapest day of the week to fly from Chicago to Ontario?

The average price of all round-trip flights from Chicago to Ontario clicked on KAYAK for each day over the last 12 months.

For Chicago to Ontario, Wednesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Ontario back to Chicago, the best deals are generally found on Wednesday, with Sunday being the most expensive.

What is the cheapest month to fly from Chicago to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Chicago to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Chicago to Ontario is April, where tickets cost $99 (return) on average. On the other hand, the most expensive months are November and January, where the average cost of round-trip tickets is $188 and $182 respectively.

Can I save money by flying with a layover from Chicago to Ontario?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $333 on average.

Expert advice

Expert advice for your flight from Chicago to Ontario

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Stefanie Waldek

Stefanie Waldek

Expert on United Airlines, ORD and MDW

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Good to know

Low seasonJanuary
Cheapest flight$60
Best time to beat the crowds but there is an average 30% increase in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from Chicago O'Hare Airport to Ontario

When to book flights from Chicago to Ontario

Are your dates flexible? Find out the best times to travel from Chicago to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Chicago to Ontario

  • What are the most common layover airports for flights from Chicago to Ontario?

    Some of the most typical layover airports for various airlines traveling from Chicago to Ontario are Phoenix Sky Harbor International Airport (PHX), Dallas/Fort Worth International Airport (DFW), and Denver International Airport (DEN). If you are flying with American Airlines, your layover airports will be PHX or DFW. DEN, on the other hand, serves as a layover airport for Frontier aircraft.

  • Which airline(s) should I book if I am to travel with my pet(s) from Chicago to Ontario?

    Although most airlines flying from Chicago to Ontario allow pets, booking with Alaska Airlines has a number of advantages for pet owners. When compared to other airlines on this route, Alaska features some of the lowest pet fees. Furthermore, pets are permitted to travel in-cabin as long as their combined weight with that of the carrier does not exceed 20 lbs.

  • Can I get an eco-friendly flight from Chicago to Ontario?

    Yes. Several airlines operating from Chicago to Ontario - including Delta, American Airlines, and Spirit Airlines - provide environmentally friendly flights between Chicago and Ontario. Among them, American Airlines leads the list as one of the most environmentally friendly airlines because of its carbon reduction projects, which aim to equip all of its planes with fuel-efficient engines.

  • Which airline(s) among those flying from Chicago to Ontario have an option to upgrade from economy to first class?

    Delta Airlines, American Airlines, and Spirit Airlines are among the airlines where you can upgrade to first class by adding a nominal fee to your ticket. By taking advantage of this opportunity, you can fly first class at a lower rate than if you booked first class directly.

  • What is the cheapest flight from Chicago to Ontario?

    In the last 3 days, the lowest price for a flight from Chicago to Ontario was $60 for a one-way ticket and $162 for a round-trip.

  • Do I need a passport to fly between Chicago and Ontario?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from Chicago to Ontario?

    On your way to Ontario, you’ll fly out from one of these Chicago airports: Chicago Midway or Chicago O'Hare Intl. You’ll be landing at Ontario.

  • Which airlines offer Wi-Fi service onboard planes from Chicago to Ontario?

    American Airlines, JetBlue, and Alaska Airlines offer inflight Wi-Fi service on the Chicago to Ontario flight route.

  • Which aircraft models fly most regularly from Chicago to Ontario?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Chicago to Ontario flight route.

  • Which airline alliances offer flights from Chicago to Ontario?

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between Chicago and Ontario, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from Chicago to Ontario?

    There are nonstop flights from Chicago to Ontario on a daily basis.

  • Which is the best airline for flights from Chicago to Ontario, Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from Chicago to Ontario are Southwest and United Airlines. With an average price for the route of $532 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $528 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Chicago to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Chicago to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Chicago to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Chicago is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Chicago to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Chicago with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Chicago to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Chicago up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Chicago to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $265 or less one-way and $431 or less round-trip.
  • Chicago O'Hare International Airport (ORD) is the primary departure airport for flights from Chicago to Ontario. However, just a few flights leave from Chicago Midway International Airport (MDW). You have a better chance of finding a cheaper flight fare if you choose a less popular route with MDW as the departing airport. Ontario International Airport (ONT) is the only airport serving all flights from Chicago to Ontario.
  • When traveling from Downtown Chicago to ORD to catch a trip to Ontario, CTA Blue Line buses are the most cost-effective and dependable mode of transportation. However, if you are in a hurry, consider taking cabs - which are the quickest mode of transportation.
  • Booking with American Airlines or United Airlines, both of which use ORD as their hub, gives you the assurance of getting a flight that fits your schedule. This is due to the fact that both airlines operate the most daily flights from Chicago ORD to Ontario.
  • Consider flying Delta or American Airlines from Chicago to Ontario with your child(ren). Because of the big seats and extra legroom in all American Airlines cabins, you and your children will travel in luxury. Furthermore, both Delta and American Airlines give priority boarding to parents traveling with their children.
  • When you book a trip from Chicago to Ontario, you will have the option of connecting to a variety of different cities covered by ONT. Upland, Montclair, and Chino - just a few of the cities with easy access from Ontario International Airport.

Prefer to fly direct from Chicago to Ontario?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Chicago to Ontario.
Find which airlines fly direct from Chicago to Ontario Airport, which days they fly and book direct flights.

Direct departures

Chicago to Ontario

Monday

Southwest,United Airlines

Southwest,United Airlines

Tuesday

Southwest,United Airlines

Southwest,United Airlines

Wednesday

Southwest,United Airlines

Southwest,United Airlines

Thursday

Southwest,United Airlines

Southwest,United Airlines

Friday

Southwest,United Airlines

Southwest,United Airlines

Saturday

Southwest,United Airlines

Southwest,United Airlines

Sunday

Southwest,United Airlines

Southwest,United Airlines

See more direct flights

Direct returns

Ontario to Chicago

Monday

Southwest,United Airlines

Southwest,United Airlines

Tuesday

Southwest,United Airlines

Southwest,United Airlines

Wednesday

Southwest,United Airlines

Southwest,United Airlines

Thursday

Southwest,United Airlines

Southwest,United Airlines

Friday

Southwest,United Airlines

Southwest,United Airlines

Saturday

Southwest,United Airlines

Southwest,United Airlines

Sunday

Southwest,United Airlines

Southwest,United Airlines

See more direct flights

Reviews of the top 3 airlines serving from Chicago to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Chicago to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Chicago to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4314 reviews
8.6Crew
8.0Comfort
7.0Food
8.1Boarding
7.5Entertainment
Airline reviews

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

8.0 ExcellentCheryl, Apr 2026
DEN - SBA
Read more Southwest reviews

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The charges were ridiculous for an hour flight and the turbulence was very scary.

3 hour delay. Had to change plans and was still delayed.

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

Several missed and almost missed connections. It felt like everything was being patched together last minute without enough resources and it ended up being an extremely stressful experience that basically ruined our weekend on the west coast. What a waste.

Crew was friendly. Seats are too narrow, particularly when a big person is in the adjacent seat, but I understand this is due to smaller planes usually flight into Lincoln. I have experienced several flight delays going out and coming into Lincoln airport, I say maybe 50% or higher of the flights I've taken out of this airport have been delayed.

Great flight. Boarded efficiently. Arrived early at CLT. There was no in flight entertainment on this aircraft. Great crew.

The seat was comfortable. There was a lot of turbulence. If it weren't for that,it would have been okay.

Poor communication, flight was delayed for preventable reasons. I missed my connection.

No meal service to the back of the plane as it started late or was too slow to get it out before it was time to land.

Terrible, if possible won't be flying again anytime soon!

Plane was hot and miserable and the crew was rude!

12 hour delay required getting on and off plane 3 times - would have at least liked to have been offered a snack or drink

They didn’t offer a water, even after I asked

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Better than expected. Staff were friendly and nice on both flights.

Everything you need to know for your flight from Chicago to Ontario

Information on your arrival and departure airports