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CHI - ONT

Find cheap flights from Chicago to Ontario from $51

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 5/22. 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
0 bags
Thu 5/23
Thu 5/30

Search 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
In the last 7 days travelers have searched 44,632,927 times on KAYAK, and here is why:

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Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
5:30 am - 11:59 pmMDW-ONT
20h 29m1 stop
12:59 am - 5:12 pmONT-MDW
14h 13m1 stop
$89Frontier
Find Deal
Tue, May 14 - Mon, May 20
10:55 pm - 6:26 amMDW-ONT
9h 31m1 stop
7:36 pm - 5:50 amONT-MDW
8h 14m1 stop
$90Frontier
Find Deal
Tue, May 14 - Wed, May 15
9:29 pm - 6:31 amMDW-ONT
11h 02m1 stop
5:41 pm - 5:50 amONT-MDW
10h 09m1 stop
$102Frontier
Find Deal
Sat, May 11 - Sat, May 18
10:30 am - 11:59 pmMDW-ONT
15h 29m1 stop
12:59 am - 10:05 pmONT-MDW
19h 06m1 stop
$103Frontier
Find Deal
Sat, May 11 - Mon, May 13
5:01 am - 5:00 pmMDW-ONT
13h 59m1 stop
12:59 am - 10:05 pmONT-MDW
19h 06m1 stop
$104Frontier
Find Deal
Thu, May 9 - Mon, May 13
10:59 pm - 7:03 amMDW-ONT
10h 04m1 stop
10:49 pm - 11:36 amONT-MDW
10h 47m1 stop
$106Frontier
Find Deal
Mon, May 13 - Tue, May 14
10:22 pm - 11:59 pmMDW-ONT
27h 37m1 stop
4:19 pm - 1:46 pmONT-MDW
19h 27m1 stop
$108Frontier
Find Deal
Thu, May 16 - Wed, May 22
5:01 am - 1:01 pmMDW-ONT
10h 00m1 stop
12:59 am - 11:38 amONT-MDW
8h 39m1 stop
$109Frontier
Find Deal
Tue, May 7 - Mon, May 13
7:45 am - 12:13 pmORD-ONT
6h 28m1 stop
5:45 am - 6:17 pmONT-ORD
10h 32m2 stops
$254Delta
Find Deal
Wed, May 29 - Tue, Jun 4
7:50 pm - 11:59 pmORD-ONT
6h 09m1 stop
1:20 pm - 9:32 pmONT-ORD
6h 12m1 stop
$305Delta
Find Deal
Wed, May 1 - Wed, Jun 5

Flights from Chicago to Ontario - Travel Insights & Trends

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.

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

The average price of all flights from Chicago to Ontario clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to Ontario on a Thursday and more expensive on a Sunday. On your return trip to Chicago, you should consider flying back on a Thursday, and avoid Mondays for better deals.

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 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 November, where tickets cost $209 on average. On the other hand, the most expensive months are March and July, where the average cost of tickets is $498 and $421 respectively.

How far in advance should I book a flight from Chicago to Ontario?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Chicago to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Chicago to Ontario, you should book around 3 days before departure. For the absolute cheapest price, our data suggests you should book 76 days before departure.

How many flights are there between Chicago and Ontario per day?

There is a maximum of 1 nonstop flight a day that takes off from Chicago and lands in Ontario, with an average flight time of 4h 10m. The most common departure time is 11:00 am and most flights take off in the morning. Each week, there are 7 flights.

How long does a flight from Chicago to Ontario take?

The duration of a nonstop flight to Ontario from Chicago is typically 4h 05m. The journey crosses a distance of 1,708 miles.

What’s the earliest departure time from Chicago to Ontario?

Early birds can take the earliest flight from Chicago at 9:40 am and will be landing in Ontario at 11:45 am.

What’s the latest departure time from Chicago to Ontario?

If you prefer to fly at night, the latest flight from Chicago to Ontario jets off at 4:10 pm and lands at 6:15 pm.

Good to know

Low season

January

High season

December

Cheapest flight

$51
Best time to beat the crowds with an average 31% drop in price.
Most popular time to fly and prices are also 8% lower on average.
Flight from Chicago Midway 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 $51 for a one-way ticket and $89 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 aircraft models fly most regularly from Chicago to Ontario?

    We unfortunately don’t have that data for this specific 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, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Chicago to Ontario are Delta and United Airlines. With an average price for the route of $464 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $463 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.

See more FAQs

Top tips for finding a cheap flight from Chicago to Ontario

  • 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.
See more tips

Prefer to fly non-stop from Chicago to Ontario?

Find which airlines fly direct from Chicago to Ontario, which days they fly and book direct flights.

Nonstop departures

Chicago to Ontario

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Nonstop returns

Ontario to Chicago

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights
See more direct flights

Top 5 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
DeltaOverall score based on 11028 reviews
8.2boarding
7.9comfort
8.6crew
8.0entertainment
7.5food
Airline reviews

There was a loud squeaky sound the whole time we were flying.

6.0 GoodEliza, Apr 2024SAN - LAX
Read more about Delta reviews

There was a loud squeaky sound the whole time we were flying.

Had a broken tray in business class. Crew just shrugged it off.

I didn’t like that I could not select my seat and was assigned a seat when I checked in at LAX

Great experience overall. Check in at Austin was congested as they only have about 6 check in kiosks, one was broken, and there was a lot of Spring Break travelers.

Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.

Everything was very good other than I had selected a specific seat when I booked the flight and they changed it once I checked-in the day before my flight. I was still in first class but lost my aisle seat for a window seat. Being tall, the aisle offers more comfort so I always select an aisle seat.

Flight diverted in SD. Later take off in Seattle by 1.3hrs

Horrible. Flight ORD to CGH was okay, but Paris was a nightmare. Old planes, delays, involuntary downgrades, broken planes, terrible communication. CGH to CPT was my worst flight ever.

Crew was not friendly when I went to request a seat change.

Really impressive staff at airport and on plane, especially given how busy it was

delay several times and wait extra long to board. no entertainment service because there are problem for some rows. always encounter some delays for the last flight of the day.

The flight experience was very good! Especially the United Club!

I was not able to buy food in the flight. They refer to include your Credit card in the APP, and if you are not from USA (i have a credit card form Canada) it is not possible

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

The flight from Ottawa to Chicago took a lot longer due to DC in Ottawa. We got to Chicago and went to our gate to catch our flight. We only had nine minutes I found that very stressful.

Good boarding. Crew started quick with drinks and food. They came around several times for trash which I really liked. Other than turbulence due to storms in the area, flight was great.

The control panel for the seat back screen did not work at all after takeoff.

Plane was so old it had cigarette butt trays in the seat

Everything was good, hard to really comfortable on a flight that long.

Unfortunately our flight was delayed by 45 minutes due to Kate arriving aircraft. Once we stated everything was great.

Good flights. Departure and arrivals were on time. DFW was a little problematic in that the Skytrain without prior notice bypassed the Echo terminal so that delayed my arrival at my connecting flight.

Because I can’t stand very long in one place, I was allowed to reword.

5 hour flight - full flight - not enough room to use my computer - slightly delayed - Admirals club was excellent quality food, drink made up for flight seating. No food offerred on flight, you ahd to prebook.

Excellent- plan was barely populated. I cannot remember a flight where I was able/encouraged to stretch out!

Great flight. Boarding was efficient and quick. On time departure and smooth flight. Flight arrived early at destination. Good experience.

Had technical issue which delayed the flight period. Flight crew knew there was 5 passengers that the connecting flight was within 15 minutes once at the gate. Rather than identify the 5 passengers to assure they got first. The flight attended mentioned it but didn't assist to assure passengers with connecting flights off first. This caused a hardship and our party of 3 missed the connecting flight.

I don't like that I have to pay if I want extra leg room. The seats are so expensive; I sit in normal seats and my legs and knees cramp the entire flight. I never feel comfortable on AA flights.

Flight was delayed at departure due to weather and the need for de-icing. The flight was smooth but there was a delay at arrival due to weather. We were in a hold for 20 minutes or more. The flight arrived more than 30 minutes late. Airlines have no control over the weather and I'm glad that they follow all safety procedures. Had to wait a long time for my checked luggage. Whole process was slow and the bags arrived wet due to the rain. The onboard wifi and entertainment access was spotty and the signal was dropped several times. Otherwise the crew was great and friendly. They tried to get everyone's bags stowed and seated so we could take off.

Regarding the boarding: it needs more efforts to make it more convenient

Deicing in Denver took forever and I almost missed my connection. De-ice faster! Not Americans fault.

They charged me 212.00 for a heavy check in bag at the gate. The pricing and process was so confusing - as if it was designed to purposefully gouge customers who need to board plane. That experience combined with the outrageous price charged will prevent me from ever flying Spirit again. And I’ll be sure to tell the story to anyone who cares to hear.

The text told me it was changed to Terminal E and Gate D5. But with no one on site to ask questions there was confusion on where to go as all the gates were E's. Then we took the skyline to the D area. We left to get something to eat. No announcement was made but my daughter happened to asked and they told her our gate was moved to D12. I will not fly Spirit again.

The agent at the check in desk was absolutely rude. The rest of the team after that was good, but the check in process at LAS was miserable. The woman at the desk spoke like we were stupid and was rude throughout the process.

Its so random that they only allow 40 pounds on checked bags when all airlines take 55. They then charge you for each 10 extra pounds, so my checked suitcase was $130 and the flight $30 ... its like whattt, im for sure not traveling with Spirit again

The flight attendants were very personable, extremely friendly, and had a very good feeling of the energy around them not to mention they’re very funny and engaging. What made up for the discomfort of the seats and the fact that the plane sat for a long time on the Turmac. Not sure if the pilot was new, but the landing was very rough sort of like I was at a magic mountain theme park ride that was built in 1959

Flight was delayed 2+ hours missed a concert because of it…

So bad. The check in process was laborious and the check in agent didn't seem to know how to manage the process efficiently and was confused about how to check in my son's sports equipment. The baggage fees were outrageous and so expensive. $90 for a carry on bag? And $200 additional for 2 check ins. The security lines were insanely long and the terminal was not very nice in the Spirit area. $5 for a water on board. It was my first and last time flying Spirit - I tried to save $ by flying them due to the accommodating schedule but I should have paid for Southwest, because it would've actually ended up less expensive due to the free bags with Southwest. There were no charging ports on the airplane, no wifi and really uncomfortable seating. The flight crew were great though, courteous and efficient in their boarding. Flight was delayed 1 hour, but we made up 15 minutes in flight.

My experience was better than expected. What I did find not so great was the seats. Very little room, they did not recline and the tray table was the size of a post card. There was no food to try, just standard snacks that you had to pay for and I don’t know of any entertainment. I would fly again even though everything was an upcharge. Flight was on time with little disturbance

thy don't even ofer water we have to buy it for $4.49 and paid for our cary on bags $100 each we never will fly in this company again.

Super cool and laid back, three lovely ladies. Couldn’t ask for better service.

Flight was OK. Seats were good no cell phone charges on the plane no TVs or entertainment.

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

The truck that was refueling the plane drove away with the hose still connected to the plane and ripped part of the plane off with it

The boarding time. I was in Section 1 the lady in charge just let people in section 3 without see us. Make a line , I have to step out and ask her. We were in the line and she just take my ticket and that’s it, so if I don’t ask her she could leave us at the end! We paid more for that privilege and. She doesn’t care….

Was just ok with over selling I guess. A lot of people in a short space and when we finally arrive i20 minutes, waiting to get out from the plain because we were waiting authorization for out boarding? Something like that.

See my previous comment which is mostly about our flight from Phoenix to SFO

They changed my flight and did not want to accommodate me or try to help me in any way. They do not care about their customers.

The check in at the airport was awful. Told I need to pay for a bag. The item was taken at screening. I went back to get my $ back and they gave me a coupon with a QR code that doesn’t work. Worst costumer service ever!!!!!

4 hour delay because they used our aircraft to fly a different segment (per the captain)

Book cheap flights from Chicago to Ontario

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Chicago to Ontario found on KAYAK in the last 72 hours.
5/22Wed
1 stopFrontier
10h 33mMDW-ONT
$51
5/16Thu
1 stopFrontier
27h 37mMDW-ONT
$53
5/1Wed
1 stop
8h 18mORD-ONT
$75
5/1Wed
1 stop
8h 18mORD-ONT
$91
5/28Tue
1 stopDelta
6h 13mORD-ONT
$110
5/28Tue
1 stopDelta
6h 13mORD-ONT
$118
5/7Tue
1 stopUnited Airlines
8h 17mORD-ONT
$237
5/5Sun
2 stopsAmerican Airlines
8h 50mORD-ONT
$384
6/30Sun
2 stopsUnited Airlines
25h 08mORD-ONT
$385
5/26Sun
1 stopAmerican Airlines
6h 22mORD-ONT
$411

Search by stops

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Last minute flights from Chicago to Ontario

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Chicago to Ontario that are departing in the next 10 days.
4/24Wed
multi-stopFrontier
10h 09mMDW-ONT
5/8Wed
multi-stopFrontier
10h 47mONT-MDW
$168
4/24Wed
multi-stopFrontier
9h 36mMDW-ONT
4/30Tue
multi-stopFrontier
8h 39mONT-MDW
$182
4/25Thu
multi-stopAmerican Airlines
9h 22mORD-ONT
4/28Sun
multi-stopAmerican Airlines
9h 55mONT-ORD
$309
4/24Wed
multi-stopDelta
6h 09mORD-ONT
4/29Mon
multi-stopDelta
5h 40mONT-ORD
$312
4/25Thu
multi-stopDelta
9h 02mORD-ONT
4/29Mon
multi-stopDelta
11h 25mONT-ORD
$317
4/25Thu
multi-stopUnited Airlines
7h 30mORD-ONT
4/28Sun
multi-stopUnited Airlines
8h 40mONT-ORD
$388
4/25Thu
multi-stopUnited Airlines
6h 35mORD-ONT
4/29Mon
multi-stopUnited Airlines
5h 36mONT-ORD
$402
4/27Sat
multi-stopAlaska Airlines
10h 22mORD-ONT
5/5Sun
multi-stopAlaska Airlines
20h 45mONT-ORD
$467
4/25Thu
multi-stopAlaska Airlines
10h 05mORD-ONT
4/25Thu
multi-stopAlaska Airlines
8h 25mONT-ORD
$522
4/24Wed
multi-stopAmerican Airlines
6h 43mORD-ONT
4/24Wed
multi-stopAmerican Airlines
6h 15mONT-ORD
$1,592

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Flights to Ontario

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Chicago

Cabin classes: