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CHI - ONT

$76 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 6/22. 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 7/11
Thu 7/18

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 44,212,782 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
5:56 pm - 11:44 pmORD-ONT
7h 48m1 stop
8:35 pm - 4:47 amONT-ORD
6h 12m1 stop
$135Frontier
Find Deal
Sat, Aug 17 - Wed, Aug 28
11:32 am - 3:58 pmMDW-ONT
6h 26m1 stop
6:57 am - 3:59 pmONT-MDW
7h 02m1 stop
$135Frontier
Find Deal
Fri, Aug 16 - Wed, Aug 28
8:00 am - 12:32 pmORD-ONT
6h 32m1 stop
8:35 pm - 4:47 amONT-ORD
6h 12m1 stop
$136Frontier
Find Deal
Tue, Sep 10 - Tue, Sep 24
11:32 am - 4:50 pmMDW-ONT
7h 18m1 stop
8:35 pm - 6:33 amONT-MDW
7h 58m1 stop
$136Frontier
Find Deal
Tue, Sep 10 - Tue, Sep 24
5:56 pm - 11:44 pmORD-ONT
7h 48m1 stop
5:30 pm - 4:47 amONT-ORD
9h 17m1 stop
$137Frontier
Find Deal
Sat, Aug 17 - Sat, Aug 24
11:32 am - 3:58 pmMDW-ONT
6h 26m1 stop
12:49 am - 11:52 amONT-MDW
9h 03m1 stop
$137Frontier
Find Deal
Sat, Aug 17 - Fri, Aug 23
5:00 am - 8:50 amORD-ONT
5h 50m1 stop
9:35 am - 5:49 pmONT-ORD
6h 14m1 stop
$198American Airlines
Find Deal
Tue, Aug 6 - Fri, Aug 16
10:00 am - 7:25 pmORD-ONT
11h 25m2 stops
10:00 pm - 9:08 amONT-ORD
9h 08m2 stops
$246Delta
Find Deal
Tue, Sep 10 - Tue, Sep 24
7:00 am - 5:35 pmORD-ONT
12h 35m1 stop
11:29 am - 11:59 pmONT-ORD
10h 30m1 stop
$250Alaska Airlines
Find Deal
Sat, Nov 2 - Tue, Nov 12
5:05 am - 8:47 amORD-ONT
5h 42m1 stop
4:31 pm - 12:18 amONT-ORD
5h 47m1 stop
$260American Airlines
Find Deal
Thu, Jun 27 - Thu, Jul 4

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 Tuesday, and avoid Sundays 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 May, where tickets cost $271 on average. On the other hand, the most expensive months are July and August, where the average cost of tickets is $410 and $386 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 1 week before departure. For the absolute cheapest price, our data suggests you should book 22 days before departure.

Which airlines provide the cheapest flights from Chicago to Ontario?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the cheapest one-way ticket from Chicago to Ontario found on KAYAK was with Frontier for $76. Frontier proposed a round-trip connection from $135 and American Airlines from $198.

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

Each day, there are between 1 and 2 nonstop flights that take off from Chicago and land in Ontario, with an average flight time of 4h 05m. The most common departure time is 2:00 pm and most flights take off in the afternoon. Each week, there are 11 flights. The most frequent day of departure is Monday, when 18% of all weekly flights depart. The fewest flights depart on a Tuesday.

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 12:35 pm and will be landing in Ontario at 2:40 pm.

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 3:40 pm and lands at 5:45 pm.

Good to know

Low season

September

High season

May

Cheapest flight

$76
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly and prices are also 24% 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 $76 for a one-way ticket and $135 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 $399 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 $440 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 10277 reviews
7.9Comfort
8.0Entertainment
8.2Boarding
7.4Food
8.6Crew
Airline reviews

It was good until there was a 3 hour delay because there was not any pilots to fly the plane.

2.0 MediocreFelipe, Jun 2024DTW - SAN
Read more about Delta reviews

It was good until there was a 3 hour delay because there was not any pilots to fly the plane.

Had to change aircraft due to a faulty door. Surprisingly it only caused about an hour and a half of delay. Delta handled this situation as well as can be expected.

Your crew could maybe answer the call bell at least one of the times I pressed it. I pressed it first time with 2.5 hours left in our flight bc my partner was hungry and wanted a sandwich. We finally got the sandwich with 40 mins left in the flight.

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

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.

Flighty delayed on boarding - then group 1 had to check their carry on bags but groups 3 and beyond could carry bags on - very inconvenient for weekend business trip with no checked baggage. Then delayed on the runway - before take off. No communication from pilot on why or how long. Wifi/Entertainment didn't work for 4+ flight. Upon arrival, attendants announced wrong carousel for baggage claim - everyone was waiting at the wrong place for their checked bags. This was a mess united!

There was no screens on board AND the WiFi didn’t work. My seat was broken and couldn’t recline so I couldn’t even sleep. The flight attendants didn’t offer anything to make it more comfortable. It was such an old cramped plane, when the person in front of me reclined I couldn’t even open my tray table. All the United ads talk about guaranteeing everyone gets a screen!

I’ve had a couple flights this week on United that were delayed by an hour or more

Great! The plane was decently sized and comfortable. The staff was nice and there was great in flight entertainment

Last minute gate change nearly caused us to miss our flight. Change was not announced or displayed in the main board at the old gate. Terrible communication. When we landed we had to wait 20 minutes because there was another plane at the assigned gate. Not the crew’s fault, but adding 20 minutes to a 45 minute flight sucked.

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.

My husband and I pre-ordered our food, but they did not have my husband’s order, and my cheese plate was very average. I asked for a blanket and was told they don’t carry blankets on domestic routs. The flight was on time and smooth!

Everything was great except for the wifi was junk. Crew was super friendly and helpful

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.

Terrible leg room, seats don’t recline, delayed flight, and even water isn’t free onboard

Flight was good and clean but delayed over an hour on the return flight.

It was nice! There was a very unhappy child in front of us and the flight attendant did a great job calming the child. I was impressed.

The plane was not on time for boarding or departure or arrivals.

Flight expected to leave at 6:40 pm ended leaving at 8:00 am the following day. I slept in a cold airport. Never again Spirit for me…

This was the return leg of my journey with Spirit Airlines. Despite its reputation, I found no issues as it got me from point A to B safely and without delay, especially with no mechanical delays, which is fantastic in my book! The staff, from ground crew to cabin crew, were all pleasant and hassle-free. The flight was smooth from takeoff to landing. I have absolutely no complaints about this no-frills airline!

It was the worst ever, i will be filing a lawsuit to get a refund. Our flight was delayed 4 hours so we would miss our connecting flight, we were not rebooked to our destination the same day, we were not offered any options to get home on the same day despite being clear that we absolutely cannot get stranded at night due to family, we were forced to book our own flights on a different airline to get home, and spririt is refusing a refund because our flight wasn't cancelled, only delayed. oh yeah, and they lost our luggage on the first part of the trip and you cannot get a hold of customer service when anything goes wrong, on hold for 30+ minutes. and their app breaks so you can't use that either.

My flight was cancelled!!! I had to spend 200.00 on another flight!!

They stuck us with multiple extra fees. I will never fly spirit again

The guy with severe body odor sat next to me. For the whole duration of the flight it was a torture. The airline should have better policy on limiting people with bad body odor to board the flight. Passengers should not be the ones to endure bad odor for the whole duration of the flight. The airline should be e the one to ensure decent air quality for ever passenger.

I strongly dislike Frontier. I find them barebones, the seats not particularly comfortable, the nickel and diming is maddening, the app is TERRIBLE - super confusing to navigate, and the last 4 frontier flights I have flown have been on AVERAGE 2 hours late, one ruining a fancy night out in Vegas with reservations made well in advance, which was nodded to with a measly 5000 miles, which translates to almost nothing. At least credit a free checked bag or something.

8 hr delay. had to buy another ticket with another airline

Four and a half hour delay in total. What frustrates me most is the poor communication and disorganization.

I appreciated the upgrade to free cary-on bag and seat selection at no charge

FRONTIER SUCKS! The agent downstairs tricked me into booking, just to get to the gate. At the gate, they told me they couldn't help. I then called Customer Service. They and the gate attendants kept blaming each other. Neither side was willing to help the customer.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Flight was delay 9hrs and nothing was provided at airport, had to go and get a room to sleep in, paid for Uber back and fort with no offers until we landed back home a 1hr later for a $75 voucher for a future flight.

Didn't like anything..entire crew was very rude to everyone on the flight. Plane old and the trays fall down on you the while time you're flying. Charged more for a carry on bag than for the plane ticket itself. Did make it from point a to point b, but worth the extra money to fly with another airline

It was delayed 9 hours for operational reasons, despite the plane arriving to the airport on time.

9hrs delay and didn’t provided anything until after flight landed $75 voucher for fiuture travel no meals or anything.

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.
6/22Sat
1 stopFrontier
12h 13mMDW-ONT
$76
6/17Mon
1 stopFrontier
17h 21mORD-ONT
$79
6/19Wed
1 stopDelta
6h 22mORD-ONT
$118
6/18Tue
2 stopsDelta
11h 35mORD-ONT
$123
6/20Thu
1 stopAmerican Airlines
7h 03mORD-ONT
$144
8/11Sun
1 stopAlaska Airlines
13h 43mORD-ONT
$147
8/24Sat
2 stopsAmerican Airlines
11h 39mORD-ONT
$149
9/7Sat
2 stopsAlaska Airlines
17h 20mORD-ONT
$153
6/29Sat
1 stopUnited Airlines
6h 58mORD-ONT
$181
7/3Wed
2 stopsUnited Airlines
31h 11mORD-ONT
$257

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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.
6/14Fri
multi-stopFrontier
13h 46mMDW-ONT
6/24Mon
multi-stopFrontier
6h 43mONT-MDW
$175
6/13Thu
multi-stopFrontier
14h 41mORD-ONT
6/21Fri
multi-stopFrontier
18h 17mONT-ORD
$176
6/15Sat
multi-stopDelta
10h 28mORD-ONT
6/17Mon
multi-stopDelta
11h 02mONT-ORD
$327
6/15Sat
multi-stopDelta
11h 35mORD-ONT
6/17Mon
multi-stopDelta
11h 02mONT-ORD
$332
6/12Wed
multi-stopAmerican Airlines
5h 42mORD-ONT
6/15Sat
multi-stopAmerican Airlines
8h 10mONT-ORD
$412
6/14Fri
multi-stopAmerican Airlines
7h 42mORD-ONT
6/28Fri
multi-stopAmerican Airlines
6h 57mONT-ORD
$442
6/15Sat
multi-stopUnited Airlines
9h 57mORD-ONT
7/20Sat
multi-stopUnited Airlines
8h 14mONT-ORD
$565
6/13Thu
multi-stopUnited Airlines
6h 16mORD-ONT
7/20Sat
multi-stopUnited Airlines
8h 14mONT-ORD
$623
6/15Sat
multi-stopVolaris
22h 12mORD-ONT
6/17Mon
multi-stopVolaris
22h 07mONT-ORD
$1,194
6/14Fri
multi-stopVolaris
23h 12mORD-ONT
6/17Mon
multi-stopVolaris
22h 07mONT-ORD
$1,303

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Flights to Ontario

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Chicago

Cabin classes: