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ONT - CHI

$60 Find cheap flights from Ontario to Chicago

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Chicago 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 6/6
Thu 6/13

Search hundreds of travel sites at once for deals on flights to Chicago

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Chicago, 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 Ontario to Chicago, as well as popular online travel agencies
In the last 7 days travelers have searched 42,573,820 times on KAYAK, and here is why:

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Cheap flight deals from Ontario to Chicago (ONT-CHI)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Chicago 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
2:25 pm - 11:09 amONT-MDW
18h 44m1 stop
8:50 pm - 7:03 amMDW-ONT
12h 13m1 stop
$127Frontier
Find Deal
Tue, May 21 - Sat, Jun 8
10:10 pm - 5:50 amONT-MDW
5h 40m1 stop
9:10 pm - 12:54 pmMDW-ONT
17h 44m1 stop
$128Frontier
Find Deal
Sat, May 18 - Mon, May 20
12:59 am - 1:49 pmONT-MDW
10h 50m1 stop
9:05 pm - 7:29 amMDW-ONT
12h 24m1 stop
$129Frontier
Find Deal
Mon, May 20 - Sat, May 25
2:25 pm - 11:09 amONT-MDW
18h 44m1 stop
9:05 pm - 9:32 amMDW-ONT
14h 27m1 stop
$132Frontier
Find Deal
Tue, May 21 - Sat, May 25
12:59 am - 9:15 pmONT-ORD
18h 16m1 stop
7:59 pm - 7:29 amORD-ONT
13h 30m1 stop
$132Frontier
Find Deal
Mon, May 20 - Sat, May 25
11:22 am - 12:06 amONT-ORD
10h 44m1 stop
1:25 pm - 11:00 pmORD-ONT
11h 35m2 stops
$241Delta
Find Deal
Tue, Jun 4 - Sat, Jun 8
5:41 pm - 5:00 amONT-ORD
9h 19m1 stop
8:00 am - 7:14 pmORD-ONT
13h 14m2 stops
Sat, May 25 - Wed, May 29
10:00 pm - 12:42 pmONT-ORD
12h 42m2 stops
7:45 am - 12:13 pmORD-ONT
6h 28m1 stop
$284Delta
Find Deal
Fri, May 31 - Wed, Jun 5
6:00 am - 6:29 pmONT-ORD
10h 29m1 stop
8:00 am - 11:58 pmORD-ONT
17h 58m2 stops
$288Alaska Airlines
Find Deal
Wed, Jun 5 - Wed, Jun 12
8:29 pm - 5:00 amONT-ORD
6h 31m1 stop
2:54 pm - 11:58 pmORD-ONT
11h 04m2 stops
Tue, May 21 - Thu, May 30

Flights from Ontario to Chicago - Travel Insights & Trends

Get data-powered insights and trends into flights from Ontario to Chicago 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 Ontario to Chicago?

The average price of all flights from Ontario to Chicago clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from Ontario to Chicago, look for departures on Wednesdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Chicago, Thursday is the cheapest day to fly and Sunday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ontario to Chicago, 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 Ontario to Chicago is January, where tickets cost $238 on average. On the other hand, the most expensive months are March and June, where the average cost of tickets is $378 and $371 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to Chicago, 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 Ontario to Chicago, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 86 days before departure.

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

Each day, there are between 1 and 3 nonstop flights that take off from Ontario and land in Chicago, with an average flight time of 3h 51m. The most common departure time is 6:00 am and most flights take off in the morning, while the most flights land at Chicago Midway Airport. Each week, there are 13 flights. The most frequent day of departure is Tuesday, when 23% of all weekly flights depart. The fewest flights depart on a Sunday.

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

Early birds can take the earliest flight from Ontario at 5:00 am and will be landing in Chicago at 10:50 am.

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

If you prefer to fly at night, the latest flight from Ontario to Chicago jets off at 9:55 am and lands at 3:40 pm.

Good to know

Low season

February

High season

November

Cheapest flight

$60
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly and prices are also 19% lower on average.
Flight from Ontario to Chicago O'Hare Airport

When to book flights from Ontario to Chicago

Are your dates flexible? Find out the best times to travel from Ontario to Chicago 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 Ontario to Chicago

  • Which is the best arrival airport if I want to visit the Museum of Science and Industry?

    ORD offers the best linkage to The Museum of Science and Industry, which lies approximately 24.2 miles away. Bus line 6 provides the most convenient connection to this attraction, covering the journey in about 1h 18min. For a quicker connection, take a taxi and get there in under 30min.

  • Is there a prayer room at Chicago Midway International Airport (MDW)?

    Religious souls landing at MDW from ONT and want to thank the Almighty for the safe trip will find a sacred suite where they can retreat quietly and respectfully. You can locate this sanctuary in Concourse C on the mezzanine level, and it’s open 24/7.

  • Are there car rentals from O'Hare International Airport (ORD) to downtown Chicago?

    There’s a wide range of car rental services at ORD, ideal for anyone keen to explore Chicago in a car. Once you land at the airport, locate your car dealer’s desk in the arrival hall. A free shuttle will drop you at the pick-up point at Routes Car & Truck Rentals at 3901 Mannheim Rd, Schiller Park.

  • Does O'Hare International Airport run an art program?

    ORD boasts an extensive exhibition of unique pieces of art and crafts throughout its terminals. Consider killing time in concourses B and C and enjoy the various sculptures, murals, and paintings.

  • What is the cheapest flight from Ontario to Chicago?

    In the last 3 days, the lowest price for a flight from Ontario to Chicago was $60 for a one-way ticket and $127 for a round-trip.

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

    No, a passport isn't needed to fly from Ontario to Chicago. However, local authorities might ask for an official ID.

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

    On your way to Chicago, you’ll fly out from Ontario. You’ll be landing in one of Chicago’s 2 airports: Chicago Midway or Chicago O'Hare Intl.

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

    We unfortunately don’t have that data for this specific route.

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

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Chicago are Delta and United Airlines. With an average price for the route of $381 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 $401 and an overall rating of 7.4.

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

    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 Ontario to Chicago.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Chicago from Ontario 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 Ontario to Chicago?

    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 Chicago with an airline and back to Ontario with another airline.

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

    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 Chicago from Ontario 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 Ontario to Chicago

  • Ontario International Airport (ONT) is a hub of multiple licensed car and shuttle operators providing services to several destinations within and beyond this establishment. Many run counters at the passenger terminals, parking lots, and car rental centers. Still, most of the nearby airport hotels offer courtesy shuttles to and from the airport.
  • Those who intend to leave ONT for Chicago early in the morning will find it helpful if they spend a night in one of the hotels near Ontario International Airport (ONT). Usually, such properties offer complimentary cars to and from the departure terminal, thus enabling you to be there in time for your voyage. La Quinta Inn & Suites by Wyndham Ontario Airport guarantees that stay.
  • If you’re departing from Ontario International Airport (ONT) to Chicago, remember that the establishment has three terminals. If you're using United Airlines, you’ll leave via Terminal 2, while Terminal 4 serves Southwest Airlines. Movement from one terminal to the other is via an Inter-Terminal Shuttle, which runs every 5-10min on the landside.
  • Those flying aboard American Airlines from ONT to Chicago should know that the carrier runs its hub at Chicago O'Hare International Airport (ORD). Passengers arrive at ORD via Terminal 3 and can retreat to the Admirals Club in the same terminal, Airside. Members and registered cardholders enjoy priority access and clearance under the fast lane program. Still, Economy Class travelers can enjoy the suite after paying for the day’s pass.
  • Southwest Airlines allows passengers from Ontario International Airport (ONT) to Chicago to bring their furry friends into the cabin. Usually, these four-legged friends are household animals such as cats, dogs, and birds. The pets must bear their valid medical certificates and remember to lock them in their kernels throughout the trip.
See more tips

Prefer to fly non-stop from Ontario to Chicago?

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

Nonstop departures

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

Nonstop returns

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
See more direct flights

Top 5 airlines serving from Ontario to Chicago

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Chicago. 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 Ontario to Chicago? 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 10818 reviews
8.0Entertainment
7.4Food
8.6Crew
7.9Comfort
8.2Boarding
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.

I usually have a positive experience with Delta. Complimentary upgrades are always nice!

I didn’t not like that I could not select my seat and ended up with the worse seat.

The landing was bad and the hostess came two times and i was sleeping but when she served the person that nexts to me I woke up and she didn’t even asked me if I need any drink or snacks two times!!!!

Plane was late because of a mechanical malfunction and the food listed as available was not. Flight attendants seem over worked and under paid. They just done seem happy. And that can be seen in their faces.

Waited 3 hours on a plane to de-ice due to manpower issues. Waited another hour and a half once we landed because of a gate issue. Missed my connections. Created. A total of 13 hours of delay.

Great, on time departure, friendly and accommodating crew, great leg room, Smith flight

Plane was turned around due to fog half way into the flight, Delta did not properly direct passengers to stay on same flight and instead failed to properly rebook on Alaska

Like most domestic flights in the US, you are basically on your own with this airline when it comes to food, so be sure to purchase meals and drinks ahead of time or expect to arrive starving and dehydrated (like I was).

You need to be a hacker to get the (Free) WiFi

I was told we'd have a hot breakfast option in first class, so I chose not get a hot breakfast. It was a very strange meal, but the fresh fruit was very good quality. Service was excellent from ORD to ELP. No service from MBS to ORD, not even water. However, when flying American from FNT to ORD, which is a shorter flight, they at least pass out snacks and offer water.

The delays (5 hrs) were a comedy of errors, and the multiple safety issues encountered were very concerning.

The flight was delayed instead of leaving at 11 it left at 12.20

United WiFi is consistently unusable (it can take 10 mins to load a single web page). If you need Wifi to do work, be prepared to lose half a day of productivity.

Good movies, iffy pay WiFi, food ok- on time though and that was great!

Awful…flight was delayed more than 12hrs, missed all connections to Fort Wayne, IN, had to get flight to another city 2 hours from my destination, flight was again delayed by 40 mins because they did not have enough fuel, again missed a connection, finally arrived in Indiana at 11pm…but before my 2 hour drive home, ay, no Five That Our Luggage Never Made On The plane and Still In Chicago

Boarding was friendly and quick. While the plane model was older with no live tv, the entertainment was full of movies and tv shows. All food was available. Pilots were very communicative with status of the flight. Flight landed on time.

The Palm Springs to Chicago O’Hare was on Time and Palm Springs airport is easier navigate. As our connection was only an approximately 50 minutes, we asked staff for insights for the Chicago airport in terms of transferring into the other terminal from which our flight left, and they were unhelpful. However, the United App was very helpful in terms of notifications and even providing directions. The Chicago to Detroit flight was significantly delayed which we all know does happen. However, there were very few updates or notifications as to why this was happening when we would actually arrive. It took nearly 30 minutes for bags to make it to baggage claim. We arrived nearly 1 hour late on a 40 minute flight.

Flight cancelled due to fog. No other flights available for 36 hours. Directed by United to book passage on another carrier, and submit receipts for reimbursement. Did that. United now states they will not reimburse. Currently out 2 grand.

The flight was delayed by 4 hours !!!!! It was very uncomfortable , and they told us only one our before departure

The CX617 from HK to BKK was delayed more than 1.5 hours.

This flight is frequently delayed. The connections seemingly are more frequently delayed. I’ve missed connections as a result twice on the same route to charlotte then Charleston. Final destination arrival has been the next day, twice in a row. No pilots, no crew. Too many excuses. Unfortunately, my days with American are over.

Entertainment was okay not because anything was wrong but it is a short flight so having no wifi is annoying but understandable. Crew was outstanding as usual

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

Flight was fine. It took an unusually long time to have baggage delivered to the carousel in ORD.

Average - flew with Jet Blue internal and it was far more comfortable and better food and entertainment. Notable difference

The flight got canceled due to mechanical issues, and he to be rebooked and missed my appointments for that day

The flight was scheduled to depart DCA at 12:30 pm but was delayed twice on the ground so that we were finally scheduled to depart at around 4:00 pm. Once we boarded, it was announced that takeoff would be delayed again to fix a hydraulic problem which delayed our eventual takeoff until around 5:00 pm. Once we departed, it was a smooth flight back to ORD. We did not get any explanation about what caused the original significant delay. In my experience, this happens frequently with AA.

The only problem experienced was a ground stop in Chicago due to weather. But the crew handled everything professionally. They prioritized rebooking those passengers who had connecting flights and then deplaning the other passengers. When the hold was lifted, they efficiently re-boarded all the passengers so that we could depart before our departure limit expired.

Our second leg to Jackson WY was unable to land due to weather. We were flown back to Dallas after stopping in SLC. We were given hotel rooms and vouchers. We were told that we would be back on the same plane in the morning. Instead we were given a different flight with different seats. Not a good experience. No one knew what was going on.

Crew was nice, explained emergency protocol very well. Flight took off and arrived on time. Pilot explained the small delay that occurred with docking and providing updates. I would definitely fly spirit again.

The seat are terrible. Don’t even think of sleeping on a Spirit flight. The kids that run the plane aka flight attendants are pretty rude and straight forward. They get the job done but without class.

I had a death in my family and booked my flight on Spirit. My flight was cancelled the morning of my flight, no explanation, no help to rebook, nobody to talk to. The next available flight was 2days later !!!! Terrible airline, will NEVER fly with them again!

They took a horrible route with a lot of turbulence and I eneded up getting sick. Even if the flight takes longer. Don't put people life at risk just to get to the airport on time.

Every thing was fine ,low price,easy on time ,clean, good staff, really no issues

Had to board plan 2x due to lack of security check after 1st boarding

Miserable. The crew was rude, the flight was delayed 5 hours for mechanical reasons and then “weather” even though other planes were leaving.

They kept Changing the flight times. It was delayed several times and at one point it was supposed to depart at 3.40am! At which point we ended up staying overnight and booked long a separate United flight for early morning departure. The spirit flight then got moved up and left at 1.30 in the morning when it was supposed to leave at 9.40pm the night before.

Flight was delayed...not horribly late. Just before push back engine shut down for a quick replacement item that took about five minutes. After that, everything was smooth and the pilot was able to make up time in the air so that our arrival time was not too far off the original anticipated arrival time.

Only inflight purchases for food and water. Nothing comes with ticket price. Have to purchase bags, food...

Our flight was delayed an hour, then when we got to board our flight finally, we were waiting in our seats for take off for 45 minutes before it was communicated that there was a maintenance issue therefore we waited on the plane for over an hour while that was resolved. We did not get to Phoenix until almost 3 hours after we were originally supposed to. This was the first and last time I will be flying Frontier.

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 process of buying the ticket and navigating all the hidden charges that Frontier throws at you was a terrible experience. The actual airport experience and flying was fine.

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

Terrible. Seats are bad and the baggage policy is inconsistent

Better than I expected but I did pay for a seat and carry on bags ahead of time.

I hope to avoid flying with them in the future. First flight got cancelled then got stuck with a 13 hour layover in Denver. The process was long and frustrating to many people.

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

The flight was delayed and I had to cancel because I would have missed my connection and there were no other flights for the next two days. They also lost my bag!!

Book cheap flights from Ontario to Chicago

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ontario to Chicago found on KAYAK in the last 72 hours.
5/22Wed
1 stopFrontier
8h 38mONT-ORD
$60
5/13Mon
1 stopFrontier
10h 37mONT-MDW
$61
5/13Mon
1 stop
9h 49mONT-ORD
$83
6/1Sat
1 stopDelta
8h 46mONT-ORD
$118
5/29Wed
2 stopsDelta
12h 55mONT-ORD
$123
5/19Sun
1 stop
10h 31mONT-ORD
$125
5/26Sun
1 stopAmerican Airlines
9h 22mONT-ORD
$133
6/21Fri
1 stopAmerican Airlines
7h 58mONT-ORD
$182
7/6Sat
1 stopUnited Airlines
8h 29mONT-ORD
$206
5/17Fri
1 stopUnited Airlines
7h 25mONT-ORD
$207

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Last minute flights from Ontario to Chicago

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 Ontario to Chicago that are departing in the next 10 days.
5/11Sat
multi-stopFrontier
21h 57mONT-ORD
5/20Mon
multi-stopFrontier
18h 55mORD-ONT
$146
5/11Sat
multi-stopFrontier
21h 57mONT-ORD
5/21Tue
multi-stopFrontier
15h 05mORD-ONT
$147
5/10Fri
multi-stop
8h 25mONT-ORD
5/13Mon
multi-stop
7h 32mORD-ONT
$251
5/7Tue
multi-stopAmerican Airlines
8h 27mONT-ORD
5/10Fri
multi-stopAmerican Airlines
8h 44mORD-ONT
$319
5/8Wed
multi-stopAmerican Airlines
6h 36mONT-ORD
5/10Fri
multi-stopAmerican Airlines
8h 44mORD-ONT
$320
5/10Fri
multi-stopDelta
7h 52mONT-ORD
5/12Sun
multi-stopDelta
6h 13mORD-ONT
$322
5/9Thu
multi-stopDelta
12h 05mONT-MDW
5/14Tue
multi-stopDelta
9h 24mMDW-ONT
$327
5/8Wed
multi-stop
8h 41mONT-ORD
5/10Fri
multi-stop
10h 48mORD-ONT
$355
5/8Wed
multi-stopUnited Airlines
7h 25mONT-ORD
5/10Fri
multi-stopUnited Airlines
8h 44mORD-ONT
$412
5/7Tue
multi-stopUnited Airlines
6h 00mONT-ORD
5/7Tue
multi-stopUnited Airlines
8h 44mORD-ONT
$702

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Ontario - Chicago Flights

Departure:

Ontario (ONT)United States

Return flight deals:

Chicago - Ontario

Cabin classes:

$404