Find flights
Deals
Insights
When to book
FAQs & Tips
Airlines

ONT - ORD

Find cheap flights from Ontario to Chicago O'Hare Airport from $59

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 O'Hare Intl 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
Tue 6/4
Tue 6/11

Search hundreds of travel sites at once for deals on flights to Chicago O'Hare Airport

 
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 43,369,418 times on KAYAK, and here is why:

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from Ontario to O'Hare Intl (ONT-ORD)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to O'Hare Intl 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
5:41 pm - 5:00 amONT-ORD
9h 19m1 stop
7:59 pm - 9:32 amORD-ONT
15h 33m1 stop
$127Frontier
Find Deal
Sat, May 18 - Sat, May 25
5:41 pm - 5:00 amONT-ORD
9h 19m1 stop
7:59 pm - 9:04 amORD-ONT
15h 05m1 stop
$128Frontier
Find Deal
Sat, May 18 - Tue, May 21
5:41 pm - 5:00 amONT-ORD
9h 19m1 stop
8:23 pm - 7:03 amORD-ONT
12h 40m1 stop
$138Frontier
Find Deal
Tue, Jun 4 - Wed, Jun 12
8:29 pm - 5:00 amONT-ORD
6h 31m1 stop
7:59 pm - 7:34 amORD-ONT
13h 35m1 stop
$139Frontier
Find Deal
Tue, May 28 - Sat, Jun 1
8:29 pm - 5:00 amONT-ORD
6h 31m1 stop
7:59 pm - 7:24 amORD-ONT
13h 25m1 stop
$140Frontier
Find Deal
Tue, May 28 - Wed, May 29
1:20 pm - 9:58 pmONT-ORD
6h 38m1 stop
5:15 pm - 9:39 pmORD-ONT
6h 24m1 stop
$279Delta
Find Deal
Sat, May 18 - Sat, May 25
10:00 pm - 8:04 amONT-ORD
8h 04m1 stop
1:25 pm - 11:00 pmORD-ONT
11h 35m2 stops
$284Delta
Find Deal
Tue, Jun 11 - Mon, Jun 17
10:39 am - 8:45 pmONT-ORD
8h 06m1 stop
9:35 am - 6:48 pmORD-ONT
11h 13m1 stop
$309American Airlines
Find Deal
Fri, May 24 - Sun, May 26
8:35 pm - 4:47 amONT-ORD
6h 12m1 stop
6:20 pm - 9:05 amORD-ONT
16h 45m2 stops
Wed, Aug 7 - Sat, Aug 17
8:50 pm - 5:25 amONT-ORD
6h 35m1 stop
8:00 am - 11:59 pmORD-ONT
17h 59m2 stops
Fri, Jun 7 - Thu, Jun 13

Flights from Ontario to O'Hare Intl - Travel Insights & Trends

Get data-powered insights and trends into flights from Ontario to O'Hare Intl 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 O'Hare Airport?

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

What is the cheapest month to fly from Ontario to Chicago O'Hare Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ontario to Chicago O'Hare Intl Airport, 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 O'Hare Intl Airport is January, where tickets cost $215 on average. On the other hand, the most expensive months are June and July, where the average cost of tickets is $411 and $400 respectively.

How far in advance should I book a flight from Ontario to Chicago O'Hare Intl Airport?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to Chicago O'Hare Intl Airport, 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 O'Hare Intl Airport, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 87 days before departure.

Which airlines provide the cheapest flights from Ontario to Chicago O'Hare Airport?

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 Ontario to Chicago O'Hare Airport found on KAYAK was with Frontier for $59. Frontier proposed a round-trip connection from $127 and Delta from $279.

Good to know

Low season

February

High season

May

Cheapest flight

$59
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly and prices are also 21% lower on average.
Flight from Ontario to Chicago O'Hare Airport

When to book flights from Ontario to O'Hare Intl

Are your dates flexible? Find out the best times to travel from Ontario to O'Hare Intl 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 Ontario to Chicago O'Hare Airport flights

  • How can I get Downtown from Chicago O'Hare International Airport (ORD)?

    The means of transport you choose will determine how fast you will get downtown and how much you will likely spend. If you are on a budget, take CTA public bus or the suburban public bus as a public means of transport. Consider a taxi as a mode of transfer if you are getting late for your appointment. Shared Ride Shuttle, Trains, Airport shuttles, and Car rentals are also available.

  • How early should I get to ONT Airport?

    ONT is the busiest airport in the region, thus experiencing long security lines and insane traffic. To navigate through the lines, ensure you get to the airport 2-3h before your scheduled departure time.

  • Are there onsite hotels in ORD?

    If you are looking forward to sleeping at the airport, there is one onsite hotel with a free airport shuttle connected to all Terminals via an underground walkway. The Hilton Chicago O' Hare Airport Hotel is located in Terminal 2. However, suppose you miss a room at this hotel. In that case, nearby hotels offer free bus shuttles, like Aloft Chicago O'Hare and The Crowne Plaza Chicago O'Hare Hotel and Conference Center.

  • Can I book a flight with layover options?

    If you love airline layover options, consider flying with Spirit Airlines and Frontier Airlines. Both tend to have their layover option at Las Vegas Harry Reid International Airport (LAS).

  • What is the cheapest flight from Ontario to Chicago O'Hare Intl Airport?

    In the last 3 days, the lowest price for a flight from Ontario to Chicago O'Hare Intl Airport was $59 for a one-way ticket and $127 for a round-trip.

  • Do I need a passport to fly between Ontario and Chicago O'Hare Airport?

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

  • Which airports will I be using when flying from Ontario to Chicago O'Hare Airport?

    When flying out of Ontario you will be using Ontario. You will be landing at Chicago O'Hare Airport, also known as Chicago O'Hare Intl.

  • Which aircraft models fly most regularly from Ontario to Chicago O'Hare Airport?

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

  • Which airline alliances offer flights from Ontario to Chicago O'Hare Airport?

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

  • What is the most popular layover when flying to Chicago O'Hare Airport from Ontario?

    Phoenix is the most popular layover city among KAYAK users traveling from Ontario to Chicago O'Hare Airport.

  • 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 $364 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 $461 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Ontario to Chicago O'Hare Airport?

    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 O'Hare Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Chicago O'Hare Airport 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 O'Hare Airport?

    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 O'Hare Airport with an airline and back to Ontario with another airline. Booking your flights between Ontario and ORD can sometimes prove cheaper using this method.

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

    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 O'Hare Airport 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 ONT to Chicago O'Hare Airport

  • If you have an early flight from Ontario International Airport (ONT) and sleeping in the airport sounds like a nightmare, there are nearby hotels where you can spend your night. The Candlewood Suites Ontario Convention Center, Comfort Suites Ontario Convention Center, and Azure Hotel & Suites Ontario Airport are nearby hotels. It is worth mentioning that Comfort Suites Ontario Convention Center; is the only hotel that offers free shuttle services to the airport terminals.
  • Regardless of what class service you are flying, there are onsite lounges that you can access by either purchasing a day pass or paying at the door at Ontario International Airport (ONT). Aspire Lounge is located in Terminal 2 and Terminal 4.
  • Ontario International Airport has nursing facilities for mothers traveling with their toddlers. There are two baby rooms for breastfeeding and diaper changing. One changing room is located in Terminal 2 and another in Terminal 4. These rooms have a sink, comfortable seats, a changing table, power output, and a private breastfeeding unit. In Chicago O'Hare International Airport (ORD), the mother's rooms are located in Terminal 1 and Terminal 2. You can find lactation rooms in Terminals 1 and 2.
  • If you have questions or need assistance at Chicago O'Hare International Airport (ORD), you need not worry. There are four information desks to assist. One is in Terminal 2 near gates B7 and C18, Terminal 2 near gate F1D, Terminal 3 at gate K2, and Terminal 5 on the Upper Ticketing Level and lower Arrivals.
  • If you want to freshen up before your meeting, there are shower facilities at Chicago O'Hare International Airport. You can use either shower at Admirals Club in Terminal 3 near Concourse H, Hilton Athletic Club, or at United Polaris Lounge in Terminal 1 near Concourse C.
See more tips

Top 5 airlines serving from Ontario to O'Hare Intl

 
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 O'Hare Intl? 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 10826 reviews
8.0Entertainment
8.2Boarding
7.9Comfort
8.6Crew
7.4Food
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

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.

Turn on the heat. Flight was way too cold from Arizona to Chicago.

Overall it was a miserable experience... I will never fly spirit for more than a 3 hour flight or overnight.

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
$59
5/18Sat
1 stopFrontier
9h 19mONT-ORD
$65
5/17Fri
1 stop
13h 21mONT-ORD
$83
5/25Sat
2 stopsDelta
12h 17mONT-ORD
$123
5/13Mon
2 stops
14h 59mONT-ORD
$126
7/4Thu
1 stopAmerican Airlines
10h 53mONT-ORD
$133
7/3Wed
1 stopDelta
8h 52mONT-ORD
$147
7/9Tue
2 stopsUnited Airlines
8h 12mONT-ORD
$211
8/7Wed
2 stopsUnited Airlines
8h 14mONT-ORD
$259
6/17Mon
2 stopsAmerican Airlines
9h 06mONT-ORD
$384

Search by stops

Search by airline

Search by price

Last minute flights from Ontario to O'Hare Intl

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.
5/10Fri
multi-stopFrontier
22h 01mONT-ORD
5/18Sat
multi-stopFrontier
13h 30mORD-ONT
$142
5/9Thu
multi-stopFrontier
22h 00mONT-ORD
5/17Fri
multi-stopFrontier
20h 30mORD-ONT
$157
5/10Fri
multi-stopFrontier
22h 01mONT-ORD
5/14Tue
multi-stopFrontier
9h 18mORD-ONT
$169
5/9Thu
multi-stopFrontier
22h 00mONT-ORD
5/15Wed
multi-stopFrontier
7h 32mORD-ONT
$187
5/7Tue
multi-stopDelta
6h 12mONT-ORD
5/11Sat
multi-stopDelta
6h 24mORD-ONT
$322
5/10Fri
multi-stopDelta
12h 17mONT-ORD
5/17Fri
multi-stopDelta
9h 15mORD-ONT
$327
5/9Thu
multi-stopAmerican Airlines
7h 13mONT-ORD
5/16Thu
multi-stopAmerican Airlines
8h 44mORD-ONT
$344
5/8Wed
multi-stop
8h 41mONT-ORD
6/3Mon
multi-stop
17h 58mORD-ONT
$377
5/9Thu
multi-stopAlaska Airlines
10h 23mONT-ORD
5/12Sun
multi-stopAlaska Airlines
9h 48mORD-ONT
$412
5/6Mon
multi-stopAlaska Airlines
16h 16mONT-ORD
5/9Thu
multi-stopAlaska Airlines
10h 05mORD-ONT
$713

Search by stops

Search by airline

Search by price

Ontario - Chicago O'Hare Airport Flights

Departure:

Ontario (ONT)United States

Destination:

Chicago O'Hare Airport (ORD)United States

Return flight deals:

Chicago O'Hare Airport - Ontario

Cabin classes: