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ORD - ONT

$70 Find cheap flights from Chicago O'Hare Airport 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 O'Hare Intl to Ontario departing on 8/27. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Sat 6/29
Sat 7/6

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 42,686,544 times on KAYAK, and here is why:

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

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from O'Hare Intl 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
8:00 am - 11:39 pmORD-ONT
17h 39m1 stop
5:30 pm - 4:47 amONT-ORD
9h 17m1 stop
$137Frontier
Find Deal
Tue, Sep 3 - Tue, Sep 10
8:00 am - 11:39 pmORD-ONT
17h 39m1 stop
5:30 pm - 4:47 amONT-ORD
9h 17m1 stop
$139Frontier
Find Deal
Thu, Aug 22 - Tue, Aug 27
9:43 pm - 7:27 amORD-ONT
11h 44m1 stop
6:48 pm - 5:42 amONT-ORD
8h 54m1 stop
$140Frontier
Find Deal
Mon, Jun 10 - Thu, Jun 13
6:00 am - 11:59 pmORD-ONT
19h 59m1 stop
12:44 am - 9:06 pmONT-ORD
18h 22m1 stop
$142Frontier
Find Deal
Tue, Jun 11 - Fri, Jun 14
6:48 pm - 12:32 pmORD-ONT
19h 44m1 stop
12:49 am - 1:03 amONT-ORD
22h 14m1 stop
$143Frontier
Find Deal
Mon, Aug 19 - Tue, Aug 20
8:23 pm - 12:54 pmORD-ONT
18h 31m1 stop
12:49 am - 12:40 amONT-ORD
21h 51m1 stop
$144Frontier
Find Deal
Mon, Jun 10 - Wed, Jun 12
7:30 pm - 7:08 amORD-ONT
13h 38m1 stop
12:30 pm - 4:47 amONT-ORD
14h 17m1 stop
$146Frontier
Find Deal
Wed, Aug 14 - Wed, Aug 21
7:30 pm - 9:06 amORD-ONT
15h 36m1 stop
5:30 pm - 4:47 amONT-ORD
9h 17m1 stop
$148Frontier
Find Deal
Wed, Aug 14 - Tue, Aug 20
12:00 pm - 7:44 pmORD-ONT
9h 44m1 stop
11:49 am - 11:56 pmONT-ORD
10h 07m1 stop
$287Delta
Find Deal
Thu, Jul 4 - Wed, Jul 10
6:05 am - 12:45 pmORD-ONT
8h 40m1 stop
1:30 pm - 11:59 pmONT-ORD
8h 29m1 stop
$298United Airlines
Find Deal
Wed, Jun 26 - Wed, Jul 3

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

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

The average price of all flights from Chicago O'Hare Intl Airport to Ontario clicked on KAYAK for each day over the last 12 months.
When flying from Chicago O'Hare Airport to Ontario, you should consider leaving on a Saturday and avoid Sundays if you are looking for the best rates. For your return to Chicago O'Hare Airport, you’ll find the best rates on Tuesdays and the most expensive ones on Sundays.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to Ontario is May, where tickets cost $268 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 O'Hare Intl Airport to Ontario?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport 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 O'Hare Airport 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 O'Hare Airport to Ontario found on KAYAK was with Frontier for $70. Frontier proposed a round-trip connection from $137 and Delta from $287.

Good to know

Low season

September

High season

March

Cheapest flight

$70
Best time to beat the crowds with an average 15% drop in price.
Most popular time to fly with an average 5% increase in price.
Flight from Chicago O'Hare Airport to Ontario

When to book flights from O'Hare Intl to Ontario

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

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

    In the last 3 days, the lowest price for a flight from Chicago O'Hare Intl Airport to Ontario was $70 for a one-way ticket and $137 for a round-trip.

  • Do I need a passport to fly between Chicago O'Hare Airport 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 aircraft models fly most regularly from Chicago O'Hare Airport to Ontario?

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

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

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

  • 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 $355 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 $489 and an overall rating of 7.4.

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Chicago O'Hare Airport 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 O'Hare Airport 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 O'Hare Airport with another airline. Booking your flights between Chicago O'Hare Airport and ONT 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 Chicago O'Hare Airport 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 O'Hare Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top 5 airlines serving from O'Hare Intl 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 O'Hare Intl 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 10457 reviews
7.4Food
8.0Entertainment
8.2Boarding
7.9Comfort
8.6Crew
Airline reviews

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.

8.0 ExcellentLiam, May 2024SLC - SJC
Read more about Delta reviews

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.

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

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.

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.

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.

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

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.

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

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

I am very disappointed with Frontier Airlines. They cancelled our flight because they couldn't find a crew member, and then didn't get us to our connecting flight. We had to cancel our whole vacation. We were promised flight and hotel vouchers, but they never sent them.

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

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!!!!!

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.
8/27Tue
1 stopFrontier
6h 32mORD-ONT
$70
6/6Thu
1 stopFrontier
6h 59mORD-ONT
$74
7/20Sat
1 stopAmerican Airlines
5h 24mORD-ONT
$99
6/15Sat
1 stopAmerican Airlines
5h 42mORD-ONT
$100
6/11Tue
2 stopsDelta
11h 35mORD-ONT
$123
6/4Tue
1 stopDelta
6h 13mORD-ONT
$161
7/11Thu
1 stopUnited Airlines
8h 10mORD-ONT
$163
8/31Sat
2 stopsAlaska Airlines
10h 02mORD-ONT
$177
8/13Tue
2 stopsAlaska Airlines
19h 24mORD-ONT
$178
7/8Mon
1 stopUnited Airlines
17h 25mORD-ONT
$241

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Last minute flights from O'Hare Intl 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.
6/1Sat
multi-stopFrontier
6h 22mORD-ONT
6/14Fri
multi-stopFrontier
18h 22mONT-ORD
$198
6/4Tue
multi-stopFrontier
15h 30mORD-ONT
6/12Wed
multi-stopFrontier
10h 45mONT-ORD
$199
6/1Sat
multi-stopAmerican Airlines
8h 47mORD-ONT
6/15Sat
multi-stopAmerican Airlines
7h 58mONT-ORD
$259
5/31Fri
multi-stopAmerican Airlines
8h 21mORD-ONT
6/3Mon
multi-stopAmerican Airlines
9h 57mONT-ORD
$321
5/31Fri
multi-stopDelta
6h 13mORD-ONT
6/2Sun
multi-stopDelta
8h 19mONT-ORD
$322
5/31Fri
multi-stopDelta
13h 21mORD-ONT
6/2Sun
multi-stopDelta
8h 19mONT-ORD
$327
6/1Sat
multi-stopUnited Airlines
7h 33mORD-ONT
6/5Wed
multi-stopUnited Airlines
8h 30mONT-ORD
$756
5/31Fri
multi-stopAlaska Airlines
10h 08mORD-ONT
6/2Sun
multi-stopAlaska Airlines
10h 49mONT-ORD
$854
5/31Fri
multi-stopAlaska Airlines
9h 01mORD-ONT
6/2Sun
multi-stopAlaska Airlines
10h 19mONT-ORD
$886
6/2Sun
multi-stopUnited Airlines
7h 33mORD-ONT
6/6Thu
multi-stopUnited Airlines
8h 30mONT-ORD
$901

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Chicago O'Hare Airport - Ontario Flights

Departure:

Chicago O'Hare Airport (ORD)United States

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Chicago O'Hare Airport

Cabin classes: