ORD - ONT

$67 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 4/19. 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
1 adult, Economy, 0 bags

KAYAK searches 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
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$133
Overall average: $425
Frontier
Fri 3/6Wed 3/11
ORD - ONT • 1 stop
Cheapest non-stop
$227
Typical prices: $317-$382
United Airlines
Sat 5/16Sat 5/23
ORD - ONT • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
At O'Hare, security lines can exceed 30 minutes.
For a budget-friendly arrival at ONT, use Omnitrans Bus.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Frontier
Cheapest • from $133 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 22% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
April
Cheapest • 25% price drop
March
Most popular
Good to know
Good to know
+1
+1
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We hope you love your trip to Ontario!
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Flight Deals

Cheap Flights 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 for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from O'Hare Intl to Ontario

Fri, Mar 6 - Wed, Mar 11
Frontier Logo
8:55 pm - 6:15 pm
ORD
-
ONT
23h 20m
1 stop
Frontier Logo
2:23 pm - 6:08 am
ONT
-
ORD
13h 45m
1 stop
$133Frontier
Tue, Apr 28 - Wed, May 6
Frontier Logo
8:58 pm - 10:44 am
ORD
-
ONT
15h 46m
1 stop
Frontier Logo
7:29 pm - 6:47 am
ONT
-
ORD
9h 18m
1 stop
$165Frontier
Tue, Mar 17 - Tue, Mar 24
Frontier Logo
4:28 pm - 11:59 pm
ORD
-
ONT
33h 31m
2 stops
Frontier Logo
2:23 pm - 6:08 am
ONT
-
ORD
13h 45m
1 stop
$171Frontier
Fri, Mar 6 - Tue, Mar 10
Multiple Airlines Logo
8:55 pm - 1:51 pm
ORD
-
ONT
18h 56m
1 stop
Multiple Airlines Logo
2:23 pm - 11:22 am
ONT
-
ORD
18h 59m
2 stops
$175Multiple Airlines
Tue, Mar 17 - Tue, Mar 24
Frontier Logo
4:28 pm - 4:15 pm
ORD
-
ONT
25h 47m
1 stop
Frontier Logo
2:23 pm - 11:40 am
ONT
-
ORD
19h 17m
1 stop
$180Frontier
Fri, Apr 17 - Thu, Apr 23
Frontier Logo
5:25 am - 4:38 pm
ORD
-
ONT
13h 13m
1 stop
Frontier Logo
11:44 am - 6:47 am
ONT
-
ORD
17h 03m
1 stop
$181Frontier
Mon, Apr 27 - Wed, May 6
Multiple Airlines Logo
8:58 pm - 10:44 am
ORD
-
ONT
15h 46m
1 stop
Multiple Airlines Logo
7:29 pm - 5:50 am
ONT
-
ORD
8h 21m
1 stop
$183Multiple Airlines
Fri, Apr 17 - Thu, Apr 23
Frontier Logo
6:09 pm - 11:55 pm
ORD
-
ONT
31h 46m
2 stops
Frontier Logo
11:44 am - 6:47 am
ONT
-
ORD
17h 03m
1 stop
$184Frontier
Tue, Mar 10 - Thu, Mar 12
Frontier Logo
8:55 pm - 9:03 pm
ORD
-
ONT
26h 08m
1 stop
Frontier Logo
2:06 pm - 6:08 am
ONT
-
ORD
14h 02m
1 stop
$189Frontier
Fri, Apr 10 - Mon, Apr 13
Frontier Logo
2:29 pm - 11:56 pm
ORD
-
ONT
11h 27m
1 stop
Frontier Logo
9:02 pm - 6:47 am
ONT
-
ORD
7h 45m
1 stop
$190Frontier
Booking Insights

KAYAK's insights & trends for O'Hare Intl to Ontario flights

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 round-trip flights from Chicago O'Hare Intl Airport to Ontario clicked on KAYAK for each day over the last 12 months.

For Chicago O'Hare Airport to Ontario, Tuesday is the cheapest day to fly on average and Monday is the most expensive. Flying from Ontario back to Chicago O'Hare Airport, the best deals are generally found on Thursday, with Sunday being the most expensive.

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 round-trip 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 April, where tickets cost $292 (return) on average. On the other hand, the most expensive months are September and December, where the average cost of round-trip tickets is $524 and $502 respectively.

Can I save money by flying with a layover from Chicago O'Hare Intl Airport to Ontario?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $425 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip 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 week.

To get a below average price on the flight from Chicago O'Hare Intl Airport to Ontario, you should book around 2 weeks before departure, which saves you about 22% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Expert advice

Expert advice for your flight from O'Hare Intl to Ontario

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on ORD

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Good to know

Low seasonJanuary
Cheapest flight$67
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly with an average 8% 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

  • How many flights are there between Chicago O'Hare Intl Airport and Ontario per day?

    There is a maximum of 1 nonstop flight a day that takes off from Chicago O'Hare Intl Airport and lands in Ontario, with an average flight time of 4h 26m. The most common departure time is 7:00 pm and most flights take off in the evening. Each week, there are 7 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 $67 for a one-way ticket and $133 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 airlines offer Wi-Fi service onboard planes from Chicago O'Hare Airport to Ontario?

    American Airlines, JetBlue, and Alaska Airlines offer inflight Wi-Fi service on the Chicago O'Hare Airport to Ontario flight route.

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

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Chicago O'Hare Airport to Ontario flight route.

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

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

  • On which days can I fly direct from Chicago O'Hare Airport to Ontario?

    There are nonstop flights from Chicago O'Hare Airport to Ontario on a daily basis.

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

    The two airlines most popular with KAYAK users for flights from Chicago to Ontario are Southwest and Delta. With an average price for the route of $518 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $302 and an overall rating of 7.9.

  • 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.

KAYAK’s top tips for finding a cheap flight from Chicago O'Hare Intl Airport to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $242 or less one-way and $511 or less round-trip.

Prefer to fly direct from Chicago O'Hare Airport to Ontario?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Chicago O'Hare Intl to Ontario.
Find which airlines fly direct from Chicago O'Hare Intl Airport to Ontario Airport, which days they fly and book direct flights.

Direct departures

Chicago O'Hare Intl to Ontario

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

Ontario to Chicago O'Hare Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Reviews of the 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
SouthwestOverall score based on 4295 reviews
7.0Food
8.1Boarding
8.0Comfort
8.6Crew
7.5Entertainment
Airline reviews

The charges were ridiculous for an hour flight and the turbulence was very scary.

2.0 MediocreDarcey, Feb 2026
SAN - SJC
Read more Southwest reviews

The charges were ridiculous for an hour flight and the turbulence was very scary.

3 hour delay. Had to change plans and was still delayed.

The staff was very friendly, professional, and courteous. The overall flight was a great experience.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Plane crashed into a bus or some other vehicle on the ground while pulling out of the gate. No injuries, but wing tip was damaged and returned to gate for “maintenance issues” and we departed 5 hours later because the plane went out of service and new plane was flown in from a nearby airport, Midway.

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Delta continues to set the benchmark for traveler-friendly service with minimal disruption and clear communication within the mainland US (coast to coast). I am consistently pleased to be a Delta customer, and this experience once again met my expectations. There was a brief delay departing from MIA due to a technical issue that required the aircraft to return to the gate. However, the situation was handled professionally and transparently. Fortunately, my planned layover allowed ample buffer time, so the adjustment caused no stress. Overall, another smooth and reassuring experience.

Awesome! On time flight, early arrival, and a complimentary upgrade!

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

This was one of the worst flights I’ve been on in years. I upgraded to comfort and had such an uncomfortable experience. The person next to me was oversized - which I understand - however, they took up their space and mine. I could only use about 50% of my seat space to not be physically touching this person the entire flight and there was no spatial awareness. I also could not use the seat outlet because their body was obstructing it. It was very inconvenient. Their body kept touching me repeatedly during the flight and I felt very uncomfortable. To pay more for an upgraded space and then not even being able to use it was highly disappointing.

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

I usually get upgraded so my experience is usually amazing. I did not get upgraded this time - which was fine - but the wifi had issues, the monitors were going in & out, & (though not Delta's fault) one of the gentlemen next to me desperately needed a shower.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Short flight, but no drink/snack service. The flights both going and coming were delayed.

Not being stranded in Chicago for her airport to 11:30 tomorrow morning the 3rd

I was fully checked in the prior night and i was unchecked and then didn’t have a seat when I boarded. Instead of an aisle seat, I was out in the middle seat of the very last row of the plane.

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

They lost my luggage, so, not happy. The crew was nice but my suitcases never made it, still trying to find out what happened!

I understand weather is an issue, but making us chase our plane down at five scheduled gates across three terminals in an airport the size of O'Hare was unfair. They'd have probably been better off to leave gates as TBD until the inbound plane is in final approach instead of running us all over the place. Also, props to the consistently-unprepared ground crew in Richmond for once again leaving my lane parked short of the gate because they couldn't have a crew in place on time with 2 hours notice...

cabin crew was OK, food was OK, the trip from the US to Munich was actually pretty bad comfort wise. Noisy aircraft, lights never dimmed even in Business class (night flight) barely sufficient amenities for the price. I have millions of miles with United but TBH American is gaining ground and Delta has always been marginally better then United although on paper United has more longes and cheaper upgrades.

Essy to get on. The hostess gave very little pop, the plane was late getting in, and we are still waiting for our bags. This sucks. :/

Great flight. On time boarding. Smooth flight and on time arrival at EWR. The flight crew was marvelous and there was a great selection of movies on the entertainment system. Our bags were at the carousel before we got there. Another excellent flight from United.

I liked the snacks and the flight attendants were friendly.

No Snacks or Entertainment. The flight was short, snacks should still be given.

See prior comment about how Kayak mishandled my reservation and delayed my arrival by 6 hours.

Boarding delayed 20 minutes for no reason, no wifi, in flight entertainment, or snacks / waters?

Delayed an hour due to operational issues. Minimal apologies or care for the significant inconvenience caused. Landed at nearly 1am and they still couldn’t find ground staff to get us off the plane promptly.

The aircraft had several problems - from excess fuel to non operational ac. Two hours of delay in Chicago could have been avoided with proper planning and aircraft maintenance.

Crew in Columbia was not prepared for landing. It was a bit of a disaster and getting bags took forever.

We were upgraded to First Class and it was a great flight

Amazing I love American. I’ll never fly anyone else if I can help it.

We experienced gate changes and a long delay. My seat was dirty when I boarded and I had to use wipes to clean it myself. There was an unpleasant and overpowering cleaning product scent on the plane as well that lingered through the flight.

My carry on baggage was damaged. Entire trip, I had to carry the baggage. When complained to the boarding crew, they got mad at me and still asked me to valet check in the cabin baggage. Rude boarding crew!!!

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Frontier.. nickel and dime add-ons. Flight late, on time, late again, last minute gate change, arrival gate required a shuttle to the terminal. They sure keep you guessing.. if you like a little chaos and airport anxiety, this is the airline for you!

This is my second time flying with Frontier. My current experience was very favorable. The staff from the gate to the plane was friendly, warm and professional. The food options lacked in my opinion. This area needs some attention in my opinion.

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Better than expected. Staff were friendly and nice on both flights.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

Just know that everything, and I mean everything is “ala cart”. 60$ just to put something in the overhead bin. I will never fly Frontier again nor do I recommend them to anyone else.

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Everything you need to know for your flight from O'Hare Intl to Ontario

Information on your arrival and departure airports