ORD - ONT

$78 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 11/3. 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

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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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

Sat, Oct 4 - Sat, Oct 11
Frontier Logo
8:25 am - 7:54 pmORD-ONT
13h 29m1 stop
Frontier Logo
7:04 am - 11:53 pmONT-ORD
14h 49m1 stop
$147Frontier
Find Deal
Sat, Sep 27 - Sat, Oct 4
Frontier Logo
8:25 am - 7:54 pmORD-ONT
13h 29m1 stop
Frontier Logo
8:59 pm - 9:37 amONT-ORD
10h 38m1 stop
$148Frontier
Find Deal
Thu, Sep 18 - Sat, Sep 20
Frontier Logo
6:00 am - 7:54 pmORD-ONT
15h 54m1 stop
Frontier Logo
8:59 pm - 9:37 amONT-ORD
10h 38m1 stop
$149Frontier
Find Deal
Thu, Sep 25 - Sat, Oct 11
Frontier Logo
4:03 pm - 6:35 pmORD-ONT
28h 32m1 stop
Frontier Logo
7:04 am - 11:53 pmONT-ORD
14h 49m1 stop
$153Frontier
Find Deal
Mon, Sep 22 - Fri, Oct 3
Frontier Logo
9:54 pm - 9:56 pmORD-ONT
26h 02m1 stop
Frontier Logo
8:59 pm - 9:28 pmONT-ORD
22h 29m1 stop
$154Frontier
Find Deal
Mon, Nov 3 - Fri, Nov 7
Frontier Logo
1:36 pm - 6:49 pmORD-ONT
7h 13m1 stop
Frontier Logo
1:46 pm - 11:44 pmONT-ORD
7h 58m1 stop
$156Frontier
Find Deal
Mon, Sep 29 - Sat, Oct 11
Frontier Logo
10:42 am - 7:54 pmORD-ONT
11h 12m1 stop
Frontier Logo
8:34 am - 11:59 pmONT-ORD
13h 25m1 stop
$158Frontier
Find Deal
Sun, Oct 5 - Fri, Oct 10
Frontier Logo
1:03 pm - 7:17 amORD-ONT
20h 14m1 stop
Frontier Logo
12:32 pm - 8:14 pmONT-ORD
29h 42m1 stop
$160Frontier
Find Deal
Mon, Sep 22 - Sun, Oct 5
 Logo
9:00 am - 8:56 pmORD-ONT
13h 56m1 stop
 Logo
12:28 pm - 10:45 pmONT-ORD
8h 17m1 stop
Thu, Sep 18 - Mon, Sep 22
 Logo
4:03 pm - 6:35 pmORD-ONT
28h 32m1 stop
 Logo
9:46 pm - 6:51 pmONT-ORD
19h 05m2 stops

Everything you should know

Our travelers' advice
AI-generated summary based on content written by travel experts
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
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 33% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
April
Cheapest • 24% price drop
November
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$147
Overall average: $249
Frontier
Sat 10/4Sat 10/11
ORD - ONT • 1 stop
Cheapest non-stop
$329
United Airlines
Tue 9/30Tue 10/7
ORD - ONT • Non-stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Expert advice

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

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
ORD

At O'Hare, security lines can exceed 30 minutes during peak times. Arrive early to ensure a smooth departure.

Read more about ORDby Stefanie Waldek
ONT

For a budget-friendly arrival at ONT, use Omnitrans Bus Route 61, connecting to local transit centers every 15 minutes during peak hours.

Read more about ONTby Jennifer Simonson
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on ORD

Stefanie Waldek

Stefanie Waldek

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.

Read more
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson

Jennifer Simonson

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.

Read more
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, Wednesday 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 $246 (return) on average. On the other hand, the most expensive months are December and August, where the average cost of round-trip tickets is $480 and $402 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 $268 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 33% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 8 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$78
Best time to beat the crowds but there is an average 13% increase in price.
Most popular time to fly and prices are also 1% lower on average.
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 $78 for a one-way ticket and $147 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?

    Only American Airlines offers 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 737-800 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?

    Star Alliance is the only airline alliance operating flights between Chicago O'Hare Airport and Ontario.

  • 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 $484 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 $280 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 $205 or less one-way and $327 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 4241 reviews
8.1Boarding
8.6Crew
8.0Comfort
7.0Food
7.5Entertainment
Airline reviews

Better and more food and drinks. Put msnbc and free speech tv on the news channel selection list.

10.0 ExcellentKevin, Jul 2025MDW - PUJ
Read more Southwest reviews

Better and more food and drinks. Put msnbc and free speech tv on the news channel selection list.

Very smooth checking in our luggage with a super pleasant SW agent. I enjoyed a fun entertaining movie.

after landing, we stay 2 hours on the taxi way before reaching the gate The airline and the crew were good though

First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.

I'm not a fan of Southwest's model. I don't like the herding style of boarding.

It was a perfect flight in all aspects! Both legs!

Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.

My flight to Chicago left and landed early. My return flight left two minutes late and arrived 2 minutes late. My seat selections were ideal! There were no snacks going to Chicago and no snacks on the return trip. There are no charging outlets on board.

I was uncomfortably cold on the plane. Other than that it was uneventful and therefore as enjoyable as a plane ride can be.

Food was surprisingly good but the WiFi was not great

My flight was extremely cold. I had a jacket and a cover was left in each seat. The cover was extremely thin and I have a disability, fibromyalgia and arthrithis and AC air is the worst. I closed my vent and my husbands vent and it still was frigid. I asked the attendant if I could get another cover and she quickly almost dismissively and totally unconcerned stating, (I quote) (one per chair) and walked off so quickly that I didn't get a chance to explain to her that I literally have adisability. I didnt want to make a seen so I set on that flight for over 5 hours in pain, joints locking up and extremely uncomfortable. When my fibromyalgia flares up my joints not only ache but they will lock up also and it takes me days to get back to my regular self even though I take medication for it. I felt like it would not have hurt anyone at all for her to just give me an extra cover because I'm sure they have all types of medical issues in people that fly every day.

Not a "Delta" issue, but a JFK issue: We booked a connecting flight with 3 1/2 hours between to clearn immigration and customs. Our inbound flight (BCN to JFK) was on the taxiway 45 minutes which ate into our layover time. Immigtration was insanely quick with the CBP MPC app; however, clearing TSA (again, after we were ALREADY cleared in Spain on the inbound international flight) took over 95 minutes. This left us with 10 minutes before boarding the connecting flight (JFK to SAN) to walk to the far end of Terminal 4 and try to find food. We didn't find any food that could promise to serve us in under 10 minutes so we boarded the Delta flight after coming off a plance and an 8-hour flight knowing that we wouldn't be served any food on the next 5 1/2 hour flight. I feel like Delta needs to put pressure on the JFK TSA to open more screening stations (by our count, we saw only 5 scanners open and a line of - as we said - over 90 minutes. The insult is that we WERE ALREADY SCREENED through TSA, but as you come off one flight into the USA, you have to go through the whole process again. It seems like if you have a connecting flight, there should be a way to pass through immigration and customs without needing to return through TSA.

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

The entertainment and wifi mostly didn't work on this flight.

Terrible entertainment system - kept freezing and audio kept cutting out. Snacks were mediocre at best for a 5 hour flight.

I am still upset that my bag was lost on a recent trip to Rome ; we were inconvenienced and out €150 Euros ; delta has refused to reimburse us

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Once we got in the air the pilot made up some of the time of the delay. So that was really nice.

Excellent flight. Boarding was efficient and departure was on time. Smooth flight with on time arrival. Deplaning was also efficient.

It was delayed instead of departing at 9:20pm, we departed at 11pm… putting us in Columbus after 2am! It was awful. Had I known about the delay, I could have spent some time in the United Lounge… I was starving because I started my journey in Budapest… so I was exhausted and hungry. Plus I had to make new arrangements to be picked up at the airport in Columbus, instead of midnight it was 2:30 am after getting luggage and out of airport. Not feasible. I would have just stayed in Chicago for the night and gotten a morning flight.

It was great, I’m very grateful for the pilots and crew flight attendants for everything.

Evidently, my seat had the only broken TV. I couldn’t plug it in, get it to come on, or watch anything, and of course, no one could fix it while we were on the plane. The service was good and the boarding was quick

I was charged for my daughters bag when I am supposed to receive two free checked bags with my United Explorer card.

The schedule to Moline changed 5 times. The gate changed 6 times. That is a pathetic way to run an airline. No wonder that no one in our company flies on United Express to or from Moline. Changes happen most of the time. I learned my lesson on this trip…never again!

Flight was great. Efficient boarding. Short flight. Early arrival. Friendly flight crew. The entertainment system did not work well. Could not access it until the aircraft reached 10K feet or more. Lots of glitches.

A bit rush for transit. Food and entertainment are not available

Smooth boarding process. Early departure, smooth flight, early arrival. The entertainment package has very good recent movie options. The flight crew were friendly and professional.

3 hour weather delay followed by 1 hour (and counting) maintenance delay. UGH!

After we'd boarded , they canceled the flight. The crew didn't even know , we just all received text messages. Then after they deplaned us , AA was just like "too bad, go F your self, we sure ain't gonna help you"

After a two hour delay, my flight was CANCELLED! No pilot available. Such BS.

Amazing food, great staff, with one noticable detail missing ...but no seat entertainment in any of aircraft ...I am not a fan

I wish American Airlines would change the airline industry by loading the plane back to front instead of front to back. Planes would board so much more smoothly and quickly.

I have long legs, my foot was out in the aisle and when a flight attendant came walking by and I didn't notice, instead of saying "excuse me" or anything like that, she kicked my foot. Extremely rude

Excellent! The gate agents were kind enough to rebook me on an earlier flight saving me from a 6 hour layover. Even my luggage made it despite the fact that the connection was technically too narrow. The flight itself was very comfortable, roomy, and clean. Plenty of space for my carryon items with plugs to charge my phone. After a long international flight of 14 hours, this was an excellent way to end my travels!

Great experience. Flight boarded easily. Departed early. Smooth flight. Great arrival in DC--almost no taxing! Almost direct to gate from runway. Crew was terrific. Same cookies and beverages in main cabin. I did not use the entertainment system on this flight.

Most of the delay was due to weather which is not what was at issue here. One delay was due to a missing flashlight and in the end the flashlight was actually found on the plane. The entertainment system is very limited. Live TV options offer only a few channels that are not very appealing. Boarding and deplaning are always difficult. It just takes too much time to get on and off the plane. On the plus side, I missed my connecting flight, but was easily able to book a later flight from the app while enroute.

You were more on time than United. I'm so over united delays.

Seats were new and comfortable. Staff was fine. Missed my connection due to weather -which wasn’t their fault- but got no help at all. Gate staff sent me to customer service, which was and stayed unstaffed. Sign with QR code directed me to call or chat. Chat was useless. Call was returned after an hour. No itinerary offered by Frontier could get me home in less than 30 hours. Rebooked with another airline and got a partial refund that came to about 10 percent of what I paid to get home.

Finally a Frontier on time and efficient. I've had problems before with your airline, but this time everything went fine.

The experience was good. No frills but I got there safe and sound and on time.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

sluggish boarding and arrival procedures, fake nice flight attendants, and lots of delays.

Disaster. They lied every step of the way. We ended up being delayed due to crew and then allegedly abandoned the flight because of a curfew at LGA. No rebooking to LGA at any reasonable time. No hotel. No meal vouchers. Had to sleep in the airport and fly to Newark instead. Will never fly Frontier again.

What I expected, nickeled and dined and a frontier flight attendant loudly complained about her job and lack of communication as she headed to the gate on her cell phone. Not professional.

As every law enforcement agency I could imagine surrounded the plane and we didn’t disembark for 2 hours and then had to stick around for another hour to go get our personal belongings after leaving them behind and being bused away from the plane, it was scary and inconvenient. We were given no information as to why this was happening. Lack of communication with passengers was disappointing.

After boarding and un-boarding twice over 6+hours, the flight was canceled.

Severe turbulence. Captain never came on to reassure passengers after things settled down.

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

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