ORD - ONT

$99 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 8/11. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 21% or moreCompare multiple travel sites with one search.

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

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

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

Everything you should know

Cheapest round-trip
$221
Typical prices: $316-$575
Frontier
Sat 9/12Tue 9/15
ORD - ONT • 1 stop
Cheapest non-stop
$239
United Airlines
Wed 8/19Sat 8/29
ORD - ONT • Non-stop
Top airlines
Cheapest • from $221 (round-trip)
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with United Airlines. Average duration is 4h 33m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $357 (round-trip)
Shortest trip • 5h 50m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 16% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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!
Flight Deals
Booking Insights
Expert advice
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

Sat, Sep 12 - Tue, Sep 15
Frontier Logo
11:06 am - 11:55 pm
ORD
-
ONT
14h 49m
1 stop
Frontier Logo
6:00 am - 9:35 pm
ONT
-
ORD
13h 35m
1 stop
$221Frontier
Tue, Jul 28 - Sat, Aug 1
Frontier Logo
9:57 pm - 10:04 am
ORD
-
ONT
14h 07m
1 stop
Frontier Logo
6:00 am - 8:52 pm
ONT
-
ORD
12h 52m
1 stop
$231Frontier
Wed, Aug 19 - Sat, Aug 29
United Airlines Logo
8:06 pm - 10:35 pm
ORD
-
ONT
4h 29mnonstop
United Airlines Logo
7:00 am - 1:10 pm
ONT
-
ORD
4h 10mnonstop
$239United Airlines
Sat, Aug 1 - Sat, Aug 22
Frontier Logo
7:29 am - 3:14 pm
ORD
-
ONT
9h 45m
1 stop
Frontier Logo
11:50 am - 7:02 pm
ONT
-
ORD
29h 12m
1 stop
$240Frontier
Sat, Aug 22 - Sat, Aug 29
Frontier Logo
2:41 pm - 11:50 pm
ORD
-
ONT
11h 09m
1 stop
Frontier Logo
7:56 pm - 1:36 pm
ONT
-
ORD
15h 40m
1 stop
$241Frontier
Tue, Jul 21 - Tue, Jul 28
Frontier Logo
5:46 pm - 7:32 am
ORD
-
ONT
15h 46m
1 stop
Frontier Logo
6:00 am - 8:52 pm
ONT
-
ORD
12h 52m
1 stop
$242Frontier
Wed, Aug 19 - Sat, Aug 29
Frontier Logo
2:41 pm - 11:50 pm
ORD
-
ONT
11h 09m
1 stop
Frontier Logo
6:00 am - 1:36 pm
ONT
-
ORD
29h 36m
1 stop
$244Frontier
Wed, Jul 29 - Wed, Aug 5
United Airlines Logo
8:18 pm - 10:51 pm
ORD
-
ONT
4h 33mnonstop
United Airlines Logo
1:50 pm - 12:59 am
ONT
-
ORD
9h 09m
1 stop
$245United Airlines
Wed, Jul 29 - Wed, Aug 5
Frontier Logo
9:57 pm - 11:50 pm
ORD
-
ONT
27h 53m
1 stop
Frontier Logo
1:38 pm - 5:37 am
ONT
-
ORD
13h 59m
1 stop
$248Frontier
Wed, Aug 19 - Sat, Aug 29
United Airlines Logo
8:06 pm - 10:35 pm
ORD
-
ONT
4h 29mnonstop
United Airlines Logo
1:56 pm - 10:30 pm
ONT
-
ORD
6h 34m
1 stop
$249United Airlines
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.

How much is a round-trip flight from Chicago O'Hare Intl Airport to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Chicago O'Hare Intl Airport to Ontario departing in September.

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 Sunday is the most expensive. Flying from Ontario back to Chicago O'Hare Airport, the best deals are generally found on Wednesday, 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 February, where tickets cost $385 (return) on average. On the other hand, the most expensive months are December and September, where the average cost of round-trip tickets is $576 and $524 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 $446 on average.

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$99
Most popular time to fly with an average 13% 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 5 days, the lowest price for a flight from Chicago O'Hare Intl Airport to Ontario was $99 for a one-way ticket and $221 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 737-900 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, 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 $385 and an overall rating of 7.8, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $513 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.

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 $203 or less one-way and $364 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 4 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.
7.8
DeltaOverall score based on 8452 reviews
7.2Food
8.1Boarding
8.5Crew
7.8Entertainment
7.8Comfort
Airline reviews

Very easy to use and convenient, you can perform any action within the same portal

10.0 ExcellentMurat, Apr 2026
ORD - LGA
Read more Delta reviews

Very easy to use and convenient, you can perform any action within the same portal

Okay considering we had weather delays which the Pilot notified us of immediately!

Everything could have benn better. Short fly, no food, no entertainment and no wifi.

Stop changing gates. Stop cancelling flights Stop moving my seat.

The staff was frielndly. The plane was terrible, it was too small and should be decommissioned. There were no back seat screens at all. The only beverages we had a choice from was coffee, tea or water. The only bathroom in the back was behind the flight attendant's jump seat and wasn't working. And I literally felt like I was sitting on top of the guy next to me. It was terribly hot in the plane and we had to sit on the tarmac in Chicago for 1/2 hour due to congestion in Mpls. Wouldn't they have know that before they even boarded us so that we could have sat in comfort in the terminal?

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.

It was very cold because the air conditioner was on high power, and my son got sick.

Horrible. Flight ORD to CGH was okay, but Paris was a nightmare. Old planes, delays, involuntary downgrades, broken planes, terrible communication. CGH to CPT was my worst flight ever.

The boarding process was terrible especially with an indirect flight Chicago to Seattle to San Diego was terrible talking about we overbooked a flight idk if I’d take this airline ever again we got off our flight from Chicago to Seattle and we traveled for business and they told us our connecting flight was over booked and their was no seats asking people to take a delayed next flight and they don’t tell anyone coughing to wear masks seats 30A-B were terrible during the flight no one wants to sit next to people coughing all around I don’t want to be sick traveling for work or get sick anytime it’s very upsetting the staff doesn’t take this stuff serious to tell them to wear masks when they see people coughing and sneezing

Delta airlines charge $ 30,oo US DOLLARS for the check in for a suitcase in the baggage hold

Know that the movies that you are going to be offered are the oldest be rated movies they could possibly get. They may have one or two new movies that they keep advertising but when you’re flying 15 hours, there is nothing to see past the first new movie.

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

Several missed and almost missed connections. It felt like everything was being patched together last minute without enough resources and it ended up being an extremely stressful experience that basically ruined our weekend on the west coast. What a waste.

Terrible, if possible won't be flying again anytime soon!

Subject: Formal Complaint: Discriminatory and Unprofessional Conduct – Request for Immediate Action & Compensation Dear [Airline Customer Relations Team], I am writing to file a formal complaint regarding my recent travel experience with [Airline], which was by far the worst I have ever encountered. What occurred was not only unprofessional, but in several instances discriminatory, unsafe, and unacceptable. On the first leg of my trip, I arrived only four minutes past check-in. Instead of making any attempt to resolve the matter, your representative flatly denied me boarding and made me wait while she attended to passengers who arrived after me. By the time a manager intervened, it was too late to board, costing me time, money, and unnecessary frustration. The second leg of my trip (Chicago–San Francisco) raised even more serious concerns. From the outset, it was apparent that the staff—particularly two attendants—prioritized Caucasian passengers while dismissing African American and minority passengers. • When a Caucasian passenger in the exit row refused to comply with federal safety requirements, I, as a first responder, immediately offered to switch seats and assume the responsibility. My offer was blatantly ignored, and instead, a Caucasian passenger seated further up was chosen. This was discriminatory and deeply insulting, especially as I was actively de-escalating the situation that could have delayed the flight further. • During a lengthy tarmac delay of over 90 minutes, passengers were given conflicting and unreasonable instructions that created unnecessary distress and tension. • Throughout the flight, a visibly intoxicated passenger directly in front of me was disruptive, rude to others, failed to comply with seatbelt and electronic device rules, and yet faced no enforcement from the crew. In stark contrast, I was singled out for repeated compliance checks even though I was following every rule. This unequal treatment was so obvious that multiple passengers around me spoke up in my defense. This pattern of behavior demonstrated a clear lack of professionalism, disregard for passenger safety, and discriminatory treatment. I expect far better from an airline of your stature. As a paying customer subjected to this unacceptable treatment, I am formally requesting: 1. A full investigation into the conduct of the staff on both flights. 2. A written apology acknowledging the discriminatory and unprofessional behavior I endured. 3. Appropriate compensation for the distress, inconvenience, and mishandling of my travel. If this matter is not addressed promptly and thoroughly, I will have no choice but to escalate my complaint further, including filing with the U.S. Department of Transportation and sharing my experience through other channels. I trust [Airline] will take this complaint seriously and provide a timely resolution.

Check in was quick and easy during early hours. Flight was on time, and customer services was a plus.

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

We arrived early and finally made it to our gate almost an hour after.

Was a pain having to leave the plane and reboard but glad the plane was fixed

My flight was delayed for a whole day, so I lost a day of my vacation.

It was so much better than expected, Ohare is not such a pleasant experience but American Airlines with the new, clean aeroplane and free Wi-Fi was outstanding and the crew so pleasant and helpful.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

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

My boarding pass wouldn't pull up in the app very easily and had to really dig through my email. That caused a delay in TSA..

Baby cried a lot. Nothing anyone could do about it. Just part of flying.

The flight crew was fantastic! Which the seats had a small TV.

My husband and I pre-ordered our food, but they did not have my husband’s order, and my cheese plate was very average. I asked for a blanket and was told they don’t carry blankets on domestic routs. The flight was on time and smooth!

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.

Boarding was a mess - the agent basically called every group in rapid succession, so there was no organization at all. The economy seats are a joke, and main cabin extra seats were sold out when I purchased my flight. As such, I was locked in the same position for four hours. Being 6’6”, it was impossible to get my bag out from under the seat in front of me, and I couldn’t have used my laptop even if my bag were accessible due to the minuscule seat pitch. Also the wifi was broken. American is a joke - can’t wait until they merge with Spirit.

Horrible scam. Make you pay extra for more leg room then switch your seat as you’re boarding to a regular seat. Never fly American!

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

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.

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

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

I didn’t have enough time to catch my connecting flight and had to use a different Airline. I will be requesting a refund.

Flight was cancelled and was not able to get another flight thru Frontier. Per frontier a refund was issued but I do not see a refund on my Afirm account.

I brought a ticket and car rental through Travelocity. There was no where to add a KTN. So I thought i’d add it by looking up ticket on frontier website. I tried 3 times with the frontier chat bot to add my KTN it never updated my boarding pass. So then I tried showing up early to do it in person at the airport. The first employee update my ktn in the system and gave me a new boarding pass. I was sent back by tsa to join regular line. Then I was told to add my Ktn. It would cost me $25 extra. Given the length of the cue I did pay. Congratulations! BUT I will NEVER fly frontier again. Plus the plane was very old. It had actual ashtrays and old looking tray backs. Worst travel experience ever. Im warning my friends and family not to use frontier ever.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Was charged 99 dollars for a bag despite agents previously telling me it would be ok. Customer service was unhelpful

I will like you ( Frontier Airlines) to fly into LAX instead of ONT because I live in LA and the subway takes me to my house in just 15 minutes

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

Information on your arrival and departure airports