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O'Hare Intl

$62+ Cheap flights from Ontario (ONT) to O'Hare Intl (ORD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ORD
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Find cheap flights from Ontario to O'Hare Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Ontario to Chicago O'Hare Intl are usually found in February or April, booked 51 days in advance, depart on a Thursday or Saturday and return on a Tuesday

Cheap flight deals from Ontario to O'Hare Intl

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to O'Hare Intl (ORD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$169
(Kiwi.com)

One-way from

$62
(Trip.com)

Popular in

January

Cheapest in

February

Average price

$487

Good round-trip deal

$405 or less

Good one-way deal

$218 or less
Provider with most accurate pricing for Ontario-Chicago O'Hare Intl flight deals.
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Provider most trusted by Cheapflights users for Ontario-Chicago O'Hare Intl flights.
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From Ontario to Chicago O'Hare Intl
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One-way flight from Ontario to Chicago O'Hare Intl
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Highest demand for flights based on searches. 10% potential increase in price ($47 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Ontario to Chicago O'Hare Intl.
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Price to beat on a one-way flight from Ontario to Chicago O'Hare Intl.
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Find flight deals from Ontario to O'Hare Intl

Cheapest flights from Ontario to O'Hare Intl
Explore the most affordable flight options available from Ontario to O'Hare Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 3, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/122:05 pmONT - ORD
1 stop28h 04mMultiple Airlines
Sun 1/115:05 amORD - ONT
2 stops20h 54mMultiple Airlines
Deal found 11/1$169
This Kiwi.com deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/46:15 amONT - ORD
2 stops15h 57mMultiple Airlines
Sat 12/69:14 pmORD - ONT
1 stop21h 19mMultiple Airlines
Deal found 11/1$172
This CheapOair deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:53 amONT - ORD
1 stop15h 22mFrontier
Mon 11/171:36 pmORD - ONT
1 stop7h 13mFrontier
Deal found 11/2$176
This Kiwi.com deal was found by Cheapflights users on 10/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/171:46 pmONT - ORD
1 stop7h 58mFrontier
Thu 12/45:05 amORD - ONT
2 stops19h 24mFrontier
Deal found 10/31$178
This Kiwi.com deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/122:05 pmONT - ORD
1 stop28h 04mMultiple Airlines
Mon 12/157:00 amORD - ONT
2 stops9h 04mMultiple Airlines
Deal found 11/2$179
This Gotogate deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:15 amONT - ORD
1 stop27h 27mFrontier
Sun 12/143:47 pmORD - ONT
1 stop26h 46mFrontier
Deal found 11/3$180
This Kiwi.com deal was found by Cheapflights users on 10/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/171:46 pmONT - ORD
1 stop7h 58mFrontier
Fri 12/54:20 pmORD - ONT
2 stops24h 05mFrontier
Deal found 10/31$182
This Kiwi.com deal was found by Cheapflights users on 10/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/167:44 pmONT - ORD
2 stops15h 01mFrontier
Mon 12/812:59 pmORD - ONT
1 stop10h 18mFrontier
Deal found 10/31$183
This Priceline deal was found by Cheapflights users on 11/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1312:05 pmONT - ORD
1 stop10h 10mFrontier
Sun 11/169:24 amORD - ONT
1 stop7h 21mFrontier
Deal found 11/2$184
This Kiwi.com deal was found by Cheapflights users on 11/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:15 amONT - ORD
1 stop27h 27mFrontier
Sun 1/115:05 amORD - ONT
2 stops20h 54mFrontier
Deal found 11/1$185
This Kiwi.com deal was found by Cheapflights users on 10/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/141:46 pmONT - ORD
1 stop7h 58mFrontier
Thu 12/45:05 amORD - ONT
2 stops19h 24mFrontier
Deal found 10/31$186
This Kiwi.com deal was found by Cheapflights users on 10/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1512:05 pmONT - ORD
1 stop9h 24mFrontier
Fri 12/54:20 pmORD - ONT
2 stops24h 05mFrontier
Deal found 10/31$188

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to O'Hare Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 3, 2025.
Use the filters below to find and compare flights from Ontario to Chicago O'Hare Intl Airport that are best for you.

Fly from

Ontario

Fly to

O'Hare Intl

Route

Depart

Return

Price

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sat 1/24

11:53 am-11:50 pm

1 stop9h 57m

Chicago O'Hare Intl

Sat 1/31

8:00 am-3:08 pm

1 stop9h 08m

$318

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sun 12/14

7:10 am-1:09 pm

1 stop27h 59m

Chicago O'Hare Intl

Sun 1/18

8:00 am-5:03 pm

2 stops11h 03m

$408

OntarioChicago

ONT - ORD

ONTORD

Ontario

Mon 11/24

7:00 am-5:01 am

1 stop20h 01m

Chicago O'Hare Intl

Wed 12/10

2:05 pm-8:03 pm

1 stop7h 58m

$420

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 12/2

7:10 am-1:09 pm

1 stop27h 59m

Chicago O'Hare Intl

Tue 1/6

6:08 pm-3:08 pm

1 stop23h 00m

$420

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 12/24

4:36 pm-12:13 pm

1 stop17h 37m

Chicago O'Hare Intl

Wed 12/31

7:00 am-11:59 pm

1 stop18h 59m

$422

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 12/2

6:00 am-4:55 pm

1 stop8h 55m

Chicago O'Hare Intl

Tue 12/9

10:00 am-6:33 pm

1 stop10h 33m

$435

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 12/24

4:36 pm-5:02 am

2 stops34h 26m

Chicago O'Hare Intl

Sun 1/4

7:00 am-5:11 pm

1 stop12h 11m

$438

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 12/11

12:13 pm-10:30 pm

1 stop8h 17m

Chicago O'Hare Intl

Tue 12/16

10:00 am-6:33 pm

1 stop10h 33m

$444

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 12/23

6:04 am-5:05 pm

1 stop9h 01m

Chicago O'Hare Intl

Sat 12/27

7:55 pm-10:25 pm

Nonstop4h 30m

$473

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 12/18

11:59 pm-5:50 am

Nonstop3h 51m

Chicago O'Hare Intl

Sat 12/20

7:55 pm-10:25 pm

Nonstop4h 30m

$473

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 23 results
1
2
3

Compare providers for flights from Ontario to O'Hare Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to O'Hare Intl in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Chicago O'Hare Intl Airport flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Chicago O'Hare Intl Airport flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ontario-Chicago O'Hare Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Chicago O'Hare Intl Airport flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Chicago O'Hare Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to O'Hare Intl

Have a flexible travel schedule? Discover the best time to fly to O'Hare Intl from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Chicago O'Hare Intl Airport

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to O'Hare Intl. Price data was last updated on October 31, 2025.

The price you pay for your flight from Ontario to Chicago O'Hare Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 51 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Ontario to Chicago O'Hare Intl Airport?

Currently, March is the cheapest month in which you can book a flight from Ontario to Chicago O'Hare Intl Airport (average of $77). Flying from Ontario to Chicago O'Hare Intl Airport in November is currently the most expensive (average of $141). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to ORD?

Find hourly flight availability from Ontario to O'Hare Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 3, 2025.

It’s typically best to fly out from Ontario to Chicago O'Hare Intl Airport in the afternoon. Doing so could potentially save you 52% on the flight price compared to flying in the evening, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to O'Hare Intl. Price data was last updated on October 26, 2025.

Travelers seeking maximum savings on their Ontario to Chicago O'Hare Intl Airport flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Ontario to Chicago O'Hare Intl Airport?

Reviews of airlines servicing O'Hare Intl

Get insights into the airlines that provide service to O'Hare Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to O'Hare Intl. Reviews last updated November 3, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from Ontario to Chicago O'Hare Intl Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
7.9
Good
8,002 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,997 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,038 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,117 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Ontario to O'Hare Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Chicago O'Hare Intl?

    Located just 3.1 mi from the city center, Ontario is the airport most travelers will use when flying to Chicago O'Hare Intl from Ontario. Booking flights from Ontario (ONT) to Chicago O'Hare Intl should be relatively easy as there are 0 daily outbound flights to Chicago O'Hare Intl from 5 different airlines.

  • How long is the flight from Ontario to Chicago O'Hare Intl Airport?

    There are many flights that can get you from Ontario to Chicago O'Hare Intl Airport in 9h 57m. Fly via Alaska Airlines to get the fastest option. There are 1695 mi between Ontario and Chicago O'Hare Intl Airport.

  • What are the cheapest airlines flying from Ontario to Chicago O'Hare Intl Airport round-trip?

    Our cheapest airline available from Ontario to Chicago O'Hare Intl Airport is Frontier. Our recent data shows that you can find tickets from as low as $110 on this airline. Additional options worth looking into are United Airlines and American Airlines, starting at $227 and $246 round-trip. Frontier is currently priced 71% below the average price you’ll pay for this route.

  • What are the cheapest flights from Ontario to Chicago O'Hare Intl Airport?

    On average you can expect to pay $671 for a flight from Ontario to Chicago O'Hare Intl Airport. The cheapest flight overall is $183 while the most popular route, (Ontario - Chicago O'Hare Intl) is currently priced at $130.

  • Can I find deals for flights from Ontario to O'Hare Intl that include hotel bookings?

    Yes. In addition to deals on Ontario to O'Hare Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to O'Hare Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to O'Hare Intl.

  • Can I find deals for business class flights from Ontario to O'Hare Intl?

    Yes. Cheapflights offers flight deals from Ontario to O'Hare Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, March is the cheapest month in which you can book a flight from Ontario to Chicago O'Hare Intl Airport (average of $77). Flying from Ontario to Chicago O'Hare Intl Airport in November is currently the most expensive (average of $141). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Chicago O'Hare Intl Airport?

Book flights to Chicago O'Hare Intl Airport if you plan to visit one of these locations
Schaumburg
Rosemont
Skokie
Des Plaines
Gurnee
Hoffman Estates
Beloit
Elgin
Oak Brook
Elk Grove Village
Naperville
Racine
Downers Grove
Rockford
Orland Park
Merrillville
Bridgeview
Warrenville
Waukegan
Aurora

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Alternative routes for Ontario to O'Hare Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to O'Hare Intl

Discover the top 5 airlines that operate flights from Ontario to O'Hare Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$110Average$214FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$227Average$393FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$246Average$474FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$246Average$440FlexibilityNo cancel feeOn-time63%
DeltaCheapest$256Average$357FlexibilityNo cancel feeOn-timeN/A

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