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$69+ Cheap flights from Ontario (ONT) to Chicago (CHI)

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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — CHI
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
1 adult, Economy
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Find cheap flights from Ontario to Chicago 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

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Cheapflights Tip: The best prices from Ontario to Chicago are usually found in June or September, booked 88 days in advance, depart on a Thursday or Wednesday and return on a Thursday

Cheap flight deals from Ontario to Chicago

Cheapest flights from Ontario to Chicago
Explore the most affordable flight options available from Ontario to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

This CheapOair deal was found by Cheapflights users on 12/15. 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.
Wed 12/316:45 amONT - ORD
1 stop15h 27mFrontier
Sun 1/410:49 pmORD - ONT
1 stop20h 26mFrontier
Deal found 12/15$185
This CheapOair deal was found by Cheapflights users on 12/16. 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.
Wed 12/316:45 amONT - ORD
1 stop15h 27mFrontier
Thu 1/17:57 pmORD - ONT
1 stop13h 22mFrontier
Deal found 12/16$209
This CheapOair deal was found by Cheapflights users on 12/14. 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.
Wed 12/246:20 pmONT - ORD
1 stop23h 01mFrontier
Sun 1/410:49 pmORD - ONT
1 stop24h 28mFrontier
Deal found 12/14$218
This Frontier deal was found by Cheapflights users on 12/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:00 amONT - ORD
1 stop6h 17mFrontier
Thu 1/17:57 pmORD - ONT
1 stop13h 22mFrontier
Deal found 12/16$232
This CheapOair deal was found by Cheapflights users on 12/16. 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.
Mon 12/296:20 pmONT - ORD
1 stop27h 21mFrontier
Sun 1/410:49 pmORD - ONT
1 stop20h 26mFrontier
Deal found 12/16$235
This Trip.com deal was found by Cheapflights users on 12/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/205:16 pmONT - ORD
1 stop26h 23mFrontier
Sun 1/410:49 pmORD - ONT
1 stop20h 26mFrontier
Deal found 12/14$238
This CheapOair deal was found by Cheapflights users on 12/16. 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.
Wed 12/316:45 amONT - ORD
1 stop15h 27mFrontier
Fri 1/27:00 amORD - ONT
1 stop18h 59mFrontier
Deal found 12/16$239
This CheapOair deal was found by Cheapflights users on 12/15. 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.
Mon 12/226:00 pmONT - ORD
1 stop18h 17mFrontier
Thu 12/257:00 amORD - ONT
1 stop18h 59mFrontier
Deal found 12/15$255
This CheapOair deal was found by Cheapflights users on 12/15. 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.
Mon 12/296:00 pmONT - ORD
1 stop18h 17mFrontier
Thu 1/17:57 pmORD - ONT
1 stop13h 22mFrontier
Deal found 12/15$259
This CheapOair deal was found by Cheapflights users on 12/15. 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.
Sun 12/216:45 amONT - MDW
1 stop13h 05mFrontier
Sun 1/410:50 pmMDW - ONT
1 stop27h 09mFrontier
Deal found 12/15$353
This Expedia deal was found by Cheapflights users on 12/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:45 amONT - MDW
1 stop13h 05mFrontier
Tue 12/308:00 amMDW - ONT
1 stop9h 46mFrontier
Deal found 12/15$397
This CheapOair deal was found by Cheapflights users on 12/15. 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.
Tue 12/306:45 amONT - MDW
1 stop11h 10mFrontier
Sun 1/410:50 pmMDW - ONT
1 stop27h 09mFrontier
Deal found 12/15$398

Find flight deals from Ontario to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Chicago (CHI). 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 December 16, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$157
(Kiwi.com)

One-way from

$69
(Trip.com)

Popular in

December

Cheapest in

June

Average price

$543

Good round-trip deal

$370 or less

Good one-way deal

$183 or less
Provider with most accurate pricing for Ontario-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Chicago (CHI) flights.
Search Deals
From Ontario to Chicago (CHI)
Search Deals
One-way flight from Ontario to Chicago (CHI)
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($64 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Ontario to Chicago (CHI).
Search Deals
Price to beat on a one-way flight from Ontario to Chicago (CHI).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Chicago 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 December 16, 2025.
Use the filters below to find and compare flights from Ontario to Chicago that are best for you.

Fly from

Ontario

Fly to

Chicago

Route

Depart

Return

Price

OntarioChicago

ONT - MDW

ONTMDW

Ontario

Wed 2/18

7:30 am-1:56 pm

2 stops28h 26m

Chicago Midway

Sun 2/22

3:00 pm-12:23 pm

1 stop23h 23m

$208

OntarioChicago

ONT - ORD

ONTORD

Ontario

Thu 1/8

7:30 am-11:53 pm

1 stop14h 23m

Chicago O'Hare Intl

Tue 1/13

7:30 am-1:56 pm

1 stop8h 26m

$305

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 1/14

7:30 am-9:43 pm

2 stops12h 13m

Chicago O'Hare Intl

Thu 1/29

2:20 pm-11:58 pm

2 stops11h 38m

$316

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sat 1/17

7:56 pm-2:38 pm

2 stops16h 42m

Chicago O'Hare Intl

Thu 1/22

3:35 pm-10:59 am

1 stop21h 24m

$319

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 1/6

1:11 pm-9:52 pm

1 stop6h 41m

Chicago O'Hare Intl

Tue 1/13

7:30 am-10:51 pm

1 stop17h 21m

$323

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 1/7

10:30 pm-8:43 am

1 stop8h 13m

Chicago O'Hare Intl

Tue 1/13

7:30 am-10:51 pm

1 stop17h 21m

$323

OntarioChicago

ONT - ORD

ONTORD

Ontario

Mon 2/9

6:00 am-11:50 pm

1 stop15h 50m

Chicago O'Hare Intl

Tue 2/10

8:00 am-3:08 pm

1 stop9h 08m

$324

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 1/14

4:03 pm-5:10 pm

1 stop23h 07m

Chicago O'Hare Intl

Wed 1/21

6:06 pm-3:08 pm

1 stop23h 02m

$324

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 2/18

6:14 am-12:01 pm

1 stop27h 47m

Chicago O'Hare Intl

Mon 2/23

7:00 am-11:08 am

1 stop30h 08m

$324

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 3/4

4:02 pm-12:01 pm

1 stop17h 59m

Chicago O'Hare Intl

Mon 3/9

1:00 pm-11:32 pm

1 stop12h 32m

$324

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 54 results
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6

Compare providers for flights from Ontario to Chicago

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 Chicago in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars

*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 flights, users find the pricing of Justfly.com to be most consistent on Cheapflights vs. Justfly.com Users can find the same prices on Ontario-Chicago flight deals on Cheapflights vs. Justfly.com >95% of the time. Price accuracy is based on data collected from Ontario-Chicago flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Chicago flights, Cheapflights users trust Justfly.com the most. Justfly.com 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 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 Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago 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

How far ahead should I book a flight from Ontario to Chicago?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Chicago. Price data was last updated on December 12, 2025.

The best time to book flights from Ontario to Chicago is 88 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Ontario to Chicago?

Currently, March is the cheapest month in which you can book a flight from Ontario to Chicago (average of $77). Flying from Ontario to Chicago in October is currently the most expensive (average of $147). 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 CHI?

Find hourly flight availability from Ontario to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 16, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 49% on flights from Ontario to Chicago by exploring options for tickets in the afternoon.

What is the cheapest day to fly from Ontario to Chicago?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Chicago. Price data was last updated on December 13, 2025.

Travelers seeking maximum savings on their Ontario to Chicago flight should consider departing on Thursday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Ontario to Chicago flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Ontario to Chicago trip
Airports
ONT

For business travelers, ONT offers a smooth security process, often quicker than LAX, making it ideal for weekday commutes.

Read more about ONTBy Bill Fink
MDW

Use the Orange Line train for a quick, budget-friendly trip from MDW to downtown Chicago in under 30 minutes.

Read more about MDWBy Ramsey Qubein
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on MDW

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Bill Fink

Bill Fink

Expert on ONT

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more

Reviews of airlines servicing Chicago

Get insights into the airlines that provide service to Chicago. 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 Chicago. Reviews last updated December 16, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Ontario to Chicago have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Entertainment

7.5

Overall

7.9

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
7.9
Good
4,250 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Entertainment

7.5

Overall

7.9

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Delta
7.9
Good
8,008 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Entertainment

7.5

Overall

7.9

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
United Airlines
7.4
Good
9,092 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Entertainment

7.5

Overall

7.9

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.2
Good
11,049 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Entertainment

7.5

Overall

7.9

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Frontier
5.8
Fair
3,082 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Entertainment

7.5

Overall

7.9

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Chicago. 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?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Chicago. You should not have trouble finding flights to Chicago from Ontario; the airport handles an average of 0 outbound flights to Chicago per day. You should also have plenty of airline options to choose from since 5 airlines have flights from the Ontario airport to Chicago. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

  • How long is the flight from Ontario to Chicago?

    Frontier can get you from Ontario to Chicago in just under 13h 14m. Your travel time can differ by up to . The distance from Ontario to Chicago is about 1695 mi.

  • What are the cheapest airlines flying from Ontario to Chicago round-trip?

    Cheapflights users have booked flights from Ontario to Chicago round-trip from $102. Other airlines that can offer you cheap pricing are United Airlines, from $226, and Southwest, from $237. These flights start at 73% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Ontario to Chicago one-way?

    The cheapest airlines for a one-way flight from Ontario to Chicago are Frontier ($80), Southwest ($113), and United Airlines ($113).

  • What are the most popular routes from Ontario to Chicago?

    Most travelers choose Ontario - Chicago O'Hare Intl, Ontario - Chicago Midway or Ontario - Chicago Greater Rockford when deciding on the best route from Ontario to Chicago.

  • What are the cheapest flights from Ontario to Chicago?

    On average you can expect to pay $420 for a flight from Ontario to Chicago. The cheapest flight overall is $159 while the most popular route, (Ontario - Chicago O'Hare Intl) is currently priced at $182.

  • Can I find deals for flights from Ontario to Chicago that include hotel bookings?

    Yes. In addition to deals on Ontario to Chicago flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Chicago?

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

  • Can I find deals for business class flights from Ontario to Chicago?

    Yes. Cheapflights offers flight deals from Ontario to Chicago 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?

    Currently, March is the cheapest month in which you can book a flight from Ontario to Chicago (average of $77). Flying from Ontario to Chicago in October is currently the most expensive (average of $147). 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?

Book flights to Chicago if you plan to visit one of these locations
Lansing
Merrillville
Hammond
Porter
Benton Harbor

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Alternative routes for Ontario to Chicago

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 Chicago

Discover the top 5 airlines that operate flights from Ontario to Chicago. 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 December 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$110Average$225FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$227Average$398FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$237Average$418FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$246Average$428FlexibilityNo cancel feeOn-time71%
DeltaCheapest$256Average$355FlexibilityNo cancel feeOn-timeN/A

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