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O'Hare Intl

$69+ 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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ORD
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
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

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Cheapflights Tip: The best prices from Ontario to Chicago O'Hare Intl are usually found in April or August, 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

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 December 18, 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 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
Wed 12/319:34 pmORD - ONT
1 stop13h 19mFrontier
Deal found 12/16$208
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.
Thu 12/256:00 amONT - ORD
1 stop6h 17mFrontier
Sun 1/410:49 pmORD - ONT
1 stop20h 26mFrontier
Deal found 12/16$209
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.
Wed 12/246:20 pmONT - ORD
1 stop23h 01mFrontier
Sun 1/410:49 pmORD - ONT
1 stop20h 26mFrontier
Deal found 12/16$235
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 Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Tue 12/306:00 amONT - ORD
2 stops40h 12mFrontier
Sun 1/410:49 pmORD - ONT
1 stop20h 26mFrontier
Deal found 12/17$251
This Super.com 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 Super.com 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
Mon 1/57:00 amORD - ONT
1 stop18h 59mFrontier
Deal found 12/16$258
This Gotogate 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 Gotogate 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
Fri 1/27:00 amORD - ONT
1 stop18h 59mFrontier
Deal found 12/16$268
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 12/218:19 amONT - ORD
1 stop10h 20mFrontier
Sun 1/410:49 pmORD - ONT
1 stop20h 26mFrontier
Deal found 12/15$269
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.
Sun 12/288:19 amONT - ORD
1 stop10h 20mFrontier
Wed 12/319:34 pmORD - ONT
1 stop13h 19mFrontier
Deal found 12/16$283

Find 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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$158
(Kiwi.com)

One-way from

$69
(Trip.com)

Popular in

January

Cheapest in

April

Average price

$514

Good round-trip deal

$418 or less

Good one-way deal

$196 or less
Provider with most accurate pricing for Ontario-Chicago O'Hare Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Chicago O'Hare Intl flights.
Search Deals
From Ontario to Chicago O'Hare Intl
Search Deals
One-way flight from Ontario to Chicago O'Hare Intl
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 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 O'Hare Intl.
Search Deals
Price to beat on a one-way flight from Ontario to Chicago O'Hare Intl.
Search Deals

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 December 18, 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

Mon 4/6

6:00 am-12:12 am

1 stop16h 12m

Chicago O'Hare Intl

Mon 4/13

7:15 am-9:17 pm

1 stop16h 02m

$253

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sat 1/10

3:21 pm-7:54 pm

1 stop26h 33m

Chicago O'Hare Intl

Sun 1/11

10:07 pm-11:56 pm

1 stop27h 49m

$290

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 1/28

7:30 am-9:52 pm

2 stops12h 22m

Chicago O'Hare Intl

Sat 1/31

7:30 am-1:56 pm

1 stop8h 26m

$310

OntarioChicago

ONT - ORD

ONTORD

Ontario

Wed 1/28

5:59 pm-5:10 pm

2 stops21h 11m

Chicago O'Hare Intl

Sat 1/31

8:00 am-5:03 pm

2 stops11h 03m

$313

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sat 3/21

4:49 pm-6:08 am

1 stop11h 19m

Chicago O'Hare Intl

Wed 3/25

12:35 pm-9:03 pm

1 stop10h 28m

$317

OntarioChicago

ONT - ORD

ONTORD

Ontario

Tue 3/24

4:49 pm-6:08 am

1 stop11h 19m

Chicago O'Hare Intl

Fri 3/27

6:30 pm-12:01 am

1 stop7h 31m

$317

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

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 1/28

4:03 pm-5:10 pm

1 stop23h 07m

Chicago O'Hare Intl

Mon 2/2

8:00 am-3:08 pm

1 stop9h 08m

$324

OntarioChicago

ONT - ORD

ONTORD

Ontario

Sat 1/17

4:03 pm-2:38 pm

1 stop20h 35m

Chicago O'Hare Intl

Tue 1/20

8:00 am-8:36 pm

1 stop14h 36m

$324

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 23 results
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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 December.
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 December 12, 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 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 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 December 18, 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 48% 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 December 13, 2025.

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

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 December 18, 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
7.9
Good
4,250 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

7.9

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

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

7.9

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
8,005 reviews
Southwest
7.9
Good
4,250 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

7.9

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
9,091 reviews
Southwest
7.9
Good
4,250 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

7.9

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
11,054 reviews
Southwest
7.9
Good
4,250 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

7.9

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
3,081 reviews
Southwest
7.9
Good
4,250 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

7.9

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 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 12h 22m. Fly via Frontier, Delta, or Alaska Airlines to get the fastest option. There are 1695 mi between Ontario and Chicago O'Hare Intl Airport. This flight may include one or multiple stops.

  • 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 $102 on this airline. Additional options worth looking into are United Airlines and American Airlines, starting at $226 and $246 round-trip. Frontier is currently priced 73% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Ontario to Chicago O'Hare Intl Airport one-way?

    One-way options have recently been found by users for as low as $80 on Frontier. Other airlines that offer cheap prices include United Airlines from $113 and Alaska Airlines from $123 one-way.

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

    On average you can expect to pay $420 for a flight from Ontario to Chicago O'Hare Intl Airport. The cheapest flight overall is $159 while the most popular route, (Ontario - Chicago O'Hare Intl) is currently priced at $158.

  • 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 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 O'Hare Intl Airport?

Book flights to Chicago O'Hare Intl Airport if you plan to visit one of these locations
Schaumburg
Rosemont
Gurnee
Elgin
Naperville
Hoffman Estates
Beloit
Delavan
Oak Brook
Downers Grove
Des Plaines
Elk Grove Village
Skokie
Lake Geneva
Bridgeview
Warrenville
Waukegan
Aurora
Kenosha
Evanston

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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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$110Average$217FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$227Average$398FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$246Average$428FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$246Average$438FlexibilityNo cancel feeOn-time63%
DeltaCheapest$256Average$355FlexibilityNo cancel feeOn-timeN/A

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