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$106+ Cheap flights from O'Hare Intl (ORD) to Ontario (ONT)

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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ONT
Jul 21 — Jul 281
Tue 7/21
Tue 7/28
1 adult, Economy
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Cheap flight deals from O'Hare Intl to Ontario

Cheapest flights from O'Hare Intl to Ontario
Explore the most affordable flight options available from O'Hare Intl to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 21, 2026.

This Kiwi.com deal was found by Cheapflights users on 6/18. 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.
Wed 8/192:41 pm
ORD
-
ONT
1 stop11h 14m
Frontier
Tue 8/257:56 pm
ONT
-
ORD
1 stop15h 40m
Frontier
Deal found 6/18$222
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/188:06 pm
ORD
-
ONT
Nonstop4h 29m
United Airlines
Wed 8/267:00 am
ONT
-
ORD
Nonstop4h 10m
United Airlines
Deal found 6/16$239
This Frontier deal was found by Cheapflights users on 6/19. 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.
Wed 7/227:15 am
ORD
-
ONT
1 stop9h 59m
Frontier
Sat 7/253:40 pm
ONT
-
ORD
1 stop11h 57m
Frontier
Deal found 6/19$240
This Frontier deal was found by Cheapflights users on 6/20. 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.
Sat 7/257:15 am
ORD
-
ONT
1 stop9h 59m
Frontier
Sat 8/16:00 am
ONT
-
ORD
1 stop12h 52m
Frontier
Deal found 6/20$241
This Booking.com deal was found by Cheapflights users on 6/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/149:57 pm
ORD
-
ONT
1 stop14h 07m
Frontier
Tue 7/281:38 pm
ONT
-
ORD
1 stop13h 59m
Frontier
Deal found 6/17$242
This Super.com deal was found by Cheapflights users on 6/19. 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.
Wed 8/199:10 am
ORD
-
ONT
1 stop11h 51m
Frontier
Sat 8/227:56 pm
ONT
-
ORD
1 stop15h 40m
Frontier
Deal found 6/19$247
This Booking.com deal was found by Cheapflights users on 6/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/299:57 pm
ORD
-
ONT
1 stop27h 53m
Frontier
Tue 8/48:17 am
ONT
-
ORD
1 stop9h 58m
Frontier
Deal found 6/20$248
This Expedia deal was found by Cheapflights users on 6/20. 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.
Tue 8/47:15 am
ORD
-
ONT
1 stop9h 59m
Frontier
Thu 8/610:49 am
ONT
-
ORD
1 stop8h 03m
Frontier
Deal found 6/20$250
This Booking.com deal was found by Cheapflights users on 6/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/117:15 am
ORD
-
ONT
1 stop9h 59m
Frontier
Sat 8/159:36 am
ONT
-
ORD
1 stop12h 57m
Frontier
Deal found 6/16$251
This Booking.com deal was found by Cheapflights users on 6/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:15 am
ORD
-
ONT
1 stop9h 59m
Frontier
Wed 8/193:40 pm
ONT
-
ORD
1 stop25h 22m
Frontier
Deal found 6/18$252
This Booking.com deal was found by Cheapflights users on 6/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/219:57 pm
ORD
-
ONT
1 stop14h 07m
Frontier
Wed 7/221:38 pm
ONT
-
ORD
1 stop13h 59m
Frontier
Deal found 6/18$253

Find flight deals from O'Hare Intl to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from O'Hare Intl (ORD) to Ontario (ONT). 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 June 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$222
(Kiwi.com)

One-way from

$106
(Trip.com)

Popular in

December

Cheapest in

February

Average price

$447

Good round-trip deal

$364 or less

Good one-way deal

$203 or less
Provider with most accurate pricing for Chicago O'Hare Intl-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago O'Hare Intl-Ontario flights.
Search Deals
From Chicago O'Hare Intl to Ontario
Search Deals
One-way flight from Chicago O'Hare Intl to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals
Price to beat on a round-trip flight from Chicago O'Hare Intl to Ontario.
Search Deals
Price to beat on a one-way flight from Chicago O'Hare Intl to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from O'Hare Intl to Ontario 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 June 21, 2026.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 9/1

10:35 am-6:11 pm

1 stop9h 36m

Ontario

Wed 9/9

7:00 am-1:10 pm

Nonstop4h 10m

$349
Quickest round-trip

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 8/15

8:06 pm-10:35 pm

Nonstop4h 29m

Ontario

Wed 8/19

7:00 am-1:10 pm

Nonstop4h 10m

$368

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 8/12

8:06 pm-10:35 pm

Nonstop4h 29m

Ontario

Sat 8/22

1:18 pm-9:30 pm

1 stop6h 12m

$378

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 8/8

8:18 pm-10:51 pm

Nonstop4h 33m

Ontario

Mon 8/10

1:50 pm-12:59 am

1 stop9h 09m

$403

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 8/18

8:06 pm-10:35 pm

Nonstop4h 29m

Ontario

Wed 8/19

7:00 am-1:10 pm

Nonstop4h 10m

$423

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 7/28

8:18 pm-10:51 pm

Nonstop4h 33m

Ontario

Tue 8/4

6:10 am-12:25 pm

Nonstop4h 15m

$423

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 7/27

8:18 pm-10:51 pm

Nonstop4h 33m

Ontario

Wed 7/29

5:45 am-4:39 pm

1 stop8h 54m

$469

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sun 7/12

8:18 pm-10:51 pm

Nonstop4h 33m

Ontario

Tue 7/14

1:18 pm-10:49 pm

1 stop7h 31m

$498

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 7/23

6:10 am-12:12 pm

1 stop8h 02m

Ontario

Wed 7/29

6:10 am-12:25 pm

Nonstop4h 15m

$537

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 7/25

8:18 pm-10:51 pm

Nonstop4h 33m

Ontario

Mon 7/27

6:10 am-12:25 pm

Nonstop4h 15m

$547

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/18

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

Compare providers for flights from O'Hare Intl to Ontario

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 O'Hare Intl to Ontario in June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust 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 Chicago O'Hare Intl Airport-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Chicago O'Hare Intl Airport-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Chicago O'Hare Intl Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago O'Hare Intl Airport-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub 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 Chicago O'Hare Intl Airport-Ontario 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 O'Hare Intl to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from O'Hare Intl 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 Chicago O'Hare Intl Airport to Ontario

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

Currently, February is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $385). Flying from Chicago O'Hare Intl Airport to Ontario in December is currently the most expensive (average of $576). 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 ORD to ONT?

Find hourly flight availability from O'Hare Intl to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 21, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Chicago O'Hare Intl Airport to Ontario as you normally would.

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

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated June 21, 2026.
See what other customers who have flown with Delta,United Airlines, andAmerican Airlines from Chicago O'Hare Intl Airport to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,422 reviews

Comfort

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
7.8
Good
8,422 reviews
Delta
7.8
Good
8,422 reviews

Comfort

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
9,871 reviews
Delta
7.8
Good
8,422 reviews

Comfort

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.1
Good
11,733 reviews
Delta
7.8
Good
8,422 reviews

Comfort

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Frontier
5.6
Fair
2,876 reviews
Delta
7.8
Good
8,422 reviews

Comfort

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Entertainment

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from O'Hare Intl to Ontario. 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 into for flights to Ontario from Chicago O'Hare Intl?

    Ontario (ONT) is the airport you will fly into if you book a flight from Chicago O'Hare Intl to Ontario. You should not have trouble finding flights to Ontario from Chicago O'Hare Intl; the airport handles an average of 0 inbound flights from Chicago O'Hare Intl per day. You should also have plenty of airline options to choose from since 4 airlines have flights to the Ontario airport from Chicago O'Hare Intl. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

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

    Airlines like United Airlines fly from Chicago O'Hare Intl Airport to Ontario in about 9h 36m. The time it takes to get you to your destination can typically vary by up to . The distance from Chicago O'Hare Intl Airport to Ontario is about 1695 mi.

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

    Our cheapest airline available from Chicago O'Hare Intl Airport to Ontario is Frontier. Our recent data shows that you can find tickets from as low as $153 on this airline. Additional options worth looking into are Delta and American Airlines, starting at $248 and $307 round-trip. Frontier is 67% cheaper than the average price of flights available within the next 90 days to this destination.

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

    $86 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and American Airlines, with prices starting from $109 and $119, respectively.

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

    On average you can expect to pay $330 for a flight from Chicago O'Hare Intl Airport to Ontario. The cheapest flight overall is $163 while the most popular route, (Chicago O'Hare Intl - Ontario) is currently priced at $238.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from O'Hare Intl to Ontario 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 Chicago O'Hare Intl Airport to Ontario?

    Currently, February is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $385). Flying from Chicago O'Hare Intl Airport to Ontario in December is currently the most expensive (average of $576). 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

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Top 4 airlines flying from O'Hare Intl to Ontario

Discover the top 4 airlines that operate flights from O'Hare Intl to Ontario. 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 June 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$127Average$259FlexibilityNo cancel feeOn-time62%
DeltaCheapest$248Average$385FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$307Average$524FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$329Average$530FlexibilityNo cancel feeOn-time69%

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