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$80+ 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 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ONT
Apr 21 — Apr 281
Tue 4/21
Tue 4/28
1 adult, Economy
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Find cheap flights from O'Hare Intl to Ontario with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Chicago O'Hare Intl to Ontario are usually found in April or May, booked 21 days in advance, depart on a Tuesday or Friday and return on a Thursday

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 March 22, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/235:20 am
ORD
-
ONT
2 stops20h 35m
Frontier
Mon 4/278:26 am
ONT
-
ORD
1 stop28h 51m
Frontier
Deal found 3/20$311
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/89:42 pm
ORD
-
ONT
1 stop14h 23m
Multiple Airlines
Sun 5/104:04 pm
ONT
-
ORD
2 stops12h 35m
Multiple Airlines
Deal found 3/19$313
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/64:21 pm
ORD
-
ONT
2 stops49h 36m
Frontier
Mon 4/139:02 pm
ONT
-
ORD
1 stop7h 18m
Frontier
Deal found 3/19$314
This CheapOair deal was found by Cheapflights users on 3/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/308:55 pm
ORD
-
ONT
1 stop18h 33m
Frontier
Sat 4/46:20 am
ONT
-
ORD
1 stop16h 18m
Frontier
Deal found 3/17$315
This CheapOair deal was found by Cheapflights users on 3/21. 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.
Fri 4/32:29 pm
ORD
-
ONT
1 stop11h 27m
Frontier
Sat 4/116:20 am
ONT
-
ORD
1 stop16h 18m
Frontier
Deal found 3/21$316
This United Airlines deal was found by Cheapflights users on 3/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/148:05 pm
ORD
-
ONT
Nonstop4h 26m
United Airlines
Fri 4/171:43 pm
ONT
-
ORD
1 stop5h 37m
United Airlines
Deal found 3/17$317
This Kiwi.com deal was found by Cheapflights users on 3/18. 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.
Tue 4/75:15 pm
ORD
-
ONT
1 stop25h 08m
Frontier
Thu 4/910:27 pm
ONT
-
ORD
2 stops24h 31m
Frontier
Deal found 3/18$320
This CheapOair deal was found by Cheapflights users on 3/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/28:30 am
ORD
-
ONT
1 stop12h 15m
Frontier
Sat 4/46:20 am
ONT
-
ORD
1 stop16h 18m
Frontier
Deal found 3/18$321
This Delta deal was found by Cheapflights users on 3/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/35:41 pm
ORD
-
ONT
2 stops7h 53m
Delta
Wed 6/109:55 am
ONT
-
ORD
1 stop6h 06m
Delta
Deal found 3/17$322
This Kiwi.com deal was found by Cheapflights users on 3/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1710:07 pm
ORD
-
ONT
1 stop14h 37m
Multiple Airlines
Thu 4/2312:59 am
ONT
-
ORD
2 stops20h 23m
Multiple Airlines
Deal found 3/19$323
This Frontier deal was found by Cheapflights users on 3/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/612:50 pm
ORD
-
ONT
1 stop9h 17m
Frontier
Tue 4/287:44 pm
ONT
-
ORD
1 stop8h 24m
Frontier
Deal found 3/18$325
This Frontier deal was found by Cheapflights users on 3/20. 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.
Fri 4/1012:50 pm
ORD
-
ONT
1 stop9h 17m
Frontier
Mon 4/139:02 pm
ONT
-
ORD
1 stop7h 18m
Frontier
Deal found 3/20$326

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 March 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$311
(Kiwi.com)

One-way from

$80
(Frontier)

Popular in

March

Cheapest in

April

Average price

$546

Good round-trip deal

$394 or less

Good one-way deal

$173 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.
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From Chicago O'Hare Intl to Ontario
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One-way flight from Chicago O'Hare Intl to Ontario
Search Deals
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 22, 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

Fri 4/10

8:05 pm-10:31 pm

Nonstop4h 26m

Ontario

Tue 4/14

1:34 pm-9:20 pm

1 stop5h 46m

$417

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 4/9

8:05 pm-10:31 pm

Nonstop4h 26m

Ontario

Fri 4/10

1:27 pm-12:59 am

1 stop9h 32m

$427

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 4/10

8:05 pm-10:31 pm

Nonstop4h 26m

Ontario

Thu 4/16

1:34 pm-11:28 pm

1 stop7h 54m

$427

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 7/20

6:59 pm-11:44 pm

1 stop6h 45m

Ontario

Fri 8/7

1:00 pm-9:58 pm

1 stop6h 58m

$507

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 5/8

7:45 pm-11:34 pm

1 stop5h 49m

Ontario

Wed 5/13

1:35 pm-11:57 pm

1 stop8h 22m

$516

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 9/17

3:09 pm-10:39 pm

1 stop9h 30m

Ontario

Thu 9/24

6:00 am-5:01 pm

1 stop9h 01m

$525
Quickest round-trip

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 5/23

8:13 pm-10:46 pm

Nonstop4h 33m

Ontario

Tue 5/26

6:30 am-12:45 pm

Nonstop4h 15m

$531

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 5/14

8:09 pm-10:35 pm

Nonstop4h 26m

Ontario

Fri 5/15

6:59 pm-6:20 am

1 stop9h 21m

$541

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sun 4/26

4:15 pm-12:05 am

2 stops9h 50m

Ontario

Thu 4/30

1:55 pm-11:55 pm

2 stops8h 00m

$562

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 5/20

8:09 pm-10:35 pm

Nonstop4h 26m

Ontario

Thu 5/21

6:39 pm-5:57 am

1 stop9h 18m

$574

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/17

Showing 1-10 of 22 resultsSorted by cheapest first
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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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice 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 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, April is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $67). Flying from Chicago O'Hare Intl Airport to Ontario in March is currently the most expensive (average of $166). 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 March 22, 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.

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 March 22, 2026.
See what other customers who have flown with Southwest,Delta, andUnited 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.
Southwest
8.0
Very good
4,324 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,324 reviews
Southwest
8.0
Very good
4,324 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,314 reviews
Southwest
8.0
Very good
4,324 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,455 reviews
Southwest
8.0
Very good
4,324 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,488 reviews
Southwest
8.0
Very good
4,324 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.7
Fair
3,018 reviews
Southwest
8.0
Very good
4,324 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 5 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 and Delta fly from Chicago O'Hare Intl Airport to Ontario in about 4h 26m. The time it takes to get you to your destination can typically vary by up to 2h 19m. The distance from Chicago O'Hare Intl Airport to Ontario is about 1695 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $127 on this airline. Additional options worth looking into are American Airlines and Southwest, starting at $246 and $246 round-trip. Frontier is 68% 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 United Airlines, with prices starting from $110 and $113, respectively.

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

    On average you can expect to pay $371 for a flight from Chicago O'Hare Intl Airport to Ontario. The cheapest flight overall is $170 while the most popular route, (Chicago O'Hare Intl - Ontario) is currently priced at $183.

  • 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, April is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $67). Flying from Chicago O'Hare Intl Airport to Ontario in March is currently the most expensive (average of $166). 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 5 airlines flying from O'Hare Intl to Ontario

Discover the top 5 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 March 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$127Average$259FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$246Average$515FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$246Average$524FlexibilityNo cancel feeOn-time71%
DeltaCheapest$256Average$359FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$263Average$453FlexibilityNo cancel feeOn-time69%

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