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$79+ 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 11/16. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ONT
Oct 19 — Oct 261
Sun 10/19
Sun 10/26
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago O'Hare Intl to Ontario are usually found in April or February, booked 23 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap 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 September 19, 2025.

Round-trip from

$143
(Kiwi.com)

One-way from

$79
(Cheapflightsfares)

Popular in

December

Cheapest in

April

Average price

$437

Good round-trip deal

$329 or less

Good one-way deal

$182 or less
From Chicago O'Hare Intl to Ontario
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One-way flight from Chicago O'Hare Intl to Ontario
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Highest demand for flights based on searches. 13% potential increase in price ($54 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Chicago O'Hare Intl to Ontario.
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Price to beat on a one-way flight from Chicago O'Hare Intl to Ontario.
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Find 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 September 19, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/18. 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 11/186:05 pmORD - ONT
1 stop29h 22mFrontier
Thu 12/44:02 pmONT - ORD
1 stop24h 32mFrontier
Deal found 9/18$143
This CheapOair deal was found by Cheapflights users on 9/16. 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 10/166:50 amORD - ONT
1 stop28h 45mFrontier
Tue 10/217:04 amONT - ORD
1 stop14h 49mFrontier
Deal found 9/16$148
This Gotogate deal was found by Cheapflights users on 9/17. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/310:42 amORD - ONT
1 stop11h 12mFrontier
Sat 10/117:04 amONT - ORD
1 stop14h 49mFrontier
Deal found 9/17$149
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 11/186:05 pmORD - ONT
1 stop29h 22mMultiple Airlines
Wed 12/36:30 amONT - ORD
1 stop21h 55mMultiple Airlines
Deal found 9/18$151
This Mytrip deal was found by Cheapflights users on 9/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/231:14 pmORD - ONT
1 stop29h 14mFrontier
Mon 10/276:53 amONT - ORD
1 stop16h 06mFrontier
Deal found 9/17$153
This Booking.com deal was found by Cheapflights users on 9/17. 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.
Thu 9/254:03 pmORD - ONT
1 stop28h 32mFrontier
Wed 10/18:59 pmONT - ORD
1 stop10h 38mFrontier
Deal found 9/17$154
This Booking.com deal was found by Cheapflights users on 9/18. 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 10/117:05 amORD - ONT
1 stop18h 45mFrontier
Sun 10/1212:49 pmONT - ORD
1 stop9h 37mFrontier
Deal found 9/18$155
This Cheapflightsfares deal was found by Cheapflights users on 9/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/61:36 pmORD - ONT
1 stop7h 13mFrontier
Mon 11/101:46 pmONT - ORD
1 stop7h 55mFrontier
Deal found 9/18$157
This Frontier deal was found by Cheapflights users on 9/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/310:42 amORD - ONT
1 stop11h 12mFrontier
Sun 10/58:59 pmONT - ORD
1 stop10h 38mFrontier
Deal found 9/17$158
This Booking.com deal was found by Cheapflights users on 9/17. 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.
Thu 9/254:03 pmORD - ONT
1 stop28h 32mFrontier
Tue 9/308:59 pmONT - ORD
1 stop22h 29mFrontier
Deal found 9/17$160
This Booking.com deal was found by Cheapflights users on 9/17. 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.
Fri 11/710:43 pmORD - ONT
1 stop15h 54mFrontier
Tue 11/118:45 amONT - ORD
1 stop28h 54mFrontier
Deal found 9/17$165

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 September 19, 2025.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Ontario that are best for you.

Fly from

O'Hare Intl

Fly to

Ontario

Route

Depart

Return

Price

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 11/1

7:15 am-11:50 pm

1 stop18h 35m

Ontario

Tue 11/4

8:45 am-3:39 pm

1 stop28h 54m

$149

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 10/15

6:00 am-12:37 pm

1 stop8h 37m

Ontario

Sat 10/18

1:31 pm-11:59 pm

1 stop8h 28m

$358

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 11/4

8:00 am-3:17 pm

1 stop9h 17m

Ontario

Wed 11/5

6:03 pm-5:01 am

1 stop8h 58m

$359

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 2/24

10:00 am-6:17 pm

1 stop10h 17m

Ontario

Thu 2/26

6:00 am-5:50 pm

1 stop9h 50m

$387

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 11/15

6:00 am-4:09 pm

2 stops12h 09m

Ontario

Tue 11/18

10:25 pm-7:23 pm

2 stops18h 58m

$391

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 10/23

7:59 pm-10:30 pm

Nonstop4h 31m

Ontario

Mon 10/27

1:29 pm-11:59 pm

1 stop8h 30m

$407

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 10/10

7:59 pm-10:30 pm

Nonstop4h 31m

Ontario

Mon 10/13

7:02 am-1:05 pm

Nonstop4h 03m

$407

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 10/16

7:00 am-12:03 am

2 stops19h 03m

Ontario

Tue 10/21

6:00 am-5:03 pm

1 stop9h 03m

$416

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Mon 11/17

3:25 pm-11:32 pm

1 stop10h 07m

Ontario

Fri 11/21

7:21 pm-6:28 am

1 stop9h 07m

$416

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 11/20

8:00 am-3:17 pm

1 stop9h 17m

Ontario

Mon 11/24

6:11 pm-5:01 am

1 stop8h 50m

$416

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 22 results
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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

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

Use this chart to determine the optimal time to book a round-trip flight from O'Hare Intl to Ontario. Price data was last updated on September 12, 2025.

The price you pay for your flight from Chicago O'Hare Intl Airport to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 23 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 Chicago O'Hare Intl Airport to Ontario?

Currently, August is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $246). Flying from Chicago O'Hare Intl Airport to Ontario in March is currently the most expensive (average of $327). 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 September 19, 2025.

One of the essential ways to save on airfare from Chicago O'Hare Intl Airport to Ontario is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 24% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from O'Hare Intl to Ontario. Price data was last updated on December 16, 2024.

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

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 September 19, 2025.
See what other customers who have flown with Southwest, Delta, and United 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
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

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
8.0
Very good
7,965 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

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
8,925 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

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
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

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
3,172 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

8.0

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 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 1 inbound flight 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 Frontier, Hawaiian Airlines, and Alaska Airlines fly from Chicago O'Hare Intl Airport to Ontario in about 8h 37m. The time it takes to get you to your destination can typically vary by up to 9h 58m. 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 $124 on this airline. Additional options worth looking into are American Airlines and United Airlines, starting at $231 and $237 round-trip. Frontier is 63% 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?

    $158 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Alaska Airlines and Hawaiian Airlines, with prices starting from $179 and $179, respectively.

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

    On average you can expect to pay $343 for a flight from Chicago O'Hare Intl Airport to Ontario. The cheapest flight overall is $148 while the most popular route, (Chicago O'Hare Intl - Ontario) is currently priced at $148.

  • 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, August is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $246). Flying from Chicago O'Hare Intl Airport to Ontario in March is currently the most expensive (average of $327). 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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Alternative routes for O'Hare Intl to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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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 September 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$124Average$195FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$231Average$430FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$237Average$427FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$246Average$477FlexibilityNo cancel feeOn-time63%
DeltaCheapest$256Average$256FlexibilityNo cancel feeOn-timeN/A

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