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

Airlines like Alaska Airlines fly from Chicago O'Hare Intl Airport to Ontario in about 23h 02m. 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 $125 on this airline. Additional options worth looking into are American Airlines and United Airlines, starting at $231 and $237 round-trip. Frontier is 65% 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?

$80 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and Southwest, with prices starting from $113 and $123, respectively.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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

On average you can expect to pay $456 for a flight from Chicago O'Hare Intl Airport to Ontario. The cheapest flight overall is $255 while the most popular route, (Chicago O'Hare Intl - Ontario) is currently priced at $157.

What are the most popular airlines that fly from Chicago O'Hare Intl Airport to Ontario?

Before booking your flight from Chicago O'Hare Intl Airport to Ontario check out the most popular airlines for this route: United Airlines, American Airlines or Frontier.

Most accurate provider : When it comes to deals on Chicago O'Hare Intl Airport-Ontario flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Chicago O'Hare Intl Airport-Ontario flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.

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.

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.

$62+ Flights from Chicago O'Hare Intl Airport to Ontario

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Cheapflights Tip: The best prices from Chicago O'Hare Intl to Ontario are usually found in April or February, booked 9 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 December 23, 2025.

Wed 12/319:34 pmORD - ONT

1 stop13h 19mFrontier

Wed 1/146:49 pmONT - ORD

1 stop24h 22mFrontier

Deal found 12/21

$234

Wed 12/319:34 pmORD - ONT

1 stop13h 19mFrontier

Thu 1/86:00 amONT - ORD

1 stop10h 45mFrontier

Deal found 12/21

$284

Wed 12/317:00 amORD - ONT

1 stop18h 59mFrontier

Sat 1/36:45 amONT - ORD

1 stop15h 27mFrontier

Deal found 12/22

$312

Thu 12/257:00 amORD - ONT

1 stop18h 59mFrontier

Thu 1/810:18 pmONT - ORD

1 stop21h 14mFrontier

Deal found 12/20

$363

Wed 12/317:00 amORD - ONT

1 stop18h 59mFrontier

Fri 1/26:45 amONT - ORD

1 stop15h 27mFrontier

Deal found 12/22

$413

Sun 12/219:34 pmORD - ONT

1 stop11h 50mFrontier

Sun 12/286:00 amONT - ORD

1 stop13h 39mFrontier

Deal found 12/20

$438

Fri 12/267:00 amORD - ONT

1 stop18h 59mFrontier

Mon 12/296:20 pmONT - ORD

1 stop27h 21mFrontier

Deal found 12/22

$442

Fri 12/267:00 amORD - ONT

1 stop18h 59mFrontier

Sat 12/276:45 amONT - ORD

1 stop15h 27mFrontier

Deal found 12/22

$472

Best flights from O'Hare Intl to Ontario
Discover carefully curated flight deals from O'Hare Intl to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 23, 2025.

Fri 1/236:06 pmORD - ONT

1 stop23h 02mAlaska Airlines

Mon 1/266:00 amONT - ORD

1 stop15h 50mAlaska Airlines

Deal found 12/21

$284

Sat 1/175:20 pmORD - ONT

1 stop6h 28mDelta

Sat 1/2412:41 pmONT - ORD

1 stop9h 15mDelta

Deal found 12/21

$356

Wed 1/288:00 amORD - ONT

1 stop14h 36mAlaska Airlines

Thu 1/296:00 amONT - ORD

1 stop15h 50mAlaska Airlines

Deal found 12/22

$284

Tue 1/276:06 pmORD - ONT

1 stop28h 30mAlaska Airlines

Thu 1/296:00 amONT - ORD

1 stop15h 50mAlaska Airlines

Deal found 12/22

$284

Wed 2/257:00 amORD - ONT

1 stop17h 44mAlaska Airlines

Mon 3/27:37 pmONT - ORD

2 stops18h 56mAlaska Airlines

Deal found 12/21

$300

Sun 1/111:50 pmORD - ONT

2 stops11h 01mDelta

Sun 1/1812:41 pmONT - ORD

1 stop9h 18mDelta

Deal found 12/21

$365

Wed 1/147:20 amORD - ONT

1 stop6h 56mDelta

Fri 1/161:11 pmONT - ORD

1 stop6h 41mDelta

Deal found 12/20

$365

Fri 2/66:06 pmORD - ONT

1 stop28h 30mAlaska Airlines

Fri 2/134:02 pmONT - ORD

1 stop29h 54mAlaska Airlines

Deal found 12/22

$314

Wed 2/46:06 pmORD - ONT

1 stop23h 02mAlaska Airlines

Mon 2/94:03 pmONT - ORD

1 stop20h 35mAlaska Airlines

Deal found 12/21

$314

Sun 2/83:35 pmORD - ONT

1 stop21h 24mAlaska Airlines

Sun 2/156:14 amONT - ORD

1 stop15h 42mAlaska Airlines

Deal found 12/22

$329

Fri 1/233:35 pmORD - ONT

1 stop10h 21mAlaska Airlines

Sun 1/256:00 amONT - ORD

1 stop9h 10mAlaska Airlines

Deal found 12/22

$339

Tue 3/37:00 amORD - ONT

1 stop17h 44mAlaska Airlines

Tue 5/53:26 pmONT - ORD

1 stop13h 14mAlaska Airlines

Deal found 12/21

$386

Last-minute flights from O'Hare Intl to Ontario
Discover last-minute flight deals from O'Hare Intl to Ontario. Data last updated December 23, 2025 and is based on user searches.

Wed 1/74:49 pmORD - ONT

2 stops22h 50mFrontier

Mon 1/126:00 amONT - ORD

1 stop10h 45mFrontier

Deal found 12/22

$227

Thu 1/810:32 pmORD - ONT

1 stop11h 04mFrontier

Mon 1/126:00 amONT - ORD

1 stop10h 45mFrontier

Deal found 12/22

$182

Thu 1/810:32 pmORD - ONT

1 stop11h 04mFrontier

Sun 1/116:00 amONT - ORD

1 stop12h 57mFrontier

Deal found 12/22

$217

Mon 1/1210:37 pmORD - ONT

1 stop21h 17mMultiple Airlines

Tue 1/203:07 pmONT - ORD

2 stops29h 31mMultiple Airlines

Deal found 12/22

$186

Thu 1/1510:41 pmORD - ONT

1 stop21h 03mFrontier

Thu 1/226:20 amONT - ORD

1 stop26h 37mFrontier

Deal found 12/21

$203

Thu 1/227:41 pmORD - ONT

1 stop6h 39mFrontier

Sat 1/247:15 amONT - ORD

1 stop25h 42mFrontier

Deal found 12/21

$183

Thu 1/228:00 amORD - ONT

2 stops13h 53mMultiple Airlines

Mon 1/261:46 pmONT - ORD

1 stop30h 52mMultiple Airlines

Deal found 12/22

$228

Thu 1/297:41 pmORD - ONT

1 stop6h 39mFrontier

Thu 2/58:48 pmONT - ORD

1 stop21h 41mFrontier

Deal found 12/21

$204

Fri 1/309:38 pmORD - ONT

1 stop17h 56mFrontier

Wed 2/43:07 pmONT - ORD

2 stops24h 49mFrontier

Deal found 12/21

$192

Sat 1/318:00 amORD - ONT

2 stops12h 40mMultiple Airlines

Mon 2/21:46 pmONT - ORD

1 stop22h 31mMultiple Airlines

Deal found 12/21

$205

One-way flights from O'Hare Intl to Ontario
Search for one-way flight options from O'Hare Intl to Ontario. Find affordable one-way fares based on user searches. Data last updated December 23, 2025.

Mon 1/1210:37 pmORD - ONT

1 stop21h 17mFrontier

Deal found 12/22

$62

Sun 1/259:38 pmORD - ONT

1 stop23h 32mFrontier

Deal found 12/22

$64

Mon 1/199:59 pmORD - ONT

1 stop17h 38mFrontier

Deal found 12/22

$67

Sun 1/1810:41 pmORD - ONT

1 stop10h 56mFrontier

Deal found 12/21

$73

Thu 2/266:34 pmORD - ONT

1 stop20h 52mFrontier

Deal found 12/21

$83

Sun 2/89:38 pmORD - ONT

1 stop16h 32mFrontier

Deal found 12/21

$90

Thu 1/87:50 pmORD - ONT

1 stop6h 06mFrontier

Deal found 12/22

$91

Thu 1/227:41 pmORD - ONT

1 stop6h 39mFrontier

Deal found 12/22

$92

Sun 3/14:16 pmORD - ONT

1 stop9h 43mFrontier

Deal found 12/22

$93

Mon 4/137:15 amORD - ONT

1 stop11h 43mFrontier

Deal found 12/22

$94

Sat 4/117:15 amORD - ONT

1 stop10h 31mFrontier

Deal found 12/22

$96

Find flight deals from O'Hare Intl to Ontario

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$165 (Frontier)
One-way from	$62 (Trip.com)
Popular in	September
Cheapest in	April
Average price	$518
Good round-trip deal	$550 or less
Good one-way deal	$266 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. 16% potential increase in price ($74 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($14 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 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

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

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 1/23

6:06 pm-3:08 pm

1 stop23h 02m

Ontario

Mon 1/26

6:00 am-11:50 pm

1 stop15h 50m

$284

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 1/28

8:00 am-8:36 pm

1 stop14h 36m

Ontario

Thu 1/29

6:00 am-11:50 pm

1 stop15h 50m

$284

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 1/27

6:06 pm-8:36 pm

1 stop28h 30m

Ontario

Thu 1/29

6:00 am-11:50 pm

1 stop15h 50m

$284

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 2/25

7:00 am-10:44 pm

1 stop17h 44m

Ontario

Mon 3/2

7:37 pm-4:33 pm

2 stops18h 56m

$300

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 2/6

6:06 pm-8:36 pm

1 stop28h 30m

Ontario

Fri 2/13

4:02 pm-11:56 pm

1 stop29h 54m

$314

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 2/4

6:06 pm-3:08 pm

1 stop23h 02m

Ontario

Mon 2/9

4:03 pm-2:38 pm

1 stop20h 35m

$314

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sun 2/8

3:35 pm-10:59 am

1 stop21h 24m

Ontario

Sun 2/15

6:14 am-11:56 pm

1 stop15h 42m

$329

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Fri 1/23

3:35 pm-11:56 pm

1 stop10h 21m

Ontario

Sun 1/25

6:00 am-5:10 pm

1 stop9h 10m

$339

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 1/17

5:20 pm-9:48 pm

1 stop6h 28m

Ontario

Sat 1/24

12:41 pm-11:56 pm

1 stop9h 15m

$356

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sun 1/11

1:50 pm-10:51 pm

2 stops11h 01m

Ontario

Sun 1/18

12:41 pm-11:59 pm

1 stop9h 18m

$365

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 22 results

Compare providers for flights from O'Hare Intl to Ontario

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 December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
CheapOair	Price Accuracy3 stars	Trust Score*3 stars
Cheapfaremart	Price 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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Chicago O'Hare Intl Airport-Ontario flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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

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

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 9 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, September is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $80). Flying from Chicago O'Hare Intl Airport to Ontario in January is currently the most expensive (average of $124). 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?

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 morning could potentially save you up to 39% on airfare.

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

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. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ontario

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

4,253 reviews

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

4,253 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Delta

7.9

Good

8,014 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

United Airlines

7.4

Good

9,105 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

American Airlines

7.2

Good

11,054 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Frontier

5.8

Fair

3,075 reviews

Southwest

8.0

Very good

4,253 reviews

Reviews

1 / 20

8.0

Excellent

Walter,Aug 2025

OAK - SAN

Related info for your journey

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 Alaska Airlines fly from Chicago O'Hare Intl Airport to Ontario in about 23h 02m. 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 $125 on this airline. Additional options worth looking into are American Airlines and United Airlines, starting at $231 and $237 round-trip. Frontier is 65% 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?
$80 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and Southwest, with prices starting from $113 and $123, respectively.
What are the cheapest flights from Chicago O'Hare Intl Airport to Ontario?
On average you can expect to pay $456 for a flight from Chicago O'Hare Intl Airport to Ontario. The cheapest flight overall is $255 while the most popular route, (Chicago O'Hare Intl - Ontario) is currently priced at $157.
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, September is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Ontario (average of $80). Flying from Chicago O'Hare Intl Airport to Ontario in January is currently the most expensive (average of $124). 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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Other flights to Ontario

Top 5 airlines flying from O'Hare Intl to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$125	Average$219	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$231	Average$459	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$237	Average$435	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$246	Average$420	FlexibilityNo cancel fee	On-time63%
Delta	Cheapest$256	Average$256	FlexibilityNo cancel fee	On-timeN/A

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$62+ 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 1/12. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from O'Hare Intl to Ontario with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

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Cheapflights Tip: The best prices from Chicago O'Hare Intl to Ontario are usually found in April or February, booked 9 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 OntarioExplore 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 December 23, 2025.

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 December 23, 2025.

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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.

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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.

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?

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Reviews of airlines servicing Ontario

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.

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?

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

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

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

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

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

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

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

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

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Alternative routes for O'Hare Intl to Ontario

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Top 5 airlines flying from O'Hare Intl to Ontario

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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 December 23, 2025.