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$78+ 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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ONT
Jun 13 — Jun 201
Fri 6/13
Fri 6/20
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 October, booked 42 days in advance, depart on a Tuesday or Monday and return on a Monday

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 June 8, 2025.

Round-trip from

$144
(Frontier)

One-way from

$78
(Frontier)

Popular in

December

Cheapest in

April

Average price

$330

Good round-trip deal

$227 or less

Good one-way deal

$126 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. 18% potential increase in price ($69 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 8, 2025.

This Frontier deal was found by Cheapflights users on 6/7. 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 8/99:55 amORD - ONT
1 stop11h 19mFrontier
Sat 8/168:09 pmONT - ORD
1 stop13h 28mFrontier
Deal found 6/7$144
This United Airlines deal was found by Cheapflights users on 6/5. 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.
Sat 8/307:59 pmORD - ONT
Nonstop4h 31mUnited Airlines
Sun 9/147:00 amONT - ORD
Nonstop4h 03mUnited Airlines
Deal found 6/5$201
This American Airlines deal was found by Cheapflights users on 6/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1912:36 pmORD - ONT
1 stop10h 34mAmerican Airlines
Sun 8/2410:29 pmONT - ORD
1 stop9h 20mAmerican Airlines
Deal found 6/6$221
This Alaska Airlines deal was found by Cheapflights users on 6/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/143:09 pmORD - ONT
1 stop11h 04mAlaska Airlines
Tue 8/267:22 pmONT - ORD
1 stop9h 41mAlaska Airlines
Deal found 6/6$223
This Delta deal was found by Cheapflights users on 6/6. 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.
Tue 8/196:00 amORD - ONT
2 stops8h 14mDelta
Thu 8/281:15 pmONT - ORD
1 stop6h 49mDelta
Deal found 6/6$262
This Kiwi.com deal was found by Cheapflights users on 6/7. 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 9/98:00 amORD - ONT
1 stop8h 09mHawaiian Airlines
Wed 9/2411:39 amONT - ORD
1 stop8h 25mHawaiian Airlines
Deal found 6/7$315

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 8, 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 8/9

9:55 am-7:14 pm

1 stop11h 19m

Ontario

Sat 8/16

8:09 pm-11:37 am

1 stop13h 28m

$144

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 8/30

7:59 pm-10:30 pm

Nonstop4h 31m

Ontario

Sun 9/14

7:00 am-1:03 pm

Nonstop4h 03m

$201

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 8/19

12:36 pm-9:10 pm

1 stop10h 34m

Ontario

Sun 8/24

10:29 pm-9:49 am

1 stop9h 20m

$221

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Thu 8/14

3:09 pm-12:13 am

1 stop11h 04m

Ontario

Tue 8/26

7:22 pm-7:03 am

1 stop9h 41m

$223

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 8/19

6:00 am-12:14 pm

2 stops8h 14m

Ontario

Thu 8/28

1:15 pm-10:04 pm

1 stop6h 49m

$262

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 9/9

8:00 am-2:09 pm

1 stop8h 09m

Ontario

Wed 9/24

11:39 am-10:04 pm

1 stop8h 25m

$315

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Sat 8/9

9:55 am-7:14 pm

1 stop11h 19m

$78

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 8/12

7:40 pm-10:11 pm

Nonstop4h 31m

$91

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Wed 7/9

7:08 am-6:27 pm

1 stop13h 19m

$100

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

Tue 8/5

6:20 pm-11:54 pm

1 stop7h 34m

$101

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/8

Showing 1-10 of 14 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 May 23, 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 42 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 $328). 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 8, 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 at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 23% 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

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.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

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).

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 8, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Chicago to Ontario to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,288 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,954 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,489 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,782 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • 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 $144 on this airline. Additional options worth looking into are United Airlines and American Airlines, starting at $201 and $221 round-trip. Frontier is 53% 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?

    $78 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 American Airlines, with prices starting from $91 and $101, respectively.

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

    On average you can expect to pay $238 for a flight from Chicago O'Hare Intl Airport to Ontario. The cheapest flight overall is $113 while the most popular route, (Chicago O'Hare Intl - Ontario) is currently priced at $201.

  • 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 $328). 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.

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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 June 8, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$122Average$184FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$231Average$380FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$237Average$399FlexibilityNo cancel feeOn-time69%
DeltaCheapest$246Average$378FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$246Average$467FlexibilityNo cancel feeOn-time63%

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