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$74+ 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
ago. 2 — ago. 91
sáb. 8/2
sáb. 8/9
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 42 days in advance, depart on a Wednesday or Tuesday 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 julio 28, 2025.

Round-trip from

$236
(Cheapflightsfares)

One-way from

$74
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$325

Good round-trip deal

$427 or less

Good one-way deal

$127 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. 14% potential increase in price ($56 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 July 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 julio 28, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 7/26. 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.
vie. 10/106:00 amORD - ONT
1 stop5h 51mFrontier
dom. 10/1212:40 pmONT - ORD
1 stop7h 45mFrontier
Deal found 7/26$236
This American Airlines deal was found by Cheapflights users on 7/27. 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.
mar. 9/307:34 amORD - ONT
1 stop12h 42mAmerican Airlines
mar. 10/71:00 pmONT - ORD
1 stop9h 30mAmerican Airlines
Deal found 7/27$283
This eDestinos deal was found by Cheapflights users on 7/26. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/98:00 amORD - ONT
2 stops27h 26mMultiple Airlines
mar. 9/168:59 pmONT - ORD
1 stop22h 29mMultiple Airlines
Deal found 7/26$309
This United Airlines deal was found by Cheapflights users on 7/26. 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.
mar. 8/197:59 pmORD - ONT
Nonstop4h 31mUnited Airlines
sáb. 8/237:00 amONT - ORD
Nonstop4h 03mUnited Airlines
Deal found 7/26$317
This Hawaiian Airlines deal was found by Cheapflights users on 7/28. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/146:00 amORD - ONT
1 stop8h 37mHawaiian Airlines
sáb. 10/251:31 pmONT - ORD
1 stop8h 35mHawaiian Airlines
Deal found 7/28$318
This Delta deal was found by Cheapflights users on 7/26. 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.
sáb. 8/165:45 amORD - ONT
1 stop6h 50mDelta
sáb. 8/237:05 amONT - ORD
1 stop7h 23mDelta
Deal found 7/26$319
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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.
sáb. 12/67:45 amORD - ONT
2 stops11h 08mAlaska Airlines
mar. 12/96:00 pmONT - ORD
1 stop9h 04mAlaska Airlines
Deal found 7/28$342

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 julio 28, 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

vie. 10/10

6:00 am-9:51 am

1 stop5h 51m

Ontario

dom. 10/12

12:40 pm-10:25 pm

1 stop7h 45m

$236

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

mar. 9/30

7:34 am-6:16 pm

1 stop12h 42m

Ontario

mar. 10/7

1:00 pm-12:30 am

1 stop9h 30m

$283

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

mar. 9/9

8:00 am-9:26 am

2 stops27h 26m

Ontario

mar. 9/16

8:59 pm-9:28 pm

1 stop22h 29m

$309

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

mar. 8/19

7:59 pm-10:30 pm

Nonstop4h 31m

Ontario

sáb. 8/23

7:00 am-1:03 pm

Nonstop4h 03m

$317

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

mar. 10/14

6:00 am-12:37 pm

1 stop8h 37m

Ontario

sáb. 10/25

1:31 pm-12:06 am

1 stop8h 35m

$318

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

sáb. 8/16

5:45 am-10:35 am

1 stop6h 50m

Ontario

sáb. 8/23

7:05 am-4:28 pm

1 stop7h 23m

$319

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

sáb. 12/6

7:45 am-4:53 pm

2 stops11h 08m

Ontario

mar. 12/9

6:00 pm-5:04 am

1 stop9h 04m

$342

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

mar. 8/19

6:00 am-4:18 pm

1 stop12h 18m

$74

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

mar. 9/23

7:20 am-7:54 pm

1 stop14h 34m

$76

ChicagoOntario

ORD - ONT

ORDONT

Chicago O'Hare Intl

mar. 10/28

8:00 am-3:17 pm

1 stop9h 17m

$144

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Showing 1-10 of 13 results
1
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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 July 25, 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 julio 28, 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 22% 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.

What’s the top layover airport for flights from Chicago O'Hare Intl Airport to Ontario?

Share of 1-stop round-trip flights from Chicago O'Hare Intl Airport to Ontario chosen by Cheapflights users in the past 12 months, using the same layover each way.

Denver (DEN) – chosen by Cheapflights users on 94% of 1-stop itineraries from Chicago O'Hare Intl Airport to Ontario on Cheapflights.

What’s the cheapest layover airport for flights from Chicago O'Hare Intl Airport to Ontario?

Average round-trip fare for 1-stop flights from Chicago O'Hare Intl Airport to Ontario, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $113.

What’s the fastest layover option from Chicago O'Hare Intl Airport to Ontario?

Shortest average travel time for 1-stop one-way flights from Chicago O'Hare Intl Airport to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Las Vegas (LAS) have the shortest average one-way travel time for 1-stop routes: 6h 34m.

Which airport typically offers the quickest layover for flights from Chicago O'Hare Intl Airport to Ontario?

Average layover duration for 1-stop one-way flights from Chicago O'Hare Intl Airport to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 5h 53m.

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 julio 28, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

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

Crew

8.5

Food

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

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
4,238 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

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
7,975 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

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
8,892 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Overall

8.0

Comfort

7.8

Entertainment

7.1

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 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.

  • 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 $236 on this airline. Additional options worth looking into are American Airlines and United Airlines, starting at $283 and $317 round-trip. Frontier is 27% 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?

    $76 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Alaska Airlines and American Airlines, with prices starting from $144 and $146, respectively.

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

    On average you can expect to pay $565 for a flight from Chicago O'Hare Intl Airport to Ontario. The cheapest flight overall is $102 while the most popular route, (Chicago O'Hare Intl - Ontario) is currently priced at $245.

  • 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 julio 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$121Average$168FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$231Average$406FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$237Average$416FlexibilityNo cancel feeOn-time69%
DeltaCheapest$246Average$280FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$246Average$495FlexibilityNo cancel feeOn-time63%

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