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Cheap flights from Ontario (ONT) to Chicago (CHI) from $70

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 6/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — CHI
Jun 4 — Jun 111
From?
To?
Tue 6/4
Tue 6/11
1 adult, Economy
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The best prices from Ontario to Chicago are usually found in November or October, booked 25 days in advance, depart on a Tuesday or Thursday and return on a Thursday

Cheap flight deals from Ontario to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Chicago (CHI). 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 May 30, 2024.

Popular in

July

Cheapest in

November

Round-trip from

$222

One-way from

$95
High demand for flights, 17% potential price rise
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Best time to find cheap flights, 18% potential price drop
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From Ontario to Chicago (CHI)
Search Deals
One-way flight from Ontario to Chicago (CHI)
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What is the cheapest day to fly round-trip from Ontario to Chicago?

Departing on a Monday is a good option for securing a great price. You can expect to save up to 21% when planning your travel around this day of the week.

How far in advance should I book a flight from Ontario to Chicago?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 60 days in advance, which can save you up to 71% on flights from Ontario to Chicago compared to booking the week you need them. Waiting 60 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $319. For sooner than that we have options available in the next 3 days from $507.

What is the cheapest month to fly from Ontario to Chicago?

Due to multiple factors, expect to potentially pay more when booking in March. For low rates, January can be a great choice for travel to Chicago. Flights to Chicago from Ontario in January are about $313 on average during January, but can be found for as low as $135.

When is the cheapest time to fly from Ontario to Chicago (ONT - CHI)?

Unlike at noon, when flights are generally more expensive, you can save up to 17% on flights from Ontario to Chicago by exploring options for tickets in the afternoon.

Cheap Frontier flights from Ontario to Chicago

Explore cheap flight options specifically provided by Frontier for the route between Ontario and Chicago. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 30, 2024.
Peruse some of the lowest-priced Frontier flights we've found from Ontario to Chicago. Make sure to check back often as deals are often changing.
Mon 9/912:49 amONT - ORD
1 stop17h 32mFrontier
Tue 9/247:30 pmORD - ONT
1 stop19h 52mFrontier
Deal found 5/29$136
Mon 6/1012:55 pmONT - ORD
1 stop14h 30mFrontier
Thu 6/138:23 pmORD - ONT
1 stop18h 56mFrontier
Deal found 5/29$138
Tue 8/2012:49 amONT - ORD
1 stop22h 14mFrontier
Mon 8/267:30 pmORD - ONT
1 stop24h 39mFrontier
Deal found 5/29$139
Mon 6/105:41 pmONT - ORD
1 stop9h 44mFrontier
Sat 6/158:35 pmORD - ONT
1 stop12h 28mFrontier
Deal found 5/29$140
Mon 6/1012:55 pmONT - ORD
1 stop14h 30mFrontier
Sat 6/158:35 pmORD - ONT
1 stop12h 28mFrontier
Deal found 5/30$141
Mon 6/1012:55 pmONT - ORD
1 stop14h 30mFrontier
Thu 6/138:23 pmORD - ONT
1 stop23h 05mFrontier
Deal found 5/29$142
Fri 6/712:48 amONT - MDW
1 stop18h 42mFrontier
Wed 6/125:55 amMDW - ONT
1 stop19h 54mFrontier
Deal found 5/29$143
Mon 6/1012:59 amONT - ORD
1 stop21h 41mFrontier
Wed 6/128:23 pmORD - ONT
1 stop12h 40mFrontier
Deal found 5/29$144
Tue 8/138:35 pmONT - ORD
1 stop6h 12mFrontier
Sat 8/245:56 pmORD - ONT
1 stop7h 48mFrontier
Deal found 5/29$145

Cheap American Airlines flights from Ontario to Chicago

Explore cheap flight options specifically provided by American Airlines for the route between Ontario and Chicago. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 30, 2024.
Browse through some of the cheapest American Airlines flights traveling from Ontario to Chicago. Check back soon if you're not seeing flights that suit your needs.
Sat 6/157:26 pmONT - ORD
1 stop7h 58mAmerican Airlines
Mon 6/245:05 amORD - ONT
1 stop5h 42mAmerican Airlines
Deal found 5/29$268
Sat 6/87:26 pmONT - ORD
1 stop7h 58mAmerican Airlines
Sat 6/155:05 amORD - ONT
1 stop5h 42mAmerican Airlines
Deal found 5/29$287
Sat 6/87:26 pmONT - ORD
1 stop7h 58mAmerican Airlines
Sat 6/155:05 amORD - ONT
1 stop5h 42mAmerican Airlines
Deal found 5/29$289
Thu 6/69:24 amONT - ORD
2 stops10h 01mAmerican Airlines
Sun 6/95:05 amORD - ONT
1 stop5h 42mAmerican Airlines
Deal found 5/29$473
Wed 6/57:26 pmONT - ORD
1 stop7h 58mAmerican Airlines
Mon 6/103:10 pmORD - ONT
2 stops8h 30mAmerican Airlines
Deal found 5/29$528
Fri 6/76:30 amONT - ORD
1 stop7h 16mAmerican Airlines
Fri 6/76:39 pmORD - ONT
1 stop7h 20mAmerican Airlines
Deal found 5/29$778
Sat 6/84:36 pmONT - ORD
1 stop5h 42mAmerican Airlines
Wed 6/125:05 amORD - ONT
1 stop5h 42mAmerican Airlines
Deal found 5/30$1,112

Cheap Ontario to Chicago flights in May & June 2024

Find cheap flight options from Ontario to Chicago specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,740,132 searches. Prices were last updated on May 30, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to Chicago in 2024. More deals are always being added, so be sure to check back regularly.
Fri 6/712:48 amONT - MDW
1 stop18h 42mFrontier
Thu 6/1310:41 pmMDW - ONT
1 stop27h 03mFrontier
Deal found 5/29$138
Fri 6/712:48 amONT - ORD
1 stop18h 18mFrontier
Thu 6/138:23 pmORD - ONT
1 stop23h 05mFrontier
Deal found 5/29$138
Wed 6/58:55 pmONT - MDW
1 stop6h 34mFrontier
Wed 6/122:32 pmMDW - ONT
1 stop6h 39mFrontier
Deal found 5/29$139
Wed 6/512:49 amONT - ORD
1 stop21h 51mFrontier
Tue 6/118:23 pmORD - ONT
1 stop23h 25mFrontier
Deal found 5/28$139
Sat 6/89:35 pmONT - MDW
1 stop5h 46mFrontier
Wed 6/122:32 pmMDW - ONT
1 stop6h 39mFrontier
Deal found 5/29$140
Wed 6/52:39 pmONT - ORD
1 stop12h 44mFrontier
Mon 6/109:43 pmORD - ONT
1 stop28h 16mFrontier
Deal found 5/29$140
Fri 6/712:48 amONT - ORD
1 stop18h 18mFrontier
Wed 6/129:53 pmORD - ONT
1 stop28h 06mFrontier
Deal found 5/29$141
Wed 6/58:55 pmONT - MDW
1 stop6h 34mFrontier
Sat 6/84:58 pmMDW - ONT
1 stop7h 16mFrontier
Deal found 5/29$142
Mon 6/1012:59 amONT - ORD
1 stop21h 41mFrontier
Sat 6/158:35 pmORD - ONT
1 stop12h 28mFrontier
Deal found 5/30$142

Ontario to Chicago 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Chicago in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 30, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to Chicago in 2024. More deals are always being added, so be sure to check back regularly.
Tue 9/1712:49 amONT - MDW
1 stop9h 03mFrontier
Tue 9/2410:00 pmMDW - ONT
1 stop22h 09mFrontier
Deal found 5/29$136
Mon 9/912:49 amONT - ORD
1 stop17h 32mFrontier
Tue 9/247:30 pmORD - ONT
1 stop19h 52mFrontier
Deal found 5/29$136
Fri 6/712:48 amONT - MDW
1 stop18h 42mFrontier
Thu 6/1310:41 pmMDW - ONT
1 stop27h 03mFrontier
Deal found 5/29$138
Fri 6/712:48 amONT - ORD
1 stop18h 18mFrontier
Thu 6/138:23 pmORD - ONT
1 stop23h 05mFrontier
Deal found 5/29$138
Wed 6/58:55 pmONT - MDW
1 stop6h 34mFrontier
Wed 6/122:32 pmMDW - ONT
1 stop6h 39mFrontier
Deal found 5/29$139
Wed 6/512:49 amONT - ORD
1 stop21h 51mFrontier
Tue 6/118:23 pmORD - ONT
1 stop23h 25mFrontier
Deal found 5/28$139
Sat 6/89:35 pmONT - MDW
1 stop5h 46mFrontier
Wed 6/122:32 pmMDW - ONT
1 stop6h 39mFrontier
Deal found 5/29$140
Wed 6/52:39 pmONT - ORD
1 stop12h 44mFrontier
Mon 6/109:43 pmORD - ONT
1 stop28h 16mFrontier
Deal found 5/29$140
Fri 6/712:48 amONT - ORD
1 stop18h 18mFrontier
Wed 6/129:53 pmORD - ONT
1 stop28h 06mFrontier
Deal found 5/29$141

Non-stop flights to Chicago from Ontario

Discover non-stop flight options from Ontario to Chicago. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 30, 2024.
For a quicker trip, book one of these direct flights from Ontario to Chicago. Users seeking other options on flights from Ontario to Chicago should update the search form at the top of the page.
Tue 6/115:25 amONT - MDW
Nonstop3h 50mSouthwest
Wed 6/122:35 pmMDW - ONT
Nonstop4h 05mSouthwest
Deal found 5/29$680
Tue 6/115:25 amONT - MDW
Nonstop3h 50mSouthwest
Fri 6/142:05 pmMDW - ONT
Nonstop4h 05mSouthwest
Deal found 5/29$726

Ontario to Chicago flights leaving soon

Find last-minute flight options from Ontario to Chicago for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 30, 2024.
Have a look at some of the last-minute flights available departing from Ontario to Chicago. To prevent any unwanted surprises, users should verify their flight info before booking.
Fri 6/712:48 amONT - MDW
1 stop18h 42mFrontier
Thu 6/1310:41 pmMDW - ONT
1 stop27h 03mFrontier
Deal found 5/29$138
Fri 6/712:48 amONT - ORD
1 stop18h 18mFrontier
Thu 6/138:23 pmORD - ONT
1 stop23h 05mFrontier
Deal found 5/29$138
Wed 6/58:55 pmONT - MDW
1 stop6h 34mFrontier
Wed 6/122:32 pmMDW - ONT
1 stop6h 39mFrontier
Deal found 5/29$139
Wed 6/512:49 amONT - ORD
1 stop21h 51mFrontier
Tue 6/118:23 pmORD - ONT
1 stop23h 25mFrontier
Deal found 5/28$139
Sat 6/89:35 pmONT - MDW
1 stop5h 46mFrontier
Wed 6/122:32 pmMDW - ONT
1 stop6h 39mFrontier
Deal found 5/29$140
Wed 6/52:39 pmONT - ORD
1 stop12h 44mFrontier
Mon 6/109:43 pmORD - ONT
1 stop28h 16mFrontier
Deal found 5/29$140
Fri 6/712:48 amONT - ORD
1 stop18h 18mFrontier
Wed 6/129:53 pmORD - ONT
1 stop28h 06mFrontier
Deal found 5/29$141
Fri 6/712:48 amONT - MDW
1 stop18h 42mFrontier
Tue 6/118:02 pmMDW - ONT
1 stop23h 46mFrontier
Deal found 5/30$142
Fri 6/712:48 amONT - ORD
1 stop18h 18mFrontier
Wed 6/128:23 pmORD - ONT
1 stop12h 40mFrontier
Deal found 5/30$142

One-way flights to Chicago from Ontario

Search for one-way flight options from Ontario to Chicago. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,740,132 searches. Data last updated May 30, 2024.
Some of the best available deals we've found on one-way flights from Ontario to Chicago. Users in need of a round-trip flight from Ontario to Chicago instead should update the search form at the top of page.
Wed 6/58:55 pmONT - MDW
1 stop6h 34mFrontier
Deal found 5/29$70
Wed 6/58:55 pmONT - ORD
1 stop6h 28mFrontier
Deal found 5/29$70
Wed 6/1212:49 amONT - MDW
1 stop8h 19mFrontier
Deal found 5/29$71
Mon 7/112:59 amONT - MDW
1 stop14h 11mFrontier
Deal found 5/29$73
Tue 8/208:35 pmONT - MDW
1 stop7h 58mFrontier
Deal found 5/29$74
Tue 8/208:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 5/29$74
Thu 6/139:40 pmONT - ORD
1 stop6h 02mFrontier
Deal found 5/29$75
Tue 6/412:59 amONT - MDW
1 stop9h 01mFrontier
Deal found 5/29$76
Fri 6/712:48 amONT - MDW
1 stop18h 42mFrontier
Deal found 5/29$77

Find flights from Ontario to Chicago within your budget

Customize your flight search to find flights from Ontario to Chicago 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 2,740,132 searches. Data last updated May 30, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$136 - $268

Route

Depart

Return

Price

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Mon 9/9

1 stop17h 32m

Chicago O'Hare Intl

Tue 9/24

1 stop19h 52m

$136

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Mon 6/10

1 stop14h 30m

Chicago O'Hare Intl

Thu 6/13

1 stop18h 56m

$138

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Tue 8/20

1 stop22h 14m

Chicago O'Hare Intl

Mon 8/26

1 stop24h 39m

$139

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Mon 6/10

1 stop9h 44m

Chicago O'Hare Intl

Sat 6/15

1 stop12h 28m

$140

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Mon 6/10

1 stop14h 30m

Chicago O'Hare Intl

Sat 6/15

1 stop12h 28m

$141

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Mon 6/10

1 stop14h 30m

Chicago O'Hare Intl

Thu 6/13

1 stop23h 05m

$142

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Mon 6/10

1 stop21h 41m

Chicago O'Hare Intl

Wed 6/12

1 stop12h 40m

$144

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Sat 8/31

2 stops8h 50m

Chicago O'Hare Intl

Tue 9/3

1 stop6h 29m

$241

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Sat 6/15

1 stop7h 58m

Chicago O'Hare Intl

Mon 6/24

1 stop5h 42m

$268

Flights are sorted by cheapest first

Deals found on 5/29

How far ahead should I book a flight from Ontario to Chicago?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Chicago. Price data was last updated on May 24, 2024.
The best time to book flights from Ontario to Chicago is 25 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
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When is the cheapest time to fly from Ontario to Chicago?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Chicago. Price data was last updated on May 26, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ontario to Chicago flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Best time to book a flight from Ontario to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago from Ontario 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.

Temperature and rainfall in Chicago by month

Plan your trip to Chicago by taking into account the average temperature and rainfall totals by month.

CHI

Temperature

23 - 73.4 °F

Reviews of airlines servicing Chicago

Get insights into the airlines that provide service to Chicago. 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 Chicago. Reviews last updated May 30, 2024.
To help decide which airline to fly from Ontario to Chicago, see what other customers have to say about Frontier, American Airlines and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
5,956 reviews
Check prices

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Comfort

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.2
Very good
5,956 reviews
Southwest
8.2
Very good
5,956 reviews
Check prices

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Comfort

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.1
Very good
9,192 reviews
Southwest
8.2
Very good
5,956 reviews
Check prices

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Comfort

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
10,457 reviews
Southwest
8.2
Very good
5,956 reviews
Check prices

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Comfort

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Avianca
7.5
Good
3,651 reviews
Southwest
8.2
Very good
5,956 reviews
Check prices

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Comfort

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
10,777 reviews
Southwest
8.2
Very good
5,956 reviews
Check prices

Food

7.3

Crew

8.7

Boarding

8.3

Entertainment

7.8

Overall

8.2

Comfort

8.1

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Related info for your journey

Find useful and relevant information for your journey from Ontario to Chicago. 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 from for flights from Ontario to Chicago?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Chicago. You should not have trouble finding flights to Chicago from Ontario; the airport handles an average of 1 outbound flight to Chicago per day. You should also have plenty of airline options to choose from since 5 airlines have flights from the Ontario airport to Chicago. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

  • Can I find flights from Ontario to Chicago for under $200 on Cheapflights?

    Yes, there are multiple flights from Ontario to Chicago for under $200. The cheapest flight booked recently is on Frontier for just $136, but on average you can expect to pay $151.

  • Are there nonstop flights from Ontario to Chicago for under $700 on Cheapflights?

    Cheapflights has at least 2 direct flights from Ontario to Chicago under $700. A good price for a nonstop flight from Ontario to Chicago is less than $703.

  • Are there last-minute flights available from Ontario to Chicago for under $200?

    There are currently 20+ open flights from Ontario to Chicago within the next 7 days for less than $200.

  • What is the cheapest airline to fly from Ontario to Chicago round-trip?

    Cheapflights users have booked flights from Ontario to Chicago round-trip from $136. This flight start at 57% lower than the current average price 3 months from now.

  • What are the most popular routes from Ontario to Chicago?

    Most travelers choose Ontario - Chicago O'Hare Intl, Ontario - Chicago Midway or Ontario - Chicago Greater Rockford when deciding on the best route from Ontario to Chicago.

  • What does ONT to ORD mean?

    ONT and ORD are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. ONT to ORD refers to a flight route from Ontario Airport to Chicago O'Hare Intl Airport. Chicago Midway Airport (MDW), Chicago Greater Rockford Airport (RFD) are other airports near this flight route and their unique identifiers/IATA codes.

  • Can I find deals for flights from Ontario to Chicago that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to Chicago flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ontario to Chicago with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to Chicago flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Ontario to Chicago that include hotel bookings?

    Yes. In addition to deals on Ontario to Chicago flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Chicago?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Chicago.

  • Can I find deals for business class flights from Ontario to Chicago?

    Yes. Cheapflights offers flight deals from Ontario to Chicago by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Ontario to Chicago that allow pets onboard?

    Many airlines flying from Ontario to Chicago offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ontario to Chicago?

    Yes, you can often find last-minute deals on Ontario to Chicago flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ontario to Chicago flight deals updated?

    The Ontario to Chicago flight deals you see on this page were last updated on 5/29.

  • What are the most popular airlines that fly from Ontario to Chicago?

    American Airlines, Delta and Frontier are the most popular airlines when flying from Ontario to Chicago.

  • What is the cheapest month to book a flight from Ontario to Chicago?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Chicago (average of $244). Flying from Ontario to Chicago in June is currently the most expensive (average of $326). 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 Ontario to Chicago
See prices for flight routes from nearby airports that may be better suited for you.

Los Angeles to O'Hare Intl flights
San Francisco to O'Hare Intl flights
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San Francisco to Midway flights
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Ontario to St. Louis flights
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San Francisco to St. Louis flights
Long Beach to O'Hare Intl flights
San Jose to Midway flights
Burbank to Midway flights
Oakland to Midway flights
Palm Springs to O'Hare Intl flights
Las Vegas to Midway flights
Santa Ana to St. Louis flights
Las Vegas to St. Louis flights
Fresno to Midway flights
Reno to O'Hare Intl flights
San Diego to St. Louis flights
Sacramento to St. Louis flights
Oakland to St. Louis flights
Los Angeles to Rockford flights
Los Angeles to Moline flights
Palm Springs to Midway flights
Burbank to St. Louis flights
Santa Barbara to O'Hare Intl flights
Ontario to Moline flights
San Jose to St. Louis flights
Reno to Midway flights
Santa Ana to Moline flights
Long Beach to St. Louis flights
Long Beach to Midway flights
Oakland to Rockford flights
Fresno to St. Louis flights
San Jose to Rockford flights
Monterey to O'Hare Intl flights
Medford to O'Hare Intl flights
Santa Ana to Bloomington flights

Top 5 airlines flying from Ontario to Chicago

Discover the top 5 airlines that operate flights from Ontario to Chicago. 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 2,740,132 searches. Data last updated May 30, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$105Average$257FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
FrontierCheapest$123Average$227FlexibilityNo cancel feeOn-time62%
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DeltaCheapest$276Average$412FlexibilityNo cancel feeOn-timeN/A
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American AirlinesCheapest$292Average$427FlexibilityNo cancel feeOn-time71%
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United AirlinesCheapest$299Average$468FlexibilityNo cancel feeOn-time69%
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Search flights from Ontario to Chicago by cabin class

Find flights from Ontario to Chicago, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Hourly flight availability from Ontario to Chicago

Find hourly flight availability from Ontario to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 30, 2024.
10%of flight departuresEarly morningMidnight to 6 am
80%of flight departuresMorning6 am to noon
10%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Ontario to Chicago

Explore weekly flight availability from Ontario to Chicago. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 30, 2024.
Sunday1daily flight
Monday2daily flights
Tuesday2daily flights
Wednesday2daily flights
Thursday2daily flights
Friday2daily flights
Saturday2daily flights

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Fly with Cheapflights

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How does Cheapflights help users find flights from Ontario to Chicago?

When you search for this flight from Ontario to Chicago, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Chicago?

Cheapflights helps you find that perfect flight to Chicago from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ontario to Chicago with no change fees?

Yes, we can. To see specific flights from Ontario to Chicago with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Ontario to Chicago become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Chicago from Ontario today and book when prices fit your budget.

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