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Cheap flights from Ontario (ONT) to Illinois 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 6/14. 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 — ORD
Jun 7 — Jun 141
From?
To?
Fri 6/7
Fri 6/14
1 adult, Economy
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How far in advance should I book a flight from Ontario to Illinois?

To save up to 71% on this flight, we recommend booking at least 60 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ontario to Illinois from $319 1-2 weeks out and tickets from $507 for flights departing within the next 72 hours.

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

Our data shows that January tends to be the cheapest month to fly to Illinois from Ontario. Users have commonly found prices around $313 for the month, but tickets can be as low as $135. Due to multiple factors, prepare for potentially higher prices in March.

What is the cheapest time of day to fly from ONT to IL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Illinois as you normally would.

Cheap Delta flights from Ontario to Illinois

Explore cheap flight options specifically provided by Delta for the route between Ontario and Illinois. 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 2,810,401 searches. Data last updated June 2, 2024.
Check out some of the cheapest Delta flights we've come across from Ontario to Illinois. Come back soon if you're not finding the exact deal you're looking for.
Tue 8/2011:23 amONT - MDW
1 stop8h 23mDelta
Tue 8/2712:35 pmMDW - ONT
1 stop10h 05mDelta
Deal found 5/31$236
Sat 8/316:00 amONT - ORD
2 stops8h 50mDelta
Tue 9/37:30 pmORD - ONT
1 stop6h 29mDelta
Deal found 5/31$241
Sat 8/315:00 pmONT - ORD
2 stops13h 13mDelta
Tue 9/33:50 pmORD - ONT
2 stops10h 09mDelta
Deal found 5/31$246
Mon 6/1011:40 amONT - ORD
1 stop10h 18mDelta
Tue 7/97:30 pmORD - ONT
1 stop6h 29mDelta
Deal found 6/1$279
Wed 7/175:00 pmONT - ORD
2 stops12h 30mDelta
Sat 7/207:35 amORD - ONT
1 stop6h 40mDelta
Deal found 5/31$284
Thu 8/226:50 amONT - ORD
1 stop7h 55mDelta
Wed 8/287:35 amORD - ONT
1 stop6h 42mDelta
Deal found 5/31$287
Fri 6/76:30 pmONT - MDW
2 stops12h 18mDelta
Mon 6/102:24 pmMDW - ONT
2 stops11h 18mDelta
Deal found 6/1$289
Tue 6/1110:00 pmONT - ORD
1 stop8h 04mDelta
Tue 7/97:30 pmORD - ONT
1 stop6h 29mDelta
Deal found 6/1$322
Fri 6/76:30 pmONT - ORD
2 stops12h 51mDelta
Fri 6/147:20 pmORD - ONT
1 stop6h 22mDelta
Deal found 6/1$327

Cheap Frontier flights from Ontario to Illinois

Explore cheap flight options specifically provided by Frontier for the route between Ontario and Illinois. 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 2,810,401 searches. Data last updated June 2, 2024.
Take a gander at the lowest prices we've found on Frontier flights from Ontario to Illinois. Deals are refreshing constantly so come back soon for more options.
Tue 9/1712:00 pmONT - ORD
1 stop14h 47mFrontier
Tue 9/247:30 pmORD - ONT
1 stop24h 39mFrontier
Deal found 5/30$136
Mon 9/95:30 pmONT - MDW
1 stop11h 03mFrontier
Tue 9/2410:00 pmMDW - ONT
1 stop13h 06mFrontier
Deal found 5/31$137
Tue 8/2012:49 amONT - ORD
1 stop22h 14mFrontier
Wed 8/287:30 pmORD - ONT
1 stop15h 36mFrontier
Deal found 6/1$138
Tue 8/2012:49 amONT - ORD
1 stop22h 14mFrontier
Wed 8/287:30 pmORD - ONT
1 stop20h 32mFrontier
Deal found 5/31$139
Mon 8/195:30 pmONT - ORD
1 stop9h 17mFrontier
Sat 8/245:56 pmORD - ONT
1 stop7h 48mFrontier
Deal found 6/1$140
Tue 8/2012:00 pmONT - ORD
1 stop14h 47mFrontier
Sat 8/245:56 pmORD - ONT
1 stop7h 48mFrontier
Deal found 5/31$141
Tue 8/205:30 pmONT - ORD
1 stop9h 17mFrontier
Thu 8/227:30 pmORD - ONT
1 stop15h 36mFrontier
Deal found 6/1$142
Mon 6/1012:55 pmONT - MDW
1 stop14h 34mFrontier
Thu 6/138:43 pmMDW - ONT
1 stop14h 21mFrontier
Deal found 6/1$143
Mon 8/198:35 pmONT - ORD
1 stop6h 12mFrontier
Mon 8/267:30 pmORD - ONT
1 stop15h 36mFrontier
Deal found 6/1$145

Cheap Ontario to Illinois flights in June & July 2024

Find cheap flight options from Ontario to Illinois specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,810,401 searches. Prices were last updated on June 2, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in June and July 2024. Check back regularly for other flight deals.
Thu 6/69:40 pmONT - STL
2 stops22h 19mFrontier
Mon 6/108:22 pmSTL - ONT
1 stop13h 05mFrontier
Deal found 6/1$148
Mon 6/312:59 amONT - STL
1 stop10h 10mFrontier
Sat 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 6/1$150
Thu 6/69:40 pmONT - STL
2 stops22h 19mFrontier
Sat 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 6/1$155
Wed 6/56:06 pmONT - ORD
1 stop9h 17mFrontier
Sat 6/158:35 pmORD - ONT
1 stop12h 28mFrontier
Deal found 5/31$166
Tue 6/117:26 pmONT - MDW
1 stop7h 07mFrontier
Thu 7/115:01 amMDW - ONT
1 stop8h 01mFrontier
Deal found 5/31$167
Fri 6/1412:44 amONT - STL
1 stop6h 45mFrontier
Thu 6/273:32 pmSTL - ONT
1 stop16h 51mFrontier
Deal found 5/31$168
Fri 6/1412:44 amONT - MDW
1 stop18h 46mFrontier
Mon 7/18:58 pmMDW - ONT
1 stop17h 56mFrontier
Deal found 5/31$168
Fri 6/78:50 pmONT - ORD
1 stop6h 35mFrontier
Sat 6/88:35 pmORD - ONT
1 stop12h 28mFrontier
Deal found 5/31$168
Sun 6/97:23 pmONT - MDW
1 stop7h 28mFrontier
Sat 6/158:50 pmMDW - ONT
1 stop12h 13mFrontier
Deal found 5/31$169

Ontario to Illinois 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Illinois in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,810,401 searches. Data last updated June 2, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in June and July 2024. Check back regularly for other flight deals.
Mon 9/1612:51 pmONT - STL
1 stop19h 27mFrontier
Sat 9/217:29 pmSTL - ONT
1 stop13h 39mFrontier
Deal found 5/31$138
Fri 9/612:49 amONT - STL
1 stop6h 48mFrontier
Tue 9/107:29 pmSTL - ONT
1 stop24h 40mFrontier
Deal found 6/1$139
Fri 8/3012:49 amONT - STL
1 stop6h 48mFrontier
Tue 9/310:32 pmSTL - ONT
1 stop27h 07mFrontier
Deal found 6/1$140
Sat 8/318:35 pmONT - STL
1 stop11h 43mFrontier
Tue 9/37:29 pmSTL - ONT
1 stop24h 40mFrontier
Deal found 6/1$141
Thu 6/69:40 pmONT - STL
2 stops22h 19mFrontier
Mon 6/108:22 pmSTL - ONT
1 stop13h 05mFrontier
Deal found 6/1$148
Mon 6/312:59 amONT - STL
1 stop10h 10mFrontier
Sat 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 6/1$150
Fri 9/1312:49 amONT - STL
1 stop6h 48mFrontier
Mon 9/167:29 pmSTL - ONT
1 stop24h 40mFrontier
Deal found 5/31$153
Thu 6/69:40 pmONT - STL
2 stops22h 19mFrontier
Sat 6/88:02 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 6/1$155
Wed 8/146:57 amONT - MDW
1 stop7h 02mFrontier
Sat 8/176:00 amMDW - ONT
1 stop19h 44mFrontier
Deal found 5/30$163

Non-stop flights to Illinois from Ontario

Discover non-stop flight options from Ontario to Illinois. 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 2,810,401 searches. Data last updated June 2, 2024.
For a shorter flight, select one of these non-stop flights from Ontario to Illinois. Select from other flights from Ontario to Illinois by using the search form above.
Sun 6/169:25 amONT - MDW
Nonstop3h 45mSouthwest
Thu 6/202:05 pmMDW - ONT
Nonstop4h 05mSouthwest
Deal found 6/1$658

Ontario to Illinois flights leaving soon

Find last-minute flight options from Ontario to Illinois 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 2,810,401 searches. Data last updated June 2, 2024.
Users seeking a last-minute flight from Ontario to Illinois should consider booking one of these fares. It's wise to confirm all flight details are correct before booking.
Sat 6/82:29 pmONT - MDW
1 stop12h 52mFrontier
Sat 6/158:50 pmMDW - ONT
1 stop12h 13mFrontier
Deal found 6/1$140
Sat 6/82:29 pmONT - MDW
1 stop12h 52mFrontier
Thu 6/135:01 amMDW - ONT
1 stop20h 58mFrontier
Deal found 6/1$141
Sat 6/82:29 pmONT - MDW
1 stop12h 52mFrontier
Tue 6/118:02 pmMDW - ONT
1 stop23h 46mFrontier
Deal found 6/1$142
Mon 6/1012:55 pmONT - MDW
1 stop14h 34mFrontier
Thu 6/138:43 pmMDW - ONT
1 stop14h 21mFrontier
Deal found 6/1$143
Sat 6/89:35 pmONT - MDW
1 stop5h 46mFrontier
Wed 6/125:55 amMDW - ONT
1 stop19h 54mFrontier
Deal found 6/1$149
Sat 6/89:35 pmONT - MDW
1 stop5h 46mFrontier
Sat 6/155:40 amMDW - ONT
1 stop20h 09mFrontier
Deal found 6/1$150
Sun 6/912:59 amONT - MDW
1 stop9h 01mFrontier
Wed 6/128:58 pmMDW - ONT
1 stop12h 05mFrontier
Deal found 6/1$154
Tue 6/1110:31 pmONT - ORD
1 stop28h 54mFrontier
Thu 6/138:23 pmORD - ONT
1 stop14h 41mFrontier
Deal found 5/31$166
Tue 6/117:26 pmONT - MDW
1 stop7h 07mFrontier
Thu 7/115:01 amMDW - ONT
1 stop8h 01mFrontier
Deal found 6/1$167

One-way flights to Illinois from Ontario

Search for one-way flight options from Ontario to Illinois. 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 2,810,401 searches. Data last updated June 2, 2024.
Take a look at some of the one-way flights we've detected from Ontario to Illinois. For those needing a return trip from Ontario, there is a search form available above.
Fri 6/1412:44 amONT - STL
1 stop6h 45mFrontier
Deal found 6/1$70
Tue 6/117:26 pmONT - MDW
1 stop7h 07mFrontier
Deal found 6/1$70
Wed 9/48:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 5/31$70
Wed 6/1212:49 amONT - MDW
1 stop8h 19mFrontier
Deal found 6/1$72
Tue 9/38:35 pmONT - MDW
1 stop7h 58mFrontier
Deal found 6/1$74
Sat 8/318:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 5/31$74
Sat 8/248:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 6/1$75
Thu 9/129:36 pmONT - STL
1 stop10h 42mFrontier
Deal found 6/1$76
Mon 6/1012:59 amONT - MDW
1 stop10h 10mFrontier
Deal found 6/1$76

Find flights from Ontario to Illinois within your budget

Customize your flight search to find flights from Ontario to Illinois 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 2,810,401 searches. Data last updated June 2, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$136 - $259

Route

Depart

Return

Price

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Tue 9/17

1 stop14h 47m

Chicago O'Hare Intl

Tue 9/24

1 stop24h 39m

$136

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Mon 9/9

1 stop11h 03m

Chicago Midway

Tue 9/24

1 stop13h 06m

$137

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Mon 9/16

1 stop19h 27m

Lambert-St Louis

Sat 9/21

1 stop13h 39m

$138

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Tue 8/20

1 stop9h 03m

Chicago Midway

Wed 8/28

1 stop13h 06m

$138

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Tue 8/20

1 stop22h 14m

Chicago O'Hare Intl

Wed 8/28

1 stop15h 36m

$138

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 9/6

1 stop6h 48m

Lambert-St Louis

Tue 9/10

1 stop24h 40m

$139

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Tue 8/20

1 stop8h 23m

Chicago Midway

Tue 8/27

1 stop10h 05m

$236

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Sat 8/24

1 stop6h 12m

Chicago O'Hare Intl

Sat 8/31

2 stops10h 02m

$251

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Fri 6/14

1 stop7h 58m

Chicago O'Hare Intl

Sat 6/15

1 stop10h 12m

$259

Flights are sorted by cheapest first

Deals found on 5/30

No data available for this route at this time. Please check back soon.

Best time to book a flight from Ontario to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois 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.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated June 2, 2024.
Get a feel of what it's like to fly with Delta, Frontier and American Airlines from Ontario to Illinois by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
5,949 reviews
Check prices

Boarding

8.3

Food

7.3

Entertainment

7.8

Crew

8.7

Comfort

8.1

Overall

8.2

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
5,949 reviews
Southwest
8.2
Very good
5,949 reviews
Check prices

Boarding

8.3

Food

7.3

Entertainment

7.8

Crew

8.7

Comfort

8.1

Overall

8.2

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
9,198 reviews
Southwest
8.2
Very good
5,949 reviews
Check prices

Boarding

8.3

Food

7.3

Entertainment

7.8

Crew

8.7

Comfort

8.1

Overall

8.2

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
10,410 reviews
Southwest
8.2
Very good
5,949 reviews
Check prices

Boarding

8.3

Food

7.3

Entertainment

7.8

Crew

8.7

Comfort

8.1

Overall

8.2

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
10,755 reviews
Southwest
8.2
Very good
5,949 reviews
Check prices

Boarding

8.3

Food

7.3

Entertainment

7.8

Crew

8.7

Comfort

8.1

Overall

8.2

Reviews

1 / 10

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

American Airlines
7.3
Good
14,260 reviews
Southwest
8.2
Very good
5,949 reviews
Check prices

Boarding

8.3

Food

7.3

Entertainment

7.8

Crew

8.7

Comfort

8.1

Overall

8.2

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 Illinois. 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 Illinois?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Illinois.

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

    Yes, there are multiple flights from Ontario to Illinois for under $200. The cheapest flight booked recently is on Frontier for just $136, but on average you can expect to pay $140.

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

    Cheapflights has at least 1 direct flight from Ontario to Illinois under $700. A good price for a nonstop flight from Ontario to Illinois is less than $658.

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

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

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

    The most popular flight routes from Ontario to Illinois are Ontario - Chicago O'Hare Intl, Ontario - Chicago Midway and Ontario - Lambert-St Louis.

  • 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), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI) are other airports near this flight route and their unique identifiers/IATA codes.

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

    The amount of baggage you can bring on your Ontario to Illinois 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 Illinois with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to Illinois 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 Illinois that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Illinois 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 Illinois that allow pets onboard?

    Many airlines flying from Ontario to Illinois 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 Illinois?

    Yes, you can often find last-minute deals on Ontario to Illinois 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 Illinois flight deals updated?

    The Ontario to Illinois flight deals you see on this page were last updated on 6/1.

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

    Consider American Airlines, Delta or Frontier when booking your flight. These represent the most popular airlines when flying from Ontario to Illinois.

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

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

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Top 5 airlines flying from Ontario to Illinois

Discover the top 5 airlines that operate flights from Ontario to Illinois. 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 2,810,401 searches. Data last updated June 2, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$105Average$257FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
FrontierCheapest$123Average$227FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapest$276Average$412FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$292Average$618FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$299Average$520FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
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Newark Airport to Fort Lauderdale flights
Los Angeles to Dubai flights
USA to Hyderabad flights
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Houston to Paris flights
Ontario to Indiana flights

Search flights from Ontario to Illinois by cabin class

Find flights from Ontario to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from Ontario to Illinois

Find hourly flight availability from Ontario to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 2, 2024.
12%of flight departuresEarly morningMidnight to 6 am
88%of flight departuresMorning6 am to noon
0%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Illinois. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Ontario to Illinois for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Yes! Cheapflights helps users easily find flights from Ontario to Illinois with no change fees.

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

Not ready to book yet? You can track prices for flights from Ontario to Illinois on Cheapflights with our Price Alert feature and get notified when better prices are available.

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