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Cheap flights from Ontario (ONT) to Illinois from $45

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 5/15. 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
Apr 30 — May 71
From?
To?
Tue 4/30
Tue 5/7
1 adult, Economy
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How far in advance should I book a flight from Ontario to Illinois?

To save up to 79% on this flight, we recommend booking at least 46 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 $297 1-2 weeks out and tickets from $499 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 $302 for the month, but tickets can be as low as $93. Due to multiple factors, prepare for potentially higher prices in June.

When is the cheapest time to fly from Ontario to Illinois (ONT - 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 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 3,073,952 searches. Data last updated April 25, 2024.
Check out some of the cheapest Frontier flights we've come across from Ontario to Illinois. Come back soon if you're not finding the exact deal you're looking for.
Wed 5/1512:39 pmONT - MDW
1 stop15h 11mFrontier
Tue 5/216:00 amMDW - ONT
1 stop9h 24mFrontier
Deal found 4/24$89
Mon 5/209:57 pmONT - STL
1 stop10h 16mFrontier
Wed 5/2210:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 4/24$90
Mon 5/2012:59 amONT - MDW
1 stop14h 13mFrontier
Wed 5/225:01 amMDW - ONT
1 stop10h 33mFrontier
Deal found 4/24$93
Sat 5/1810:10 pmONT - MDW
1 stop5h 40mFrontier
Wed 5/225:01 amMDW - ONT
1 stop10h 33mFrontier
Deal found 4/24$99
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/24$100
Sun 5/196:09 pmONT - STL
1 stop14h 04mFrontier
Tue 5/217:23 pmSTL - ONT
1 stop22h 42mFrontier
Deal found 4/24$101
Mon 5/1310:59 pmONT - STL
1 stop9h 10mFrontier
Wed 5/158:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/24$103
Tue 5/712:39 pmONT - MDW
1 stop20h 57mFrontier
Tue 5/212:45 pmMDW - ONT
1 stop11h 14mFrontier
Deal found 4/24$104
Mon 5/204:31 pmONT - MDW
1 stop21h 06mFrontier
Tue 5/219:10 pmMDW - ONT
1 stop13h 54mFrontier
Deal found 4/24$106

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 3,073,952 searches. Data last updated April 25, 2024.
Take a gander at the lowest prices we've found on Delta flights from Ontario to Illinois. Deals are refreshing constantly so come back soon for more options.
Sat 5/251:20 pmONT - ORD
1 stop6h 38mDelta
Tue 5/287:30 pmORD - ONT
1 stop6h 13mDelta
Deal found 4/24$236
Wed 6/126:59 pmONT - ORD
2 stops10h 33mDelta
Tue 6/187:20 pmORD - ONT
1 stop6h 22mDelta
Deal found 4/25$279
Sat 4/276:00 amONT - ORD
1 stop8h 47mDelta
Thu 5/27:40 amORD - ONT
1 stop6h 32mDelta
Deal found 4/24$312
Tue 4/305:40 pmONT - ORD
2 stops12h 00mDelta
Wed 5/17:50 pmORD - ONT
1 stop6h 09mDelta
Deal found 4/25$317
Tue 4/307:00 amONT - ORD
2 stops12h 58mDelta
Wed 5/15:25 pmORD - ONT
2 stops8h 34mDelta
Deal found 4/24$322
Sat 6/16:00 amONT - MLI
1 stop8h 22mDelta
Sat 6/85:35 pmMLI - ONT
1 stop7h 25mDelta
Deal found 4/23$344
Mon 5/610:00 pmONT - ORD
1 stop8h 17mDelta
Mon 5/131:32 pmORD - ONT
2 stops11h 15mDelta
Deal found 4/24$378
Sun 9/1512:45 pmONT - MLI
1 stop7h 41mDelta
Tue 10/85:00 pmMLI - ONT
1 stop7h 28mDelta
Deal found 4/23$380
Tue 4/305:45 amONT - ORD
2 stops10h 50mDelta
Mon 5/131:32 pmORD - ONT
2 stops11h 15mDelta
Deal found 4/24$383

Cheap Ontario to Illinois flights in April & May 2024

Find cheap flight options from Ontario to Illinois specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,073,952 searches. Prices were last updated on April 25, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in April and May 2024. Check back regularly for other flight deals.
Mon 5/209:57 pmONT - STL
1 stop10h 16mFrontier
Wed 5/2210:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 4/24$90
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/24$100
Sun 5/196:09 pmONT - STL
1 stop14h 04mFrontier
Tue 5/217:23 pmSTL - ONT
1 stop22h 42mFrontier
Deal found 4/24$101
Mon 5/1310:59 pmONT - STL
1 stop9h 10mFrontier
Wed 5/158:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/24$103
Mon 5/610:59 pmONT - STL
1 stop9h 19mFrontier
Wed 5/88:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/24$109
Mon 5/1312:59 amONT - STL
1 stop12h 51mFrontier
Thu 5/167:23 pmSTL - ONT
1 stop16h 01mFrontier
Deal found 4/24$114
Fri 5/1012:55 amONT - ORD
1 stop22h 01mFrontier
Sat 5/187:59 pmORD - ONT
1 stop13h 30mFrontier
Deal found 4/24$117
Wed 5/810:49 pmONT - STL
1 stop9h 29mFrontier
Thu 5/910:59 pmSTL - ONT
1 stop10h 09mFrontier
Deal found 4/24$118
Mon 5/612:59 amONT - ORD
1 stop21h 57mFrontier
Tue 5/146:27 pmORD - ONT
1 stop13h 59mFrontier
Deal found 4/24$118

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 3,073,952 searches. Data last updated April 25, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in April and May 2024. Check back regularly for other flight deals.
Mon 5/209:57 pmONT - STL
1 stop10h 16mFrontier
Wed 5/2210:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 4/24$90
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/24$100
Sun 5/196:09 pmONT - STL
1 stop14h 04mFrontier
Tue 5/217:23 pmSTL - ONT
1 stop22h 42mFrontier
Deal found 4/24$101
Mon 5/1310:59 pmONT - STL
1 stop9h 10mFrontier
Wed 5/158:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/24$103
Mon 5/610:59 pmONT - STL
1 stop9h 19mFrontier
Wed 5/88:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/24$109
Mon 5/1312:59 amONT - STL
1 stop12h 51mFrontier
Thu 5/167:23 pmSTL - ONT
1 stop16h 01mFrontier
Deal found 4/24$114
Fri 5/1012:55 amONT - ORD
1 stop22h 01mFrontier
Sat 5/187:59 pmORD - ONT
1 stop13h 30mFrontier
Deal found 4/24$117
Wed 5/810:49 pmONT - STL
1 stop9h 29mFrontier
Thu 5/910:59 pmSTL - ONT
1 stop10h 09mFrontier
Deal found 4/24$118
Mon 5/612:59 amONT - ORD
1 stop21h 57mFrontier
Tue 5/146:27 pmORD - ONT
1 stop13h 59mFrontier
Deal found 4/24$118

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 3,073,952 searches. Data last updated April 25, 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.
Mon 5/67:50 amONT - MDW
Nonstop3h 45mSouthwest
Fri 5/1012:55 pmMDW - ONT
Nonstop4h 10mSouthwest
Deal found 4/24$937

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 3,073,952 searches. Data last updated April 25, 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.
Tue 5/712:59 amONT - ORD
1 stop21h 57mFrontier
Tue 5/146:27 pmORD - ONT
1 stop7h 32mFrontier
Deal found 4/24$117
Mon 5/612:59 amONT - ORD
1 stop21h 57mFrontier
Tue 5/146:27 pmORD - ONT
1 stop13h 59mFrontier
Deal found 4/24$118
Tue 4/3010:49 pmONT - STL
1 stop9h 29mFrontier
Tue 5/74:50 pmSTL - ONT
1 stop9h 09mFrontier
Deal found 4/23$119
Tue 5/72:01 pmONT - ORD
1 stop8h 51mFrontier
Tue 5/218:00 amORD - ONT
1 stop7h 24mFrontier
Deal found 4/24$119
Tue 5/712:59 amONT - ORD
1 stop21h 57mFrontier
Sat 5/116:27 pmORD - ONT
1 stop14h 04mFrontier
Deal found 4/23$121
Mon 5/612:59 amONT - ORD
1 stop21h 57mFrontier
Tue 5/218:00 amORD - ONT
1 stop7h 24mFrontier
Deal found 4/24$124
Mon 5/612:59 amONT - ORD
1 stop21h 57mFrontier
Sat 5/116:27 pmORD - ONT
1 stop7h 32mFrontier
Deal found 4/24$130
Thu 5/210:58 pmONT - STL
1 stop9h 20mFrontier
Sat 5/48:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/24$131
Tue 5/712:59 amONT - ORD
1 stop21h 57mFrontier
Wed 5/156:27 pmORD - ONT
1 stop7h 32mFrontier
Deal found 4/24$136

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 3,073,952 searches. Data last updated April 25, 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.
Wed 5/157:36 pmONT - MDW
1 stop8h 14mFrontier
Deal found 4/24$45
Sat 5/1810:10 pmONT - MDW
1 stop5h 40mFrontier
Deal found 4/25$47
Mon 5/209:57 pmONT - STL
1 stop10h 16mFrontier
Deal found 4/24$51
Mon 5/2012:59 amONT - MDW
1 stop14h 13mFrontier
Deal found 4/24$53
Mon 5/2012:59 amONT - MDW
1 stop14h 13mFrontier
Deal found 4/24$55
Tue 5/1412:39 pmONT - STL
1 stop7h 20mFrontier
Deal found 4/24$59
Mon 5/1312:59 amONT - MDW
1 stop8h 39mFrontier
Deal found 4/24$59
Wed 5/82:11 pmONT - ORD
1 stop8h 41mFrontier
Deal found 4/24$59
Tue 5/147:16 amONT - BMI
1 stop6h 41mFrontier
Deal found 4/24$59

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 3,073,952 searches. Data last updated April 25, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$89 - $236

Route

Depart

Return

Price

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Wed 5/15

1 stop15h 11m

Chicago Midway

Tue 5/21

1 stop9h 24m

$89

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Mon 5/20

1 stop10h 16m

Lambert-St Louis

Wed 5/22

1 stop12h 19m

$90

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Mon 5/20

1 stop14h 13m

Chicago Midway

Wed 5/22

1 stop10h 33m

$93

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Sat 5/18

1 stop5h 40m

Chicago Midway

Wed 5/22

1 stop10h 33m

$99

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 5/17

1 stop9h 09m

Lambert-St Louis

Sat 5/18

1 stop8h 36m

$100

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Sat 5/18

1 stop5h 40m

Chicago Midway

Wed 5/22

1 stop10h 33m

$100

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Sun 5/19

1 stop14h 04m

Lambert-St Louis

Tue 5/21

1 stop22h 42m

$101

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Wed 5/15

1 stop15h 11m

Chicago Midway

Fri 5/17

1 stop13h 54m

$101

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Sat 5/25

1 stop6h 38m

Chicago O'Hare Intl

Tue 5/28

1 stop6h 13m

$236

Flights are sorted by cheapest first

Deals found on 4/24

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

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 April 25, 2024.
Get a feel of what it's like to fly with Frontier, Delta 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
6,180 reviews
Check prices

Entertainment

7.8

Overall

8.2

Crew

8.7

Comfort

8.1

Food

7.4

Boarding

8.3

Reviews

1 / 10

I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.

Southwest
8.2
Very good
6,180 reviews
Southwest
8.2
Very good
6,180 reviews
Check prices

Entertainment

7.8

Overall

8.2

Crew

8.7

Comfort

8.1

Food

7.4

Boarding

8.3

Reviews

1 / 10

I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.

Alaska Airlines
8.1
Very good
9,110 reviews
Southwest
8.2
Very good
6,180 reviews
Check prices

Entertainment

7.8

Overall

8.2

Crew

8.7

Comfort

8.1

Food

7.4

Boarding

8.3

Reviews

1 / 10

I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.

Delta
8.1
Very good
10,975 reviews
Southwest
8.2
Very good
6,180 reviews
Check prices

Entertainment

7.8

Overall

8.2

Crew

8.7

Comfort

8.1

Food

7.4

Boarding

8.3

Reviews

1 / 10

I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.

United Airlines
7.4
Good
11,255 reviews
Southwest
8.2
Very good
6,180 reviews
Check prices

Entertainment

7.8

Overall

8.2

Crew

8.7

Comfort

8.1

Food

7.4

Boarding

8.3

Reviews

1 / 10

I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.

American Airlines
7.3
Good
14,898 reviews
Southwest
8.2
Very good
6,180 reviews
Check prices

Entertainment

7.8

Overall

8.2

Crew

8.7

Comfort

8.1

Food

7.4

Boarding

8.3

Reviews

1 / 10

I was traveling with a companion that utilizes a scooter to get around. We have flown together many times and used other airlines. Southwest by far is the most accommodating airline in the fleet your staff Makes the accessibility easy and convenient for for this type of travel. We would personally like to think the flight teams of our two flights for being very accommodating and helpful throughout our trip.

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 $100 on Cheapflights?

    Yes, there are multiple flights from Ontario to Illinois for under $100. The cheapest flight booked recently is on Frontier for just $89, but on average you can expect to pay $105.

  • Are there nonstop flights from Ontario to Illinois for under $1,000 on Cheapflights?

    Cheapflights has at least 1 direct flight from Ontario to Illinois under $1,000. A good price for a nonstop flight from Ontario to Illinois is less than $937.

  • 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 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 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), Champaign University-Willard Airport (CMI) 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 4/24.

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 3,073,952 searches. Data last updated April 25, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$105Average$261FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
FrontierCheapest$122Average$234FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapest$276Average$459FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
United AirlinesCheapest$296Average$490FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$305Average$632FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
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Reno to Las Vegas flights
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Los Angeles to Dubai 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 April 25, 2024.
0%of flight departuresEarly morningMidnight to 6 am
100%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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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?

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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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