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Illinois

$106+ Cheap flights from Ontario to Illinois

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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap flight deals from Ontario to Illinois

Keep the following information in mind while searching for Ontario to Illinois flight deals. Data was last updated July 29, 2025.

Round-trip from

$148
(Trip.com)

One-way from

$106
(American Airlines)

Popular in

December

Cheapest in

June

Average price

$270

Good round-trip deal

$170 or less

Good one-way deal

$101 or less
From Ontario to Illinois
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One-way flight from Ontario to Illinois
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Highest demand for flights based on searches. 7% potential increase in price ($21 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 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 Ontario to Illinois.
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Price to beat on a one-way flight from Ontario to Illinois.
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Find flight deals from Ontario to Illinois

Cheapest flights from Ontario to Illinois
Explore the most affordable flight options available from Ontario to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/227:55 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Sat 9/69:35 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 7/26$148
This Kissandfly.com 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/47:00 amYYZ - ORD
Nonstop1h 59mLufthansa
Sun 9/77:10 amORD - YYZ
Nonstop1h 48mLufthansa
Deal found 7/27$150
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/277:50 amYTZ - MDW
Nonstop1h 49mMultiple Airlines
Tue 9/305:20 pmMDW - YTZ
Nonstop1h 42mMultiple Airlines
Deal found 7/27$150
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/199:00 pmYYZ - ORD
Nonstop2h 07mUnited Airlines
Mon 9/2211:40 amORD - YYZ
1 stop4h 39mUnited Airlines
Deal found 7/27$151
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2712:05 pmYYZ - ORD
2 stops9h 11mAir Canada
Wed 9/38:25 pmORD - YYZ
Nonstop1h 43mAir Canada
Deal found 7/27$152
This SmartFares 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/257:55 amYTZ - MDW
Nonstop1h 50mAir Transat
Tue 8/265:20 pmMDW - YTZ
Nonstop1h 42mAir Transat
Deal found 7/26$154
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/123:25 pmYTZ - ORD
1 stop5h 57mAir Canada
Sat 10/1810:40 amORD - YTZ
1 stop5h 05mAir Canada
Deal found 7/27$165
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/191:10 pmYUL - MDW
1 stop4h 14mPorter Airlines
Mon 9/229:35 amMDW - YUL
1 stop8h 10mPorter Airlines
Deal found 7/28$167
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/118:20 amYUL - ORD
Nonstop2h 31mAir Canada
Thu 9/188:25 pmORD - YUL
1 stop4h 25mAir Canada
Deal found 7/28$173
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.
Tue 8/265:29 pmYUL - ORD
Nonstop2h 36mAmerican Airlines
Mon 9/15:20 amORD - YUL
1 stop7h 19mAmerican Airlines
Deal found 7/27$174
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.
Wed 9/107:35 amYYZ - ORD
1 stop7h 31mAmerican Airlines
Wed 9/176:00 amORD - YYZ
1 stop5h 04mAmerican Airlines
Deal found 7/27$186
This flygcity.se 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 flygcity.se is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/308:15 amYUL - ORD
2 stops10h 27mMultiple Airlines
Sun 8/318:10 amORD - YUL
Nonstop2h 26mMultiple Airlines
Deal found 7/27$190

Cheapflights Fare Finder

 
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 2,558,603 searches. Data last updated July 29, 2025.
Use the filters below to find and compare flights from Ontario to Illinois that are best for you.

Fly from

Ontario

Fly to

Illinois

Route

Depart

Return

Price

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 8/22

7:55 am-8:45 am

Nonstop1h 50m

Chicago Midway

Sat 9/6

9:35 am-12:17 pm

Nonstop1h 42m

$148

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 9/4

7:00 am-7:59 am

Nonstop1h 59m

Chicago O'Hare Intl

Sun 9/7

7:10 am-9:58 am

Nonstop1h 48m

$150

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Sat 9/27

7:50 am-8:39 am

Nonstop1h 49m

Chicago Midway

Tue 9/30

5:20 pm-8:02 pm

Nonstop1h 42m

$150

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Fri 9/19

9:00 pm-10:07 pm

Nonstop2h 07m

Chicago O'Hare Intl

Mon 9/22

11:40 am-5:19 pm

1 stop4h 39m

$151

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Wed 8/27

12:05 pm-8:16 pm

2 stops9h 11m

Chicago O'Hare Intl

Wed 9/3

8:25 pm-11:08 pm

Nonstop1h 43m

$152

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 8/25

7:55 am-8:45 am

Nonstop1h 50m

Chicago Midway

Tue 8/26

5:20 pm-8:02 pm

Nonstop1h 42m

$154

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

Sun 10/12

3:25 pm-8:22 pm

1 stop5h 57m

Chicago O'Hare Intl

Sat 10/18

10:40 am-4:45 pm

1 stop5h 05m

$165

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Fri 9/19

1:10 pm-4:24 pm

1 stop4h 14m

Chicago Midway

Mon 9/22

9:35 am-6:45 pm

1 stop8h 10m

$167

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Thu 9/11

8:20 am-9:51 am

Nonstop2h 31m

Chicago O'Hare Intl

Thu 9/18

8:25 pm-1:50 am

1 stop4h 25m

$173

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Tue 8/26

5:29 pm-7:05 pm

Nonstop2h 36m

Chicago O'Hare Intl

Mon 9/1

5:20 am-1:39 pm

1 stop7h 19m

$174

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 60 results
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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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Illinois

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

Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of $245). Flying from Region of Ontario to Illinois in March is currently the most expensive (average of $321). 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 ON to IL?

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 July 29, 2025.

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

Weekly flight availability from Region of Ontario to Illinois

Explore weekly flight availability from Ontario to Illinois. 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 July 29, 2025.

The most flights from CAON to USIL are scheduled on a Monday (61 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (47 on average).

How much does it cost to fly round-trip from Region of Ontario to Illinois?

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 July 29, 2025.
See what other customers who have flown with Porter Airlines, Delta, and Air Transat from Ontario to Illinois have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
317 reviews

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.7

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Porter Airlines
8.0
Very good
317 reviews
Porter Airlines
8.0
Very good
317 reviews

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.7

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Delta
8.0
Very good
7,977 reviews
Porter Airlines
8.0
Very good
317 reviews

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.7

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Air Transat
7.7
Good
424 reviews
Porter Airlines
8.0
Very good
317 reviews

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.7

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
United Airlines
7.4
Good
8,899 reviews
Porter Airlines
8.0
Very good
317 reviews

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.7

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
American Airlines
7.2
Good
10,000 reviews
Porter Airlines
8.0
Very good
317 reviews

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Food

7.6

Crew

8.7

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience

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 are the cheapest airlines to fly from Region of Ontario to Illinois one-way?

    $106 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Air Transat and Porter Airlines, with prices starting from $106 and $107, respectively.

  • 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.

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

    Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of $245). Flying from Region of Ontario to Illinois in March is currently the most expensive (average of $321). 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 4 airlines flying from Ontario to Illinois

Discover the top 4 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 2,558,603 searches. Data last updated July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$155Average$412FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$158Average$257FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$165Average$418FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$211Average$334FlexibilityNo cancel feeOn-time71%

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