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Cheap flights from Ontario to Illinois from C$ 176

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 14/12. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
29 Nov — 6 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Ontario to Illinois

Enter your travel dates to find the best prices.

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 30 October 2025.

Fri 14/117:00 a.m.YYZ - ORD
1 stop5h 18mAir Canada
Mon 17/118:15 p.m.ORD - YYZ
Nonstop1h 39mAir Canada
Deal found 29/10C$ 253
Wed 3/127:00 a.m.YYZ - ORD
1 stop5h 18mAir Canada
Thu 12/22:00 p.m.ORD - YYZ
Nonstop1h 39mAir Canada
Deal found 29/10C$ 256
Wed 3/1210:58 a.m.YYZ - ORD
1 stop9h 23mAmerican Airlines
Thu 12/27:19 a.m.ORD - YYZ
1 stop4h 43mAmerican Airlines
Deal found 29/10C$ 257
Fri 5/122:30 p.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Mon 8/124:15 p.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 29/10C$ 261
Thu 11/126:00 a.m.YYZ - ORD
Nonstop2h 15mAmerican Airlines
Sun 14/128:10 a.m.ORD - YYZ
Nonstop1h 46mAmerican Airlines
Deal found 29/10C$ 264
Tue 18/116:00 a.m.YYZ - ORD
Nonstop2h 15mAmerican Airlines
Thu 20/117:35 a.m.ORD - YYZ
1 stop4h 27mAmerican Airlines
Deal found 29/10C$ 265
Fri 14/119:15 a.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Mon 17/114:15 p.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 29/10C$ 265
Sat 6/124:44 p.m.YYZ - ORD
Nonstop2h 00mAmerican Airlines
Tue 9/126:22 a.m.ORD - YYZ
1 stop5h 38mAmerican Airlines
Deal found 28/10C$ 270
Thu 11/129:15 a.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Sun 14/1211:00 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 29/10C$ 270
Fri 5/126:00 a.m.YYZ - ORD
Nonstop2h 15mAmerican Airlines
Sun 7/125:00 a.m.ORD - YYZ
1 stop5h 02mAmerican Airlines
Deal found 29/10C$ 271
Thu 13/117:00 a.m.YYZ - ORD
1 stop5h 18mAir Canada
Sun 16/118:00 a.m.ORD - YYZ
Nonstop1h 40mAir Canada
Deal found 30/10C$ 274
Thu 20/119:15 a.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Mon 24/114:15 p.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 27/10C$ 274

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 30 October 2025.

Round-trip from

C$ 253

One-way from

C$ 176

Popular in

October

Cheapest in

July

Average price

C$ 413

Good round-trip deal

C$ 347 or less

Good one-way deal

C$ 197 or less
Air Canada
  • Air Canada
  • 14/11-17/11
  • 1 total stop
  • 6h 57m total
  • Ontario to Illinois
Search Deals
14/12
  • 14/12
  • 3 total stops
  • 32h 49m total
  • Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 29 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Ontario to Illinois.
Search Deals
Price to beat on a one-way flight from Ontario to Illinois.
Search Deals

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 629,999 searches. Data last updated 30 October 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

YYZ - ORD

YYZORD

Toronto Pearson Intl

Fri 27/2

3:30 p.m.-4:39 p.m.

Nonstop2h 09m

Chicago O'Hare Intl

Sun 1/3

4:47 p.m.-7:45 p.m.

Nonstop1h 58m

C$ 257

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Tue 24/2

8:55 a.m.-10:02 a.m.

Nonstop2h 07m

Chicago O'Hare Intl

Sat 28/2

8:15 p.m.-10:54 p.m.

Nonstop1h 39m

C$ 257

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Fri 9/1

11:00 a.m.-12:08 p.m.

Nonstop2h 08m

Chicago O'Hare Intl

Sat 7/2

9:15 p.m.-11:54 p.m.

Nonstop1h 39m

C$ 257

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 26/2

6:30 p.m.-7:30 p.m.

Nonstop2h 00m

Chicago O'Hare Intl

Sun 1/3

2:00 p.m.-4:39 p.m.

Nonstop1h 39m

C$ 258

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 14/11

9:15 a.m.-10:05 a.m.

Nonstop1h 50m

Chicago Midway

Mon 17/11

4:15 p.m.-6:57 p.m.

Nonstop1h 42m

C$ 265

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 14/11

2:30 p.m.-3:20 p.m.

Nonstop1h 50m

Chicago Midway

Tue 18/11

11:00 a.m.-1:42 p.m.

Nonstop1h 42m

C$ 275

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 24/11

2:30 p.m.-3:20 p.m.

Nonstop1h 50m

Chicago Midway

Mon 1/12

11:00 a.m.-1:42 p.m.

Nonstop1h 42m

C$ 278

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Tue 13/1

9:15 a.m.-10:05 a.m.

Nonstop1h 50m

Chicago Midway

Tue 20/1

11:00 a.m.-1:42 p.m.

Nonstop1h 42m

C$ 278

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 28/11

2:30 p.m.-3:20 p.m.

Nonstop1h 50m

Chicago Midway

Fri 5/12

4:15 p.m.-6:57 p.m.

Nonstop1h 42m

C$ 281

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 4/12

6:24 p.m.-7:24 p.m.

Nonstop2h 00m

Chicago O'Hare Intl

Fri 5/12

9:39 a.m.-12:30 p.m.

Nonstop1h 51m

C$ 282

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/10

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, June is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of C$ 116). Flying from Region of Ontario to Illinois in February is currently the most expensive (average of C$ 265). 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 30 October 2025.

A simple way to save on the total cost of your ticket is to fly from Region of Ontario to Illinois in the evening. If you’re flexible enough to do this you can expect to save up to 26% on your trip compared to booking a flight at noon.

What is the cheapest day to fly from Region of Ontario to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Illinois. Price data was last updated on 20 October 2024.

Travelers seeking maximum savings on their Region of Ontario to Illinois flight should consider departing on Sunday mornings 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.

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 30 October 2025.
Read reviews from past customers who have flown Porter Airlines,United Airlines, andAmerican Airlines from Ontario to Illinois. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
384 reviews
Check prices

Food

7.6

Comfort

8.0

Entertainment

7.0

Crew

8.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
8.0
Very good
384 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Food

7.6

Comfort

8.0

Entertainment

7.0

Crew

8.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,998 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Food

7.6

Comfort

8.0

Entertainment

7.0

Crew

8.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
American Airlines
7.2
Good
11,030 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Food

7.6

Comfort

8.0

Entertainment

7.0

Crew

8.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
WestJet
7.2
Good
3,149 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Food

7.6

Comfort

8.0

Entertainment

7.0

Crew

8.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,376 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Food

7.6

Comfort

8.0

Entertainment

7.0

Crew

8.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

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.

  • How long is the flight from Region of Ontario to Illinois?

    United Airlines, Air Canada, and Porter Airlines can get you from Region of Ontario to Illinois in just under 1h 50m. Your travel time will be generally consistent. The distance between Region of Ontario and Illinois is about 711 km. All flights are typically direct.

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

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as C$ 182. Users have also found prices from C$ 182 and C$ 184 on Porter Airlines and Air Canada, 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, June is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of C$ 116). Flying from Region of Ontario to Illinois in February is currently the most expensive (average of C$ 265). 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 629,999 searches. Data last updated 30 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 198AverageC$ 352FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 264AverageC$ 469FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 283AverageC$ 648FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapestC$ 284AverageC$ 464FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
WestJetCheapestC$ 373AverageC$ 596FlexibilityNo cancel feeOn-time60%
Search WestJet flights

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?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Ontario to Illinois.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ontario to Illinois flexibly with Cheapflights today.

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

Yes, Cheapflights offers price alerts on Ontario to Illinois flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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