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Cheap flights from Ontario to Illinois from C$ 142

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 18/9. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
5 Aug — 12 Aug1
1 adult

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 31 July 2025.

Round-trip from

C$ 204

One-way from

C$ 142

Popular in

December

Cheapest in

June

Average price

C$ 372

Good round-trip deal

C$ 199 or less

Good one-way deal

C$ 128 or less
Air Transat
  • Air Transat
  • 5/9-7/9
  • Nonstop
  • 3h 31m total
  • Ontario to Illinois
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Air Canada
  • Air Canada
  • 18/9
  • Nonstop
  • 1h 54m total
  • Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 40 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 9 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.
Search Deals

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 31 July 2025.

Fri 7/1112:05 p.m.YYZ - ORD
Nonstop1h 56mAir Canada
Sun 9/113:55 p.m.ORD - YYZ
Nonstop1h 39mAir Canada
Deal found 30/7C$ 203
Fri 5/97:30 a.m.YTZ - MDW
Nonstop1h 49mAir Transat
Sun 7/99:15 a.m.MDW - YTZ
Nonstop1h 42mAir Transat
Deal found 28/7C$ 204
Mon 25/87:55 a.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Thu 4/99:35 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 27/7C$ 206
Sat 13/93:25 p.m.YTZ - ORD
1 stop5h 46mAir Canada
Sat 20/93:35 p.m.ORD - YTZ
1 stop4h 59mAir Canada
Deal found 29/7C$ 214
Mon 25/89:00 p.m.YYZ - ORD
Nonstop2h 07mUnited Airlines
Tue 2/99:12 p.m.ORD - YYZ
Nonstop1h 46mUnited Airlines
Deal found 27/7C$ 232
Thu 11/98:20 a.m.YUL - ORD
Nonstop2h 31mAir Canada
Thu 18/98:25 p.m.ORD - YUL
1 stop4h 25mAir Canada
Deal found 28/7C$ 239
Sat 30/85:29 p.m.YUL - ORD
Nonstop2h 36mAmerican Airlines
Mon 1/95:20 a.m.ORD - YUL
1 stop7h 19mAmerican Airlines
Deal found 27/7C$ 240
Tue 19/810:45 a.m.YUL - MDW
1 stop6h 39mPorter Airlines
Fri 5/95:20 p.m.MDW - YUL
1 stop3h 55mPorter Airlines
Deal found 28/7C$ 252
Mon 6/107:15 p.m.YYZ - ORD
1 stop13h 21mAmerican Airlines
Tue 7/1010:05 a.m.ORD - YYZ
1 stop11h 57mAmerican Airlines
Deal found 27/7C$ 262
Thu 25/97:50 a.m.YTZ - MDW
Nonstop1h 49mMultiple Airlines
Mon 29/95:20 p.m.MDW - YTZ
Nonstop1h 42mMultiple Airlines
Deal found 29/7C$ 270
Fri 12/94:12 p.m.YYZ - ORD
1 stop5h 08mDelta
Sun 14/97:10 a.m.ORD - YYZ
1 stop7h 12mDelta
Deal found 30/7C$ 292
Sat 13/912:14 p.m.YYZ - MDW
1 stop7h 21mDelta
Sat 20/96:15 p.m.MDW - YYZ
1 stop3h 41mDelta
Deal found 30/7C$ 292

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 31 July 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 7/11

12:05 p.m.-1:01 p.m.

Nonstop1h 56m

Chicago O'Hare Intl

Sun 9/11

3:55 p.m.-6:34 p.m.

Nonstop1h 39m

C$ 203

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 5/9

7:30 a.m.-8:19 a.m.

Nonstop1h 49m

Chicago Midway

Sun 7/9

9:15 a.m.-11:57 a.m.

Nonstop1h 42m

C$ 204

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 25/8

7:55 a.m.-8:45 a.m.

Nonstop1h 50m

Chicago Midway

Thu 4/9

9:35 a.m.-12:17 p.m.

Nonstop1h 42m

C$ 206

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

Sat 13/9

3:25 p.m.-8:11 p.m.

1 stop5h 46m

Chicago O'Hare Intl

Sat 20/9

3:35 p.m.-9:34 p.m.

1 stop4h 59m

C$ 214

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Mon 25/8

9:00 p.m.-10:07 p.m.

Nonstop2h 07m

Chicago O'Hare Intl

Tue 2/9

9:12 p.m.-11:58 p.m.

Nonstop1h 46m

C$ 232

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Thu 11/9

8:20 a.m.-9:51 a.m.

Nonstop2h 31m

Chicago O'Hare Intl

Thu 18/9

8:25 p.m.-1:50 a.m.

1 stop4h 25m

C$ 239

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Sat 30/8

5:29 p.m.-7:05 p.m.

Nonstop2h 36m

Chicago O'Hare Intl

Mon 1/9

5:20 a.m.-1:39 p.m.

1 stop7h 19m

C$ 240

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Tue 19/8

10:45 a.m.-4:24 p.m.

1 stop6h 39m

Chicago Midway

Fri 5/9

5:20 p.m.-10:15 p.m.

1 stop3h 55m

C$ 252

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Mon 6/10

7:15 p.m.-7:36 a.m.

1 stop13h 21m

Chicago O'Hare Intl

Tue 7/10

10:05 a.m.-11:02 p.m.

1 stop11h 57m

C$ 262

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 25/9

7:50 a.m.-8:39 a.m.

Nonstop1h 49m

Chicago Midway

Mon 29/9

5:20 p.m.-8:02 p.m.

Nonstop1h 42m

C$ 270

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/7

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, January is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of C$ 261). Flying from Region of Ontario to Illinois in March is currently the most expensive (average of C$ 352). 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 31 July 2025.

When flying from Region of Ontario to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 31 July 2025.

The most flights from CAON to USIL are scheduled on a Monday (62 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (35 on average).

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 31 July 2025.
Read reviews from past customers who have flown Porter Airlines,Delta, andAir Transat 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
318 reviews
Check prices

Crew

8.7

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

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
318 reviews
Porter Airlines
8.0
Very good
318 reviews
Check prices

Crew

8.7

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

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
7,980 reviews
Porter Airlines
8.0
Very good
318 reviews
Check prices

Crew

8.7

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

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
318 reviews
Check prices

Crew

8.7

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

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
8,896 reviews
Porter Airlines
8.0
Very good
318 reviews
Check prices

Crew

8.7

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

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
318 reviews
Check prices

Crew

8.7

Boarding

8.2

Comfort

8.0

Overall

8.0

Entertainment

7.0

Food

7.6

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?

    For one-way options, check prices for Air Canada. According to our data, you can fly for as low as C$ 142. Users have also found prices from C$ 142 and C$ 146 on Porter Airlines and Air Transat, 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, January is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of C$ 261). Flying from Region of Ontario to Illinois in March is currently the most expensive (average of C$ 352). 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

Browse thousands of different options on Cheapflights for your next trip

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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 31 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 228AverageC$ 375FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 271AverageC$ 480FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 289AverageC$ 496FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 291AverageC$ 557FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 422AverageC$ 637FlexibilityNo cancel feeOn-time60%
Search WestJet flights

Fly with Cheapflights

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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?

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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