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Cheap flights from Ontario to Illinois from C$ 192

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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
29 Aug — 5 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap 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 July 2026.

Wed 9/94:00 p.m.
YYZ
-
ORD
1 stop5h 12m
Air Canada
Wed 16/93:45 p.m.
ORD
-
YYZ
Nonstop1h 45m
Air Canada
Deal found 26/7C$ 289
Mon 31/88:55 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Wed 2/93:20 p.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 29/7C$ 289
Thu 10/96:50 p.m.
YYZ
-
ORD
Nonstop1h 58m
Air Canada
Sun 13/95:35 p.m.
ORD
-
YYZ
Nonstop1h 43m
Air Canada
Deal found 27/7C$ 290
Thu 27/88:55 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Wed 2/911:45 a.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 29/7C$ 290
Fri 28/88:55 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Wed 2/93:20 p.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 30/7C$ 292
Thu 10/912:15 p.m.
YTZ
-
ORD
Nonstop2h 06m
Air Canada
Sun 13/97:25 a.m.
ORD
-
YTZ
Nonstop1h 42m
Air Canada
Deal found 30/7C$ 292
Fri 25/94:00 p.m.
YYZ
-
ORD
Nonstop1h 58m
Air Canada
Mon 28/98:40 p.m.
ORD
-
YYZ
Nonstop1h 46m
Air Canada
Deal found 26/7C$ 293
Sat 29/88:50 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Tue 8/911:45 a.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 30/7C$ 293
Fri 4/97:45 p.m.
YTZ
-
ORD
Nonstop2h 06m
Air Canada
Sun 6/97:25 a.m.
ORD
-
YTZ
Nonstop1h 42m
Air Canada
Deal found 29/7C$ 293
Fri 4/911:00 a.m.
YYZ
-
ORD
Nonstop2h 00m
United Airlines
Wed 9/912:59 p.m.
ORD
-
YYZ
Nonstop1h 47m
United Airlines
Deal found 28/7C$ 294
Wed 2/99:30 a.m.
YTZ
-
ORD
1 stop6h 25m
Air Canada
Sat 12/97:25 a.m.
ORD
-
YTZ
Nonstop1h 42m
Air Canada
Deal found 28/7C$ 294
Wed 2/96:55 p.m.
YYZ
-
ORD
Nonstop1h 57m
Air Canada
Wed 9/99:55 a.m.
ORD
-
YYZ
Nonstop1h 45m
Air Canada
Deal found 28/7C$ 296

Find 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 July 2026.

Round-trip from

C$ 287

One-way from

C$ 192

Popular in

May

Cheapest in

September

Average price

C$ 399

Good round-trip deal

C$ 289 or less

Good one-way deal

C$ 182 or less
United Airlines
  • United Airlines
  • 4/9-8/9
  • Nonstop
  • 3h 44m total
  • Ontario to Illinois
Search Deals
Air Canada
  • Air Canada
  • 5/9
  • Nonstop
  • 1h 57m total
  • Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease (C$ 5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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 July 2026.
Use the filters below to find and compare flights from Ontario to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 24/9

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

Nonstop2h 00m

Chicago O'Hare Intl

Sun 27/9

9:18 p.m.-11:59 p.m.

Nonstop1h 41m

C$ 294

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Wed 23/9

7:00 a.m.-8:00 a.m.

Nonstop2h 00m

Chicago O'Hare Intl

Sun 27/9

3:40 p.m.-9:53 p.m.

1 stop5h 13m

C$ 307
Quickest round-trip

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Wed 9/9

1:45 p.m.-2:35 p.m.

Nonstop1h 50m

Chicago Midway

Sun 13/9

3:20 p.m.-6:00 p.m.

Nonstop1h 40m

C$ 321

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Tue 8/9

1:45 p.m.-2:35 p.m.

Nonstop1h 50m

Chicago Midway

Sun 13/9

3:20 p.m.-6:00 p.m.

Nonstop1h 40m

C$ 321

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 27/8

8:55 a.m.-9:45 a.m.

Nonstop1h 50m

Chicago Midway

Thu 3/9

3:20 p.m.-6:00 p.m.

Nonstop1h 40m

C$ 330

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Wed 2/9

10:15 a.m.-11:21 a.m.

Nonstop2h 06m

Chicago O'Hare Intl

Sun 27/9

8:50 a.m.-2:19 p.m.

1 stop4h 29m

C$ 334

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

Fri 28/8

7:35 p.m.-8:41 p.m.

Nonstop2h 06m

Chicago O'Hare Intl

Thu 3/9

7:25 a.m.-10:07 a.m.

Nonstop1h 42m

C$ 339

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 17/9

8:00 p.m.-12:28 a.m.

1 stop5h 28m

Chicago O'Hare Intl

Sun 20/9

3:40 p.m.-11:18 p.m.

1 stop6h 38m

C$ 339

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Tue 8/9

6:00 a.m.-12:59 p.m.

1 stop7h 59m

Chicago O'Hare Intl

Thu 10/9

7:05 a.m.-11:18 a.m.

1 stop3h 13m

C$ 342

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 28/9

1:45 p.m.-2:35 p.m.

Nonstop1h 50m

Chicago Midway

Thu 1/10

3:20 p.m.-6:00 p.m.

Nonstop1h 40m

C$ 346

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/7

Showing 1-10 of 60 resultsSorted by cheapest first
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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$ 365). Flying from Region of Ontario to Illinois in December is currently the most expensive (average of C$ 449). 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 July 2026.

A simple way to save on the total cost of your ticket is to fly from Region of Ontario to Illinois at noon. If you’re flexible enough to do this you can expect to save up to 15% on your trip compared to booking a flight in the evening.

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 30 July 2026.

The most flights from CAON to USIL are scheduled on a Monday (71 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (38 on average).

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

Airfare is below average for this route at the moment.
Region of Ontario to Illinois flights typically cost between C$ 358 and C$ 541 in September.
The cheapest round-trip price found within the last 5 days was C$ 287 on United Airlines (4 Sep-8 Sep).

How far ahead should I book a flight from Region of Ontario to Illinois?

The best time to book flights from Region of Ontario to Illinois is 87 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 25 July 2026.

Travelers seeking maximum savings on their Region of Ontario to Illinois flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 July 2026.
Read reviews from past customers who have flown Porter Airlines,United Airlines, andWestJet 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
449 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

6.9

Food

7.5

Boarding

8.2

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Porter Airlines
8.0
Very good
449 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

6.9

Food

7.5

Boarding

8.2

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
United Airlines
7.4
Good
10,046 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

6.9

Food

7.5

Boarding

8.2

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
WestJet
7.2
Good
3,416 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

6.9

Food

7.5

Boarding

8.2

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
American Airlines
7.1
Good
11,842 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

6.9

Food

7.5

Boarding

8.2

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Air Canada
7.1
Good
11,406 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Crew

8.6

Overall

8.0

Comfort

8.0

Entertainment

6.9

Food

7.5

Boarding

8.2

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

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, Porter Airlines, and Air Canada 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 Porter Airlines. According to our data, you can fly for as low as C$ 136. Users have also found prices from C$ 157 and C$ 159 on Air Canada and United Airlines, 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$ 365). Flying from Region of Ontario to Illinois in December is currently the most expensive (average of C$ 449). 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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Calgary to Las Vegas flights
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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 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 201AverageC$ 427FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
American AirlinesCheapestC$ 254AverageC$ 423FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 277AverageC$ 647FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 277AverageC$ 597FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 376AverageC$ 484FlexibilityNo 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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