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Cheap flights from Ontario to Illinois from C$ 189

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 29/8. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
14 Jul — 21 Jul1
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 14 June 2026.

Fri 4/96:55 p.m.
YYZ
-
ORD
Nonstop1h 57m
Air Canada
Sun 6/98:40 p.m.
ORD
-
YYZ
Nonstop1h 45m
Air Canada
Deal found 10/6C$ 288
Sun 28/68:50 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Mon 29/63:20 p.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 11/6C$ 288
Thu 2/78:30 a.m.
YTZ
-
ORD
1 stop7h 20m
Air Canada
Sun 5/77:25 a.m.
ORD
-
YTZ
Nonstop1h 42m
Air Canada
Deal found 9/6C$ 288
Fri 2/105:27 p.m.
YYZ
-
ORD
Nonstop2h 03m
United Airlines
Mon 5/108:50 a.m.
ORD
-
YYZ
Nonstop1h 59m
United Airlines
Deal found 9/6C$ 290
Tue 30/68:50 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Sat 4/710:25 a.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 13/6C$ 290
Fri 11/910:05 a.m.
YTZ
-
ORD
Nonstop1h 55m
Porter Airlines
Mon 14/93:20 p.m.
ORD
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 9/6C$ 290
Thu 25/62:00 p.m.
YYZ
-
ORD
Nonstop1h 55m
Air Canada
Sun 28/63:45 p.m.
ORD
-
YYZ
Nonstop1h 46m
Air Canada
Deal found 10/6C$ 291
Sun 26/78:50 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Sun 2/810:20 a.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 11/6C$ 291
Thu 9/78:50 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Wed 15/710:25 a.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 13/6C$ 292
Wed 15/77:25 p.m.
YTZ
-
ORD
Nonstop2h 04m
Air Canada
Wed 22/72:00 p.m.
ORD
-
YTZ
Nonstop1h 42m
Air Canada
Deal found 10/6C$ 292
Sun 12/78:50 a.m.
YTZ
-
MDW
Nonstop1h 50m
Porter Airlines
Thu 30/73:20 p.m.
MDW
-
YTZ
Nonstop1h 40m
Porter Airlines
Deal found 11/6C$ 294
Wed 1/77:25 p.m.
YTZ
-
ORD
Nonstop2h 04m
Air Canada
Sun 5/77:25 a.m.
ORD
-
YTZ
Nonstop1h 42m
Air Canada
Deal found 14/6C$ 294

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 14 June 2026.

Round-trip from

C$ 288

One-way from

C$ 189

Popular in

May

Cheapest in

September

Average price

C$ 392

Good round-trip deal

C$ 300 or less

Good one-way deal

C$ 201 or less
Air Canada
  • Air Canada
  • 4/9-6/9
  • Nonstop
  • 3h 42m total
  • Ontario to Illinois
Search Deals
Air Canada
  • Air Canada
  • 4/9
  • 1 total stop
  • 5h 05m total
  • Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 31 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 June 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 14 June 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

Fri 2/10

5:27 p.m.-6:30 p.m.

Nonstop2h 03m

Chicago O'Hare Intl

Mon 5/10

8:50 a.m.-11:49 a.m.

Nonstop1h 59m

C$ 290
Quickest round-trip

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 14/8

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

Nonstop1h 50m

Chicago Midway

Sun 16/8

10:20 a.m.-1:00 p.m.

Nonstop1h 40m

C$ 291

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Wed 15/7

8:50 a.m.-9:40 a.m.

Nonstop1h 50m

Chicago Midway

Sat 18/7

10:25 a.m.-1:05 p.m.

Nonstop1h 40m

C$ 292

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 10/7

8:50 a.m.-9:40 a.m.

Nonstop1h 50m

Chicago Midway

Sun 12/7

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

Nonstop1h 40m

C$ 292

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

Mon 20/7

7:25 p.m.-8:29 p.m.

Nonstop2h 04m

Chicago O'Hare Intl

Thu 23/7

2:00 p.m.-4:42 p.m.

Nonstop1h 42m

C$ 294

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Sun 12/7

8:50 a.m.-9:40 a.m.

Nonstop1h 50m

Chicago Midway

Thu 30/7

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

Nonstop1h 40m

C$ 294

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Sun 12/7

8:50 a.m.-9:40 a.m.

Nonstop1h 50m

Chicago Midway

Wed 29/7

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

Nonstop1h 40m

C$ 294

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 10/7

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

Nonstop1h 50m

Chicago Midway

Tue 28/7

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

Nonstop1h 40m

C$ 294

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Wed 15/7

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

Nonstop2h 00m

Chicago O'Hare Intl

Sun 19/7

7:09 a.m.-9:54 a.m.

Nonstop1h 45m

C$ 308

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Sat 4/7

8:50 a.m.-9:40 a.m.

Nonstop1h 50m

Chicago Midway

Sat 11/7

10:25 a.m.-1:05 p.m.

Nonstop1h 40m

C$ 311

Flights are sorted by cheapest round-trip flights first.

Deals found on 13/6

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, August is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of C$ 341). Flying from Region of Ontario to Illinois in January is currently the most expensive (average of C$ 1,090). 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 14 June 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 17% 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 14 June 2026.

The most flights from CAON to USIL are scheduled on a Sunday (70 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (57 on average).

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

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 13 June 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 14 June 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
438 reviews
Check prices

Entertainment

6.9

Boarding

8.2

Comfort

8.0

Food

7.6

Overall

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
Porter Airlines
8.0
Very good
438 reviews
Porter Airlines
8.0
Very good
438 reviews
Check prices

Entertainment

6.9

Boarding

8.2

Comfort

8.0

Food

7.6

Overall

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
United Airlines
7.4
Good
9,818 reviews
Porter Airlines
8.0
Very good
438 reviews
Check prices

Entertainment

6.9

Boarding

8.2

Comfort

8.0

Food

7.6

Overall

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
WestJet
7.2
Good
3,360 reviews
Porter Airlines
8.0
Very good
438 reviews
Check prices

Entertainment

6.9

Boarding

8.2

Comfort

8.0

Food

7.6

Overall

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
American Airlines
7.1
Good
11,648 reviews
Porter Airlines
8.0
Very good
438 reviews
Check prices

Entertainment

6.9

Boarding

8.2

Comfort

8.0

Food

7.6

Overall

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
Air Canada
7.1
Good
11,172 reviews
Porter Airlines
8.0
Very good
438 reviews
Check prices

Entertainment

6.9

Boarding

8.2

Comfort

8.0

Food

7.6

Overall

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.

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$ 125. Users have also found prices from C$ 156 and C$ 158 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, August is the cheapest month in which you can book a flight from Region of Ontario to Illinois (average of C$ 341). Flying from Region of Ontario to Illinois in January is currently the most expensive (average of C$ 1,090). 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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Pearson Intl to George Bush Intcntl flights
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Vancouver Intl to O'Hare Intl flights
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Calgary to Las Vegas flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Abbotsford to Los Angeles flights
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Toronto Island to O'Hare Intl flights
Pearson Intl to San Diego flights
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Abbotsford to San Francisco flights
Pearson Intl to Midway flights
Vancouver Intl to Denver flights

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 14 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 115AverageC$ 384FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
American AirlinesCheapestC$ 253AverageC$ 422FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 253AverageC$ 592FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 269AverageC$ 518FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 373AverageC$ 480FlexibilityNo 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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