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Cheap flights from Ontario to Illinois from C$ 154

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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
11 Oct — 18 Oct1
1 adult
1 adult, Economy

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 11 September 2025.

Round-trip from

C$ 238

One-way from

C$ 154

Popular in

December

Cheapest in

July

Average price

C$ 346

Good round-trip deal

C$ 243 or less

Good one-way deal

C$ 226 or less
Porter Airlines
  • Porter Airlines
  • 24/10-27/10
  • Nonstop
  • 3h 31m total
  • Ontario to Illinois
Search Deals
Porter Airlines
  • Porter Airlines
  • 9/11
  • Nonstop
  • 1h 50m total
  • Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 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

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 11 September 2025.

Fri 24/107:50 a.m.YTZ - MDW
Nonstop1h 49mPorter Airlines
Mon 27/1011:00 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 10/9C$ 238
Wed 15/107:50 a.m.YTZ - MDW
Nonstop1h 49mPorter Airlines
Wed 15/105:20 p.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 10/9C$ 240
Tue 30/93:35 p.m.YTZ - MDW
Nonstop1h 49mPorter Airlines
Tue 7/109:35 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 9/9C$ 247
Fri 3/103:35 p.m.YTZ - MDW
Nonstop1h 49mPorter Airlines
Sun 5/109:35 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 9/9C$ 248
Wed 22/104:40 p.m.YYZ - ORD
Nonstop1h 53mAir Canada
Sat 1/118:00 a.m.ORD - YYZ
Nonstop1h 40mAir Canada
Deal found 9/9C$ 256
Fri 3/107:50 a.m.YTZ - MDW
Nonstop1h 49mAir Transat
Mon 6/109:35 a.m.MDW - YTZ
Nonstop1h 42mAir Transat
Deal found 9/9C$ 256
Sun 23/116:50 a.m.YYZ - ORD
Nonstop2h 05mUnited Airlines
Sun 30/117:10 a.m.ORD - YYZ
Nonstop1h 48mUnited Airlines
Deal found 9/9C$ 258
Mon 27/102:30 p.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Mon 3/114:15 p.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 9/9C$ 261
Sun 23/116:20 a.m.YYZ - ORD
1 stop5h 58mAir Canada
Fri 28/113:55 p.m.ORD - YYZ
Nonstop1h 39mAir Canada
Deal found 9/9C$ 265
Sat 25/106:15 a.m.YYZ - ORD
1 stop4h 36mAir Canada
Sat 1/118:00 a.m.ORD - YYZ
Nonstop1h 40mAir Canada
Deal found 10/9C$ 266
Thu 23/106:15 a.m.YYZ - ORD
1 stop4h 36mAir Canada
Sat 25/103:35 p.m.ORD - YYZ
1 stop5h 04mAir Canada
Deal found 10/9C$ 270
Sun 23/112:15 p.m.YYZ - ORD
Nonstop1h 55mAir Canada
Sat 29/117:15 a.m.ORD - YYZ
2 stops7h 10mAir Canada
Deal found 9/9C$ 272

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 11 September 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

Wed 15/10

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

Nonstop1h 49m

Chicago Midway

Wed 15/10

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

Nonstop1h 42m

C$ 240

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Tue 7/10

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

Nonstop1h 49m

Chicago Midway

Tue 14/10

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

Nonstop1h 42m

C$ 256

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Tue 25/11

11:00 a.m.-12:05 p.m.

Nonstop2h 05m

Chicago O'Hare Intl

Sun 30/11

7:10 a.m.-9:58 a.m.

Nonstop1h 48m

C$ 258

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Mon 24/11

6:50 a.m.-7:56 a.m.

Nonstop2h 06m

Chicago O'Hare Intl

Sun 30/11

7:10 a.m.-9:58 a.m.

Nonstop1h 48m

C$ 258

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sun 23/11

6:50 a.m.-7:55 a.m.

Nonstop2h 05m

Chicago O'Hare Intl

Sun 30/11

7:10 a.m.-9:58 a.m.

Nonstop1h 48m

C$ 258

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sat 25/10

7:00 a.m.-7:58 a.m.

Nonstop1h 58m

Chicago O'Hare Intl

Sun 2/11

7:10 a.m.-9:58 a.m.

Nonstop1h 48m

C$ 258

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 27/10

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

Nonstop1h 50m

Chicago Midway

Mon 3/11

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

Nonstop1h 42m

C$ 261

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 14/11

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

Nonstop1h 50m

Chicago Midway

Sun 16/11

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

Nonstop1h 42m

C$ 273

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 4/12

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

Nonstop1h 50m

Chicago Midway

Mon 8/12

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

Nonstop1h 42m

C$ 280

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Sun 26/10

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

Nonstop1h 50m

Chicago Midway

Thu 30/10

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

Nonstop1h 42m

C$ 281

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

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$ 349). 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 11 September 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 11 September 2025.

The most flights from CAON to USIL are scheduled on a Friday (61 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (41 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 11 September 2025.
Read reviews from past customers who have flown Porter Airlines,Air Transat, andUnited 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
7.9
Good
363 reviews
Check prices

Crew

8.6

Overall

7.9

Entertainment

7.0

Comfort

7.9

Food

7.6

Boarding

8.1

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
7.9
Good
363 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Crew

8.6

Overall

7.9

Entertainment

7.0

Comfort

7.9

Food

7.6

Boarding

8.1

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 Transat
7.7
Good
438 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Crew

8.6

Overall

7.9

Entertainment

7.0

Comfort

7.9

Food

7.6

Boarding

8.1

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
8,937 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Crew

8.6

Overall

7.9

Entertainment

7.0

Comfort

7.9

Food

7.6

Boarding

8.1

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
10,000 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Crew

8.6

Overall

7.9

Entertainment

7.0

Comfort

7.9

Food

7.6

Boarding

8.1

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
10,000 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Crew

8.6

Overall

7.9

Entertainment

7.0

Comfort

7.9

Food

7.6

Boarding

8.1

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?

    Porter Airlines, Air Transat, and United Airlines can get you from Region of Ontario to Illinois in just under 1h 49m. 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$ 154. Users have also found prices from C$ 155 and C$ 159 on Air Transat 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, 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$ 349). 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 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 196AverageC$ 362FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 265AverageC$ 478FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 268AverageC$ 490FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 278AverageC$ 553FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 383AverageC$ 633FlexibilityNo 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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