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Illinois

$106+ Cheap flights from Ontario to Illinois

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 October 30, 2025.

This SmartFares deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/147:00 amYYZ - ORD
1 stop5h 18mAir Canada
Mon 11/178:15 pmORD - YYZ
Nonstop1h 39mAir Canada
Deal found 10/29$181
This Air Canada deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:00 amYYZ - ORD
1 stop5h 18mAir Canada
Thu 2/122:00 pmORD - YYZ
Nonstop1h 39mAir Canada
Deal found 10/29$183
This American Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/264:07 pmYYZ - ORD
1 stop7h 49mAmerican Airlines
Wed 12/38:29 amORD - YYZ
1 stop7h 58mAmerican Airlines
Deal found 10/27$184
This American Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/46:00 amYYZ - ORD
Nonstop2h 15mAmerican Airlines
Sun 12/79:39 amORD - YYZ
Nonstop1h 51mAmerican Airlines
Deal found 10/27$189
This American Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/186:00 amYYZ - ORD
Nonstop2h 15mAmerican Airlines
Thu 11/207:35 amORD - YYZ
1 stop4h 27mAmerican Airlines
Deal found 10/29$190
This American Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:00 amYYZ - ORD
Nonstop2h 15mAmerican Airlines
Sun 12/76:05 amORD - YYZ
1 stop4h 51mAmerican Airlines
Deal found 10/28$193
This Kiwi.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:15 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Sun 12/1411:00 amMDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 10/29$193
This Trip.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:00 amYYZ - ORD
1 stop5h 18mAir Canada
Mon 12/13:55 pmORD - YYZ
Nonstop1h 39mAir Canada
Deal found 10/28$195
This FlightHub deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/52:30 pmYTZ - MDW
Nonstop1h 50mPorter Airlines
Mon 12/84:15 pmMDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 10/28$195
This Trip.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/112:15 pmYYZ - ORD
Nonstop1h 55mAir Canada
Sun 12/148:00 amORD - YYZ
Nonstop1h 40mAir Canada
Deal found 10/29$196
This SmartFares deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/209:15 amYTZ - MDW
Nonstop1h 50mPorter Airlines
Mon 11/244:15 pmMDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 10/27$196
This FlightHub deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/132:30 pmYTZ - MDW
Nonstop1h 50mPorter Airlines
Mon 11/174:15 pmMDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 10/28$197

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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$181
(SmartFares)

One-way from

$106
(lastminute.com)

Popular in

October

Cheapest in

July

Average price

$296

Good round-trip deal

$333 or less

Good one-way deal

$189 or less
Provider with most accurate pricing for Toronto (YTO)-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-Chicago (CHI) flights.
Search Deals
From Ontario to Illinois
Search Deals
One-way flight from Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($15 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 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 2,558,603 searches. Data last updated October 30, 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

Mon 2/2

3:30 pm-4:40 pm

Nonstop2h 10m

Chicago O'Hare Intl

Mon 2/9

6:28 pm-9:21 pm

Nonstop1h 53m

$184

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Tue 2/24

8:55 am-10:02 am

Nonstop2h 07m

Chicago O'Hare Intl

Sat 2/28

8:15 pm-10:54 pm

Nonstop1h 39m

$184

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Fri 2/27

3:30 pm-4:39 pm

Nonstop2h 09m

Chicago O'Hare Intl

Sun 3/1

4:47 pm-7:45 pm

Nonstop1h 58m

$184

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Mon 1/12

9:00 pm-10:05 pm

Nonstop2h 05m

Chicago O'Hare Intl

Tue 2/10

11:15 am-2:01 pm

Nonstop1h 46m

$184

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Tue 2/24

8:55 am-10:02 am

Nonstop2h 07m

Chicago O'Hare Intl

Sat 2/28

6:28 pm-9:21 pm

Nonstop1h 53m

$184

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Fri 1/9

11:00 am-12:08 pm

Nonstop2h 08m

Chicago O'Hare Intl

Sat 2/7

9:15 pm-11:54 pm

Nonstop1h 39m

$184

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 12/11

9:15 am-10:05 am

Nonstop1h 50m

Chicago Midway

Sun 12/14

11:00 am-1:42 pm

Nonstop1h 42m

$196

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 11/13

2:30 pm-3:20 pm

Nonstop1h 50m

Chicago Midway

Mon 11/17

4:15 pm-6:57 pm

Nonstop1h 42m

$197

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 11/24

2:30 pm-3:20 pm

Nonstop1h 50m

Chicago Midway

Mon 12/1

11:00 am-1:42 pm

Nonstop1h 42m

$199

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 11/28

2:30 pm-3:20 pm

Nonstop1h 50m

Chicago Midway

Fri 12/5

4:15 pm-6:57 pm

Nonstop1h 42m

$201

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

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 $83). Flying from Region of Ontario to Illinois in February is currently the most expensive (average of $190). 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 October 30, 2025.

One of the essential ways to save on airfare from Region of Ontario to Illinois is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 28% on airfare.

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 December 16, 2024.

Travelers seeking maximum savings on their Region of Ontario to Illinois flight should consider departing on Tuesday at noon when fares are most often at their lowest. Monday 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 October 30, 2025.
See what other customers who have flown with Porter Airlines, Air Transat, and United Airlines from Ontario to Illinois have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
384 reviews

Food

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.0

Comfort

8.0

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

Food

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.0

Comfort

8.0

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
7.8
Good
469 reviews
Porter Airlines
8.0
Very good
384 reviews

Food

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.0

Comfort

8.0

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
8,999 reviews
Porter Airlines
8.0
Very good
384 reviews

Food

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.0

Comfort

8.0

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

Food

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.0

Comfort

8.0

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
10,375 reviews
Porter Airlines
8.0
Very good
384 reviews

Food

7.6

Boarding

8.2

Overall

8.0

Crew

8.6

Entertainment

7.0

Comfort

8.0

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, Porter Airlines, and Air Transat can get you from Region of Ontario to Illinois in just under 1h 50m. Your travel time will be generally consistent. Airlines will cover a distance of 442 mi. Generally, flights for this route are nonstop.

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

    $106 is the cheapest one-way deal found within the past few days, from Porter Airlines. You may also be able to find cheap deals on Air Canada and Delta, with prices starting from $132 and $133, 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 $83). Flying from Region of Ontario to Illinois in February is currently the most expensive (average of $190). 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 2,558,603 searches. Data last updated October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$147Average$411FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$158Average$327FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$165Average$371FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$196Average$344FlexibilityNo cancel feeOn-time71%
WestJetCheapest$208Average$348FlexibilityNo cancel feeOn-time60%

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