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Cheap flights from Ontario to Illinois from C$ 141

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 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
22 Apr — 29 Apr1
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 17 April 2025.

Round-trip from

C$ 270

One-way from

C$ 171

Popular in

December

Cheapest in

April

Average price

C$ 345

Good round-trip deal

C$ 266 or less

Good one-way deal

C$ 165 or less
Porter Airlines
  • Porter Airlines
  • 10/5-5/9
  • Nonstop
  • 3h 32m total
  • Ontario to Illinois
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Porter Airlines
  • Porter Airlines
  • 6/5
  • Nonstop
  • 1h 50m total
  • Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 25 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 April 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 17 April 2025.

Sat 10/57:55 a.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Fri 5/99:15 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 17/4C$ 270
Sun 1/62:10 p.m.YYZ - ORD
Nonstop1h 55mAir Canada
Sun 8/610:00 a.m.ORD - YYZ
Nonstop1h 42mAir Canada
Deal found 17/4C$ 279
Thu 22/59:00 p.m.YYZ - ORD
Nonstop2h 05mMultiple Airlines
Mon 26/58:25 p.m.ORD - YYZ
Nonstop1h 42mMultiple Airlines
Deal found 17/4C$ 283
Thu 22/57:25 a.m.YTZ - ORD
1 stop4h 59mAir Canada
Thu 29/52:16 p.m.ORD - YTZ
1 stop5h 21mAir Canada
Deal found 17/4C$ 290
Sat 10/57:55 a.m.YYZ - ORD
Nonstop1h 55mUnited Airlines
Fri 5/99:12 p.m.ORD - YYZ
Nonstop1h 46mUnited Airlines
Deal found 17/4C$ 298
Sat 31/57:55 a.m.YTZ - MDW
Nonstop1h 50mMultiple Airlines
Sat 7/69:40 a.m.MDW - YTZ
Nonstop1h 42mMultiple Airlines
Deal found 16/4C$ 302
Tue 6/53:35 p.m.YTZ - MDW
Nonstop1h 49mAir Transat
Wed 14/59:40 a.m.MDW - YTZ
Nonstop1h 42mAir Transat
Deal found 16/4C$ 305
Sat 21/68:15 a.m.YUL - ORD
2 stops7h 49mAir Canada
Tue 24/66:30 p.m.ORD - YUL
1 stop5h 11mAir Canada
Deal found 16/4C$ 319
Sat 31/59:49 a.m.YYZ - MDW
1 stop3h 39mDelta
Sat 7/65:25 p.m.MDW - YYZ
1 stop4h 33mDelta
Deal found 16/4C$ 326
Tue 6/56:08 p.m.YYZ - ORD
1 stop3h 37mDelta
Sun 11/56:24 a.m.ORD - YYZ
1 stop4h 16mDelta
Deal found 17/4C$ 327
Sun 18/58:55 a.m.YUL - MDW
1 stop8h 59mPorter Airlines
Sun 25/59:40 a.m.MDW - YUL
1 stop5h 20mPorter Airlines
Deal found 16/4C$ 329
Sat 21/66:15 a.m.YUL - ORD
Nonstop2h 44mMultiple Airlines
Tue 24/62:16 p.m.ORD - YUL
1 stop6h 30mMultiple Airlines
Deal found 16/4C$ 340

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 17 April 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

Sat 10/5

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

Nonstop1h 50m

Chicago Midway

Fri 5/9

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

Nonstop1h 42m

C$ 270

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sun 1/6

2:10 p.m.-3:05 p.m.

Nonstop1h 55m

Chicago O'Hare Intl

Sun 8/6

10:00 a.m.-12:42 p.m.

Nonstop1h 42m

C$ 279

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 22/5

9:00 p.m.-10:05 p.m.

Nonstop2h 05m

Chicago O'Hare Intl

Mon 26/5

8:25 p.m.-11:07 p.m.

Nonstop1h 42m

C$ 283

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

Thu 22/5

7:25 a.m.-11:24 a.m.

1 stop4h 59m

Chicago O'Hare Intl

Thu 29/5

2:16 p.m.-8:37 p.m.

1 stop5h 21m

C$ 290

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sat 10/5

7:55 a.m.-8:50 a.m.

Nonstop1h 55m

Chicago O'Hare Intl

Fri 5/9

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

Nonstop1h 46m

C$ 298

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Sat 31/5

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

Nonstop1h 50m

Chicago Midway

Sat 7/6

9:40 a.m.-12:22 p.m.

Nonstop1h 42m

C$ 302

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Tue 6/5

3:35 p.m.-4:24 p.m.

Nonstop1h 49m

Chicago Midway

Wed 14/5

9:40 a.m.-12:22 p.m.

Nonstop1h 42m

C$ 305

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Sat 31/5

8:00 a.m.-12:55 p.m.

1 stop5h 55m

Chicago O'Hare Intl

Sat 7/6

3:50 p.m.-9:40 p.m.

1 stop4h 50m

C$ 319

TorontoChicago

YYZ - MDW

YYZMDW

Toronto Pearson Intl

Sat 31/5

12:15 p.m.-4:21 p.m.

1 stop5h 06m

Chicago Midway

Sat 7/6

5:25 p.m.-10:58 p.m.

1 stop4h 33m

C$ 326

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Tue 6/5

6:08 p.m.-8:45 p.m.

1 stop3h 37m

Chicago O'Hare Intl

Sun 11/5

6:24 a.m.-11:40 a.m.

1 stop4h 16m

C$ 327

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/4

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$ 355). 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 17 April 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 17 April 2025.

The most flights from CAON to USIL are scheduled on a Thursday (57 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (44 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 mm per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

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 17 April 2025.
To help decide which airline to fly from Ontario to Illinois, see what other customers have to say about ANA, Alaska Airlines and Porter Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
ANA
8.3
Very good
845 reviews
Check prices

Boarding

8.5

Comfort

8.1

Overall

8.3

Food

7.6

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
ANA
8.3
Very good
845 reviews
ANA
8.3
Very good
845 reviews
Check prices

Boarding

8.5

Comfort

8.1

Overall

8.3

Food

7.6

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Alaska Airlines
8.0
Very good
9,887 reviews
ANA
8.3
Very good
845 reviews
Check prices

Boarding

8.5

Comfort

8.1

Overall

8.3

Food

7.6

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Porter Airlines
8.0
Very good
281 reviews
ANA
8.3
Very good
845 reviews
Check prices

Boarding

8.5

Comfort

8.1

Overall

8.3

Food

7.6

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Delta
8.0
Very good
7,916 reviews
ANA
8.3
Very good
845 reviews
Check prices

Boarding

8.5

Comfort

8.1

Overall

8.3

Food

7.6

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Air Transat
7.8
Good
385 reviews
ANA
8.3
Very good
845 reviews
Check prices

Boarding

8.5

Comfort

8.1

Overall

8.3

Food

7.6

Crew

8.7

Entertainment

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.

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 Porter Airlines. According to our data, you can fly for as low as C$ 171. Users have also found prices from C$ 172 and C$ 177 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$ 261). Flying from Region of Ontario to Illinois in March is currently the most expensive (average of C$ 355). 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 17 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 261AverageC$ 410FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 302AverageC$ 517FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 319AverageC$ 522FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 331AverageC$ 746FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 429AverageC$ 632FlexibilityNo 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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