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Cheap flights from Ontario to Illinois from C$ 165

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 18/6. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
5 may. — 12 may.1
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 30 abril 2025.

Round-trip from

C$ 244

One-way from

C$ 165

Popular in

December

Cheapest in

March

Average price

C$ 350

Good round-trip deal

C$ 264 or less

Good one-way deal

C$ 151 or less
Porter Airlines
  • Porter Airlines
  • 22/5-26/5
  • Nonstop
  • 3h 31m total
  • Ontario to Illinois
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American Airlines
  • American Airlines
  • 18/6
  • Nonstop
  • 1h 55m total
  • Ontario to Illinois
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Highest demand for flights based on searches. 5% potential increase in price (C$ 27 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 6 potential savings vs. average RT price).
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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.
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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 30 abril 2025.

jue. 22/53:35 p.m.YTZ - MDW
Nonstop1h 49mPorter Airlines
lun. 26/59:40 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 29/4C$ 244
vie. 13/67:55 a.m.YTZ - MDW
Nonstop1h 50mAir Transat
vie. 20/65:50 p.m.MDW - YTZ
Nonstop1h 42mAir Transat
Deal found 29/4C$ 248
vie. 6/67:25 a.m.YTZ - ORD
1 stop4h 59mAir Canada
dom. 8/62:07 p.m.ORD - YTZ
1 stop6h 28mAir Canada
Deal found 28/4C$ 256
dom. 1/64:05 p.m.YTZ - MDW
Nonstop1h 49mMultiple Airlines
lun. 2/65:50 p.m.MDW - YTZ
Nonstop1h 42mMultiple Airlines
Deal found 29/4C$ 263
vie. 30/52:10 p.m.YYZ - ORD
Nonstop1h 55mAir Canada
sáb. 31/58:25 p.m.ORD - YYZ
Nonstop1h 42mAir Canada
Deal found 29/4C$ 266
jue. 22/512:30 p.m.YUL - ORD
Nonstop2h 35mAmerican Airlines
lun. 26/58:24 a.m.ORD - YUL
Nonstop2h 20mAmerican Airlines
Deal found 29/4C$ 321
jue. 29/51:15 p.m.YYZ - ORD
Nonstop1h 55mAmerican Airlines
jue. 5/612:48 p.m.ORD - YYZ
1 stop4h 56mAmerican Airlines
Deal found 29/4C$ 323
vie. 23/56:15 a.m.YUL - ORD
Nonstop2h 44mUnited Airlines
lun. 26/57:19 a.m.ORD - YUL
Nonstop2h 21mUnited Airlines
Deal found 29/4C$ 349
jue. 12/62:10 p.m.YYZ - ORD
Nonstop1h 55mMultiple Airlines
mié. 18/62:16 p.m.ORD - YYZ
1 stop5h 48mMultiple Airlines
Deal found 29/4C$ 354
mar. 27/51:10 p.m.YUL - MDW
1 stop4h 14mPorter Airlines
mar. 3/65:20 p.m.MDW - YUL
1 stop3h 55mPorter Airlines
Deal found 29/4C$ 354
mié. 21/512:30 p.m.YYZ - MDW
1 stop6h 15mDelta
mié. 28/56:25 p.m.MDW - YYZ
1 stop3h 33mDelta
Deal found 29/4C$ 360
mié. 21/59:49 a.m.YYZ - ORD
1 stop3h 52mDelta
vie. 30/57:10 a.m.ORD - YYZ
1 stop6h 50mDelta
Deal found 29/4C$ 365

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 abril 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

jue. 22/5

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

Nonstop1h 49m

Chicago Midway

lun. 26/5

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

Nonstop1h 42m

C$ 244

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

vie. 13/6

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

Nonstop1h 50m

Chicago Midway

vie. 20/6

5:50 p.m.-8:32 p.m.

Nonstop1h 42m

C$ 248

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

vie. 6/6

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

1 stop4h 59m

Chicago O'Hare Intl

dom. 8/6

2:07 p.m.-9:35 p.m.

1 stop6h 28m

C$ 256

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

dom. 1/6

4:05 p.m.-4:54 p.m.

Nonstop1h 49m

Chicago Midway

lun. 2/6

5:50 p.m.-8:32 p.m.

Nonstop1h 42m

C$ 263

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

vie. 30/5

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

Nonstop1h 55m

Chicago O'Hare Intl

sáb. 31/5

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

Nonstop1h 42m

C$ 266

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

jue. 22/5

12:30 p.m.-2:05 p.m.

Nonstop2h 35m

Chicago O'Hare Intl

lun. 26/5

8:24 a.m.-11:44 a.m.

Nonstop2h 20m

C$ 321

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

jue. 29/5

1:15 p.m.-2:10 p.m.

Nonstop1h 55m

Chicago O'Hare Intl

jue. 5/6

12:48 p.m.-6:44 p.m.

1 stop4h 56m

C$ 323

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

vie. 23/5

6:15 a.m.-7:59 a.m.

Nonstop2h 44m

Chicago O'Hare Intl

lun. 26/5

7:19 a.m.-10:40 a.m.

Nonstop2h 21m

C$ 349

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

jue. 12/6

2:45 p.m.-3:50 p.m.

Nonstop2h 05m

Chicago O'Hare Intl

mar. 17/6

2:16 p.m.-9:07 p.m.

1 stop5h 51m

C$ 354

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

mar. 27/5

1:10 p.m.-4:24 p.m.

1 stop4h 14m

Chicago Midway

mar. 3/6

5:20 p.m.-10:15 p.m.

1 stop3h 55m

C$ 354

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/4

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$ 353). 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 abril 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 30 abril 2025.

The most flights from CAON to USIL are scheduled on a Tuesday (57 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (43 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 30 abril 2025.
To help decide which airline to fly from Ontario to Illinois, see what other customers have to say about Delta, 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.
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,929 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Alaska Airlines
8.0
Very good
9,961 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Porter Airlines
8.0
Very good
285 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,334 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air Transat
7.8
Good
385 reviews
Delta
8.0
Very good
7,929 reviews
Check prices

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 American Airlines. According to our data, you can fly for as low as C$ 165. Users have also found prices from C$ 166 and C$ 166 on Porter Airlines 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$ 353). 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.
Toronto Island to Newark flights
Pearson Intl to Newark flights
Pearson Intl to Las Vegas flights
Pearson Intl to John F Kennedy Intl flights
Pearson Intl to LaGuardia flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to Newark flights
Pearson Intl to Los Angeles flights
Pearson Intl to San Francisco flights
Pearson Intl to Fort Lauderdale flights
Pearson Intl to O'Hare Intl flights
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Pierre Elliott Trudeau Intl to Miami flights
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Vancouver Intl to Newark flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
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Pearson Intl to Dallas/Fort Worth flights
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Pearson Intl to Nashville flights
Pearson Intl to Dulles Intl flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Pearson Intl to Reagan-National flights
Pearson Intl to Seattle flights
Pearson Intl to Hobby flights
Vancouver Intl to LaGuardia flights
Pearson Intl to Boston flights
Vancouver Intl to San Francisco flights
Vancouver Intl to O'Hare Intl flights
Pearson Intl to Tampa flights
Vancouver Intl to Honolulu flights
Toronto Island to Boston flights
Pearson Intl to Atlanta flights
Pierre Elliott Trudeau Intl to Orlando flights
Vancouver Intl to Sky Harbor Intl flights
Pearson Intl to George Bush Intcntl flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Vancouver Intl to Seattle flights
Vancouver Intl to San Diego flights
Pearson Intl to Sky Harbor Intl flights
Toronto Island to Dulles Intl flights
Pierre Elliott Trudeau Intl to San Francisco flights
Vancouver Intl to Minneapolis flights
Calgary to Las Vegas flights
Pierre Elliott Trudeau Intl to Boston flights
Calgary to Los Angeles flights
Pearson 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 30 abril 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 260AverageC$ 406FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
American AirlinesCheapestC$ 301AverageC$ 520FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 301AverageC$ 489FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 329AverageC$ 737FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 429AverageC$ 631FlexibilityNo cancel feeOn-time60%
Search WestJet flights

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How does Cheapflights help users find flights from Ontario to Illinois?

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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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