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Cheap flights from Ontario to Illinois from C$ 177

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 21/4. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — ORD
5 Apr — 12 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 31 March 2025.

Round-trip from

C$ 285

One-way from

C$ 177

Popular in

December

Cheapest in

April

Average price

C$ 399

Good round-trip deal

C$ 275 or less

Good one-way deal

C$ 171 or less
Porter Airlines
  • Porter Airlines
  • 23/4-30/4
  • Nonstop
  • 3h 32m total
  • Ontario to Illinois
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Porter Airlines
  • Porter Airlines
  • 21/4
  • Nonstop
  • 1h 50m total
  • Ontario to Illinois
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 26 potential increase over avg. RT price).
Search Deals
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 March 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 31 March 2025.

Wed 23/49:30 a.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Wed 30/411:15 a.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 31/3C$ 285
Wed 14/510:00 a.m.YYZ - ORD
Nonstop1h 54mAir Canada
Wed 21/58:25 p.m.ORD - YYZ
Nonstop1h 42mAir Canada
Deal found 30/3C$ 305
Thu 15/58:25 a.m.YTZ - ORD
1 stop7h 22mAir Canada
Thu 22/52:07 p.m.ORD - YTZ
1 stop6h 28mAir Canada
Deal found 30/3C$ 313
Thu 24/47:00 a.m.YYZ - ORD
Nonstop2h 03mMultiple Airlines
Sun 27/47:20 a.m.ORD - YYZ
1 stop5h 19mMultiple Airlines
Deal found 30/3C$ 335
Sat 19/46:20 p.m.YUL - ORD
Nonstop2h 40mAir Canada
Sun 20/41:56 p.m.ORD - YUL
1 stop6h 45mAir Canada
Deal found 29/3C$ 339
Mon 21/410:45 a.m.YUL - MDW
1 stop6h 55mPorter Airlines
Tue 29/45:35 p.m.MDW - YUL
1 stop4h 12mPorter Airlines
Deal found 29/3C$ 344
Wed 14/54:05 p.m.YTZ - MDW
Nonstop1h 49mAir Transat
Wed 21/59:40 a.m.MDW - YTZ
Nonstop1h 42mAir Transat
Deal found 30/3C$ 348
Thu 24/47:00 a.m.YYZ - ORD
Nonstop2h 03mLufthansa
Sun 27/49:02 a.m.ORD - YYZ
Nonstop1h 47mLufthansa
Deal found 30/3C$ 351
Thu 1/53:35 p.m.YTZ - MDW
Nonstop1h 49mMultiple Airlines
Sun 4/59:40 a.m.MDW - YTZ
Nonstop1h 42mMultiple Airlines
Deal found 30/3C$ 355
Tue 22/49:15 a.m.YUL - ORD
Nonstop2h 32mMultiple Airlines
Wed 23/41:56 p.m.ORD - YUL
1 stop6h 45mMultiple Airlines
Deal found 30/3C$ 358
Thu 1/512:00 p.m.YYZ - ORD
Nonstop1h 55mUnited Airlines
Mon 5/52:00 p.m.ORD - YYZ
1 stop5h 23mUnited Airlines
Deal found 30/3C$ 362
Fri 2/58:20 a.m.YUL - ORD
Nonstop2h 32mUnited Airlines
Tue 6/512:45 p.m.ORD - YUL
1 stop4h 40mUnited Airlines
Deal found 30/3C$ 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 31 March 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 23/4

9:30 a.m.-10:20 a.m.

Nonstop1h 50m

Chicago Midway

Wed 30/4

11:15 a.m.-1:57 p.m.

Nonstop1h 42m

C$ 285

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Wed 14/5

10:00 a.m.-10:54 a.m.

Nonstop1h 54m

Chicago O'Hare Intl

Wed 21/5

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

Nonstop1h 42m

C$ 305

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

Thu 15/5

8:25 a.m.-2:47 p.m.

1 stop7h 22m

Chicago O'Hare Intl

Thu 22/5

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

1 stop6h 28m

C$ 313

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 24/4

7:00 a.m.-8:03 a.m.

Nonstop2h 03m

Chicago O'Hare Intl

Sun 27/4

7:20 a.m.-1:39 p.m.

1 stop5h 19m

C$ 335

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Sat 19/4

6:20 p.m.-8:00 p.m.

Nonstop2h 40m

Chicago O'Hare Intl

Sun 20/4

1:56 p.m.-9:41 p.m.

1 stop6h 45m

C$ 339

MontrealChicago

YUL - MDW

YULMDW

Montreal Pierre Elliott Trudeau Intl

Mon 21/4

10:45 a.m.-4:40 p.m.

1 stop6h 55m

Chicago Midway

Tue 29/4

5:35 p.m.-10:47 p.m.

1 stop4h 12m

C$ 344

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Wed 14/5

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

Nonstop1h 49m

Chicago Midway

Wed 21/5

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

Nonstop1h 42m

C$ 348

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 24/4

9:00 a.m.-10:01 a.m.

Nonstop2h 01m

Chicago O'Hare Intl

Sun 27/4

9:02 a.m.-11:49 a.m.

Nonstop1h 47m

C$ 349

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 1/5

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

Nonstop1h 49m

Chicago Midway

Sun 4/5

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

Nonstop1h 42m

C$ 355

MontrealChicago

YUL - ORD

YULORD

Montreal Pierre Elliott Trudeau Intl

Tue 22/4

9:15 a.m.-10:47 a.m.

Nonstop2h 32m

Chicago O'Hare Intl

Wed 23/4

1:56 p.m.-9:41 p.m.

1 stop6h 45m

C$ 358

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/3

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 31 March 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 31 March 2025.

The most flights from CAON to USIL are scheduled on a Sunday (57 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (29 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 31 March 2025.
To help decide which airline to fly from Ontario to Illinois, see what other customers have to say about Alaska Airlines, Delta and Porter Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,818 reviews
Check prices

Food

7.1

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,818 reviews
Alaska Airlines
8.0
Very good
9,818 reviews
Check prices

Food

7.1

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,899 reviews
Alaska Airlines
8.0
Very good
9,818 reviews
Check prices

Food

7.1

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Porter Airlines
7.9
Good
277 reviews
Alaska Airlines
8.0
Very good
9,818 reviews
Check prices

Food

7.1

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
KLM
7.8
Good
1,321 reviews
Alaska Airlines
8.0
Very good
9,818 reviews
Check prices

Food

7.1

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Air Transat
7.8
Good
381 reviews
Alaska Airlines
8.0
Very good
9,818 reviews
Check prices

Food

7.1

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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$ 177. Users have also found prices from C$ 192 and C$ 199 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.
Pearson Intl to Newark flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
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Calgary to Las Vegas flights
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Toronto Island to Las Vegas flights
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Vancouver Intl to Nashville flights
Toronto Island to Midway flights
Toronto Island to Orlando 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 31 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 269AverageC$ 428FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 313AverageC$ 535FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
American AirlinesCheapestC$ 330AverageC$ 540FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapestC$ 342AverageC$ 739FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 460AverageC$ 653FlexibilityNo 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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