Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Ontario to Illinois from C$ 185

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
25 Feb — 4 Mar1
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 20 February 2025.

Round-trip from

C$ 294

One-way from

C$ 186

Popular in

December

Cheapest in

April

Average price

C$ 405

Good round-trip deal

C$ 282 or less

Good one-way deal

C$ 175 or less
Porter Airlines
  • Porter Airlines
  • 19/3-22/3
  • Nonstop
  • 3h 32m total
  • Ontario to Illinois
Search Deals
17/3
  • 17/3
  • 1 total stop
  • 24h 13m 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).
Search Deals
Average for round-trip flights in February 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 20 February 2025.

Sat 24/54:00 p.m.YYZ - ORD
1 stop5h 12mAir Canada
Sat 7/610:40 a.m.ORD - YYZ
1 stop6h 18mAir Canada
Deal found 20/2C$ 290
Thu 20/33:50 p.m.YTZ - MDW
Nonstop1h 50mPorter Airlines
Mon 24/35:35 p.m.MDW - YTZ
Nonstop1h 42mPorter Airlines
Deal found 19/2C$ 290
Sat 24/510:25 a.m.YTZ - ORD
1 stop5h 30mAir Canada
Sat 7/610:40 a.m.ORD - YTZ
1 stop6h 10mAir Canada
Deal found 20/2C$ 290
Thu 13/39:00 p.m.YYZ - ORD
Nonstop2h 06mMultiple Airlines
Thu 10/47:10 a.m.ORD - YYZ
Nonstop1h 48mMultiple Airlines
Deal found 19/2C$ 315
Thu 20/33:50 p.m.YTZ - MDW
Nonstop1h 50mAir Transat
Thu 27/35:35 p.m.MDW - YTZ
Nonstop1h 42mAir Transat
Deal found 18/2C$ 317
Fri 18/49:30 a.m.YTZ - MDW
Nonstop1h 50mMultiple Airlines
Sat 19/412:55 p.m.MDW - YTZ
Nonstop1h 42mMultiple Airlines
Deal found 20/2C$ 347
Sat 12/46:30 a.m.YYZ - MDW
1 stop13h 03mWestJet
Mon 21/41:16 p.m.MDW - YYZ
1 stop21h 18mWestJet
Deal found 20/2C$ 347
Sat 26/412:45 p.m.YYZ - ORD
1 stop4h 59mUnited Airlines
Wed 30/411:15 a.m.ORD - YYZ
1 stop4h 54mUnited Airlines
Deal found 20/2C$ 349
Thu 20/310:20 a.m.YYZ - MDW
1 stop3h 16mDelta
Mon 24/32:55 p.m.MDW - YYZ
1 stop6h 43mDelta
Deal found 19/2C$ 351
Fri 18/49:45 a.m.YYZ - ORD
1 stop7h 23mDelta
Sat 19/45:00 p.m.ORD - YYZ
1 stop4h 55mDelta
Deal found 20/2C$ 359
Sat 15/33:30 p.m.YUL - ORD
1 stop9h 26mMultiple Airlines
Wed 19/35:55 a.m.ORD - YUL
3 stops33h 50mMultiple Airlines
Deal found 19/2C$ 368
Sun 6/46:50 a.m.YUL - MDW
1 stop4h 30mPorter Airlines
Sun 13/411:15 a.m.MDW - YUL
1 stop4h 37mPorter Airlines
Deal found 20/2C$ 368

Find flights from Ontario to Illinois within your budget

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 20 February 2025.

Fly from

Ontario

Fly to

Illinois

Route

Depart

Return

Price

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sat 24/5

4:00 p.m.-8:12 p.m.

1 stop5h 12m

Chicago O'Hare Intl

Sat 7/6

10:40 a.m.-5:58 p.m.

1 stop6h 18m

C$ 290

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Thu 20/3

3:50 p.m.-4:40 p.m.

Nonstop1h 50m

Chicago Midway

Mon 24/3

5:35 p.m.-8:17 p.m.

Nonstop1h 42m

C$ 290

TorontoChicago

YTZ - ORD

YTZORD

Toronto Island

Sat 24/5

10:25 a.m.-2:55 p.m.

1 stop5h 30m

Chicago O'Hare Intl

Sat 7/6

10:40 a.m.-5:50 p.m.

1 stop6h 10m

C$ 290

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Thu 13/3

9:00 p.m.-10:06 p.m.

Nonstop2h 06m

Chicago O'Hare Intl

Thu 10/4

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

Nonstop1h 48m

C$ 315

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Mon 17/3

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

Nonstop1h 50m

Chicago Midway

Thu 20/3

5:35 p.m.-8:17 p.m.

Nonstop1h 42m

C$ 325

TorontoChicago

YYZ - MDW

YYZMDW

Toronto Pearson Intl

Sat 12/4

6:30 a.m.-6:33 p.m.

1 stop13h 03m

Chicago Midway

Sun 20/4

10:20 a.m.-11:34 a.m.

1 stop24h 14m

C$ 347

TorontoChicago

YTZ - MDW

YTZMDW

Toronto Island

Fri 18/4

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

Nonstop1h 50m

Chicago Midway

Sat 19/4

12:55 p.m.-3:37 p.m.

Nonstop1h 42m

C$ 347

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Sat 26/4

12:45 p.m.-4:44 p.m.

1 stop4h 59m

Chicago O'Hare Intl

Wed 30/4

11:15 a.m.-5:09 p.m.

1 stop4h 54m

C$ 349

TorontoChicago

YYZ - MDW

YYZMDW

Toronto Pearson Intl

Thu 20/3

10:20 a.m.-12:36 p.m.

1 stop3h 16m

Chicago Midway

Mon 24/3

2:55 p.m.-10:38 p.m.

1 stop6h 43m

C$ 351

TorontoChicago

YYZ - ORD

YYZORD

Toronto Pearson Intl

Fri 18/4

9:45 a.m.-4:08 p.m.

1 stop7h 23m

Chicago O'Hare Intl

Sat 19/4

5:00 p.m.-10:55 p.m.

1 stop4h 55m

C$ 359

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/2

Showing 1-10 of 60 results
1
2
3
...
6

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.

Travel insights for flights from Ontario to Illinois

Get recent, data-driven insights about flights from Ontario to Illinois including ideal travel times, pricing trends, and more.

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 20 February 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 20 February 2025.

The most flights from CAON to USIL are scheduled on a Thursday (53 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (38 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 20 February 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
9,692 reviews
Check prices

Entertainment

7.1

Boarding

8.2

Food

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
9,692 reviews
Alaska Airlines
8.0
Very good
9,692 reviews
Check prices

Entertainment

7.1

Boarding

8.2

Food

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
8,220 reviews
Alaska Airlines
8.0
Very good
9,692 reviews
Check prices

Entertainment

7.1

Boarding

8.2

Food

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
276 reviews
Alaska Airlines
8.0
Very good
9,692 reviews
Check prices

Entertainment

7.1

Boarding

8.2

Food

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
1,333 reviews
Alaska Airlines
8.0
Very good
9,692 reviews
Check prices

Entertainment

7.1

Boarding

8.2

Food

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
380 reviews
Alaska Airlines
8.0
Very good
9,692 reviews
Check prices

Entertainment

7.1

Boarding

8.2

Food

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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$ 186. Users have also found prices from C$ 192 and C$ 193 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Pearson Intl to Newark flights
Pearson Intl to LaGuardia flights
Pearson Intl to John F Kennedy Intl flights
Pearson Intl to Las Vegas flights
Toronto Island to Newark flights
Vancouver Intl to Las Vegas flights
Pierre Elliott Trudeau Intl to Miami flights
Pearson Intl to Fort Lauderdale flights
Pearson Intl to Miami flights
Pearson Intl to Los Angeles flights
Pierre Elliott Trudeau Intl to Newark flights
Pearson Intl to Orlando flights
Pearson Intl to O'Hare Intl flights
Vancouver Intl to John F Kennedy Intl flights
Vancouver Intl to Los Angeles flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
Pierre Elliott Trudeau Intl to Orlando flights
Vancouver Intl to Newark flights
Vancouver Intl to Honolulu flights
Toronto Island to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Pierre Elliott Trudeau Intl to Las Vegas flights
Pearson Intl to Tampa flights
Pearson Intl to San Francisco flights
Vancouver Intl to San Francisco flights
Pearson Intl to Dallas/Fort Worth flights
Pearson Intl to Boston flights
Toronto Island to Las Vegas flights
Vancouver Intl to Sky Harbor Intl flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Pearson Intl to Nashville flights
Pearson Intl to Dulles Intl flights
Toronto Island to Orlando flights
Pearson Intl to West Palm Beach flights
Pearson Intl to Sky Harbor Intl flights
Vancouver Intl to LaGuardia flights
Pierre Elliott Trudeau Intl to Dallas/Fort Worth flights
Vancouver Intl to Orlando flights
Pearson Intl to Reagan-National flights
Pearson Intl to Atlanta flights
Vancouver Intl to Palm Springs flights
Pearson Intl to Hobby flights
Pearson Intl to Seattle flights
Pearson Intl to George Bush Intcntl flights
Abbotsford to Las Vegas flights
Pearson Intl to Austin flights
Pearson Intl to Fort Myers flights
Halifax to Orlando flights
Québec City to Fort Lauderdale 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 20 February 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 267AverageC$ 416FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 315AverageC$ 584FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 350AverageC$ 771FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapestC$ 354AverageC$ 541FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
WestJetCheapestC$ 450AverageC$ 611FlexibilityNo 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.

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.