How long is the flight from Illinois to Region of Ontario?

Departing from Illinois to Region of Ontario will take you 1h 41m. Airlines will cover a distance of 716 km. All flights are typically direct.

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

One-way options have recently been found by users for as low as C$ 91 on Porter Airlines. Other airlines that offer cheap prices include American Airlines from C$ 113 and United Airlines from C$ 125 one-way.

In terms of precipitation, rainfall in Region of Ontario ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

If weather is an important factor for your trip to Region of Ontario, 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 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

Can I find deals for flights from Illinois to Ontario that include hotel bookings?

Yes. In addition to deals on Illinois to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Illinois to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Ontario.

Can I find deals for business class flights from Illinois to Ontario?

Yes. Cheapflights offers flight deals from Illinois to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

C$ 133+ Cheap Flights from Illinois to Ontario

Cheap flight deals from Illinois to Ontario

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from Illinois to Ontario
Explore the most affordable flight options available from Illinois to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Wed 11/1112:15 p.m. -

Nonstop1h 45m

Sat 14/114:35 p.m. -

Nonstop2h 05m

Deal found 20/10C$ 295

Wed 18/111:55 p.m. -

Nonstop1h 47m

Fri 20/119:50 a.m. -

1 stop6h 10m

Deal found 21/10C$ 304

Thu 12/116:20 p.m. -

Nonstop1h 45m

Sun 15/114:35 p.m. -

Nonstop2h 05m

Deal found 21/10C$ 305

Thu 3/126:20 p.m. -

Nonstop1h 45m

Wed 9/1210:30 a.m. -

Nonstop2h 05m

Deal found 21/10C$ 307

Thu 3/128:45 a.m. -

Nonstop1h 42m

Sun 6/126:55 p.m. -

Nonstop2h 03m

Deal found 21/10C$ 307

Thu 12/1112:15 p.m. -

Nonstop1h 45m

Mon 16/114:35 p.m. -

Nonstop2h 05m

Deal found 21/10C$ 308

Thu 19/116:20 p.m. -

Nonstop1h 45m

Fri 27/1110:30 a.m. -

Nonstop2h 05m

Deal found 24/10C$ 309

Sat 14/116:20 p.m. -

Nonstop1h 45m

Sun 15/1110:30 a.m. -

Nonstop2h 05m

Deal found 24/10C$ 312

Tue 10/116:20 p.m. -

Nonstop1h 45m

Sun 15/1110:30 a.m. -

Nonstop2h 05m

Deal found 20/10C$ 314

Wed 18/1112:15 p.m. -

Nonstop1h 45m

Fri 20/114:35 p.m. -

Nonstop2h 05m

Deal found 21/10C$ 315

Wed 18/116:20 p.m. -

Nonstop1h 45m

Sun 22/114:35 p.m. -

Nonstop2h 05m

Deal found 21/10C$ 316

Fri 13/1110:15 a.m. -

Nonstop1h 37m

Mon 16/114:30 p.m. -

Nonstop2h 13m

Deal found 23/10C$ 328

Best flights from Illinois to Ontario
Discover carefully curated flight deals from Illinois to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Wed 16/126:20 p.m. -

Nonstop1h 45m

Tue 5/14:35 p.m. -

Nonstop2h 05m

Deal found 24/10C$ 311

Fri 11/126:20 p.m. -

Nonstop1h 45m

Tue 5/14:35 p.m. -

Nonstop2h 05m

Deal found 24/10C$ 377

Thu 4/32:00 p.m. -

Nonstop1h 41m

Sun 7/36:45 a.m. -

1 stop5h 22m

Deal found 23/10C$ 384

Wed 25/116:17 p.m. -

Nonstop1h 58m

Sat 28/116:45 a.m. -

Nonstop2h 09m

Deal found 22/10C$ 388

Sat 21/111:31 p.m. -

1 stop8h 26m

Sun 22/1112:15 p.m. -

1 stop6h 49m

Deal found 22/10C$ 424

Tue 17/1112:15 p.m. -

Nonstop1h 45m

Fri 20/114:35 p.m. -

Nonstop2h 05m

Deal found 20/10C$ 401

Fri 20/111:55 p.m. -

Nonstop1h 47m

Fri 27/116:50 a.m. -

1 stop5h 17m

Deal found 22/10C$ 406

Fri 13/117:03 a.m. -

Nonstop1h 44m

Sun 15/116:45 a.m. -

Nonstop2h 09m

Deal found 23/10C$ 419

Thu 19/1112:15 p.m. -

Nonstop1h 45m

Sat 21/114:35 p.m. -

Nonstop2h 05m

Deal found 20/10C$ 401

Sun 15/118:29 a.m. -

1 stop7h 51m

Wed 18/119:45 a.m. -

1 stop5h 14m

Deal found 23/10C$ 454

Fri 18/126:00 a.m. -

1 stop6h 43m

Tue 22/1210:00 a.m. -

1 stop7h 54m

Deal found 22/10C$ 424

Fri 13/119:30 a.m. -

1 stop3h 00m

Tue 24/1112:15 p.m. -

1 stop6h 49m

Deal found 23/10C$ 454

Sat 21/1112:15 p.m. -

Nonstop1h 45m

Mon 23/114:35 p.m. -

Nonstop2h 05m

Deal found 20/10C$ 434

Thu 4/36:40 p.m. -

Nonstop1h 56m

Sun 7/36:40 p.m. -

1 stop6h 18m

Deal found 23/10C$ 440

Mon 30/117:05 a.m. -

2 stops10h 14m

Fri 4/128:55 p.m. -

2 stops18h 57m

Deal found 20/10C$ 500

Sat 14/112:44 p.m. -

1 stop7h 13m

Mon 16/119:45 a.m. -

1 stop7h 33m

Deal found 20/10C$ 468

Mon 16/116:20 p.m. -

Nonstop1h 45m

Wed 25/1110:30 a.m. -

Nonstop2h 05m

Deal found 20/10C$ 434

Mon 4/16:20 p.m. -

1 stop12h 39m

Sun 10/13:25 p.m. -

1 stop24h 38m

Deal found 22/10C$ 585

Thu 3/128:39 a.m. -

1 stop7h 41m

Sun 6/126:00 a.m. -

1 stop5h 59m

Deal found 20/10C$ 469

Tue 10/113:00 p.m. -

1 stop7h 52m

Thu 12/118:35 a.m. -

Nonstop2h 09m

Deal found 21/10C$ 510

Thu 12/112:44 p.m. -

1 stop7h 13m

Sun 15/119:45 a.m. -

1 stop7h 33m

Deal found 21/10C$ 469

Wed 10/26:20 p.m. -

Nonstop1h 46m

Tue 16/24:35 p.m. -

Nonstop2h 05m

Deal found 24/10C$ 471

Fri 13/116:08 a.m. -

2 stops28h 11m

Mon 16/119:10 a.m. -

3 stops15h 37m

Deal found 19/10C$ 660

Thu 4/31:35 p.m. -

1 stop8h 25m

Sun 7/36:00 a.m. -

1 stop7h 37m

Deal found 20/10C$ 469

Wed 25/116:17 p.m. -

Nonstop1h 58m

Sun 29/116:45 a.m. -

Nonstop2h 09m

Deal found 22/10C$ 521

Thu 3/125:02 p.m. -

2 stops15h 37m

Mon 7/127:10 p.m. -

2 stops17h 23m

Deal found 20/10C$ 660

Fri 13/112:44 p.m. -

1 stop7h 13m

Sun 15/1112:15 p.m. -

1 stop7h 15m

Deal found 20/10C$ 469

Fri 6/1112:15 p.m. -

Nonstop1h 45m

Tue 17/114:35 p.m. -

Nonstop2h 05m

Deal found 20/10C$ 534

Thu 12/1112:20 p.m. -

2 stops20h 19m

Mon 16/114:15 p.m. -

3 stops20h 07m

Deal found 20/10C$ 662

Thu 4/31:00 p.m. -

1 stop5h 07m

Sun 7/36:00 a.m. -

1 stop3h 45m

Deal found 20/10C$ 469

Find flight deals from Illinois to Ontario

Round-trip from	C$ 295
One-way from	C$ 133
Popular in	October
Cheapest in	January
Average price	C$ 466
Good round-trip deal	C$ 290 or less
Good one-way deal	C$ 201 or less

Porter Airlines
11/11-14/11
Nonstop
3h 50m total
Illinois to Ontario

Search Deals

Porter Airlines
27/11-31/12
Nonstop
1h 45m total
Illinois to Ontario

Search Deals

Highest demand for flights based on searches. 5% potential increase in price (C$ 36 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (C$ 8 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in October 2026

Search Deals

Price to beat on a round-trip flight from Illinois to Ontario.

Search Deals

Price to beat on a one-way flight from Illinois to Ontario.

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoToronto

ORD Chicago O'Hare Intl - YTZ Toronto Island

ORDYTZ

Chicago O'Hare Intl

Sat 13/2

1:55 p.m.-7:56 p.m.

1 stop5h 01m

Toronto Island

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 143

ChicagoToronto

ORD Chicago O'Hare Intl - YTZ Toronto Island

ORDYTZ

Chicago O'Hare Intl

Fri 27/11

6:20 p.m.-9:05 p.m.

Nonstop1h 45m

Toronto Island

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 154

ChicagoToronto

ORD Chicago O'Hare Intl - YTZ Toronto Island

ORDYTZ

Chicago O'Hare Intl

Sun 6/12

7:05 a.m.-2:21 p.m.

1 stop6h 16m

Toronto Island

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 155

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Sat 2/1

6:54 a.m.-9:47 a.m.

Nonstop1h 53m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 158

ChicagoToronto

MDW Chicago Midway - YYZ Toronto Pearson Intl

MDWYYZ

Chicago Midway

Wed 21/4

1:00 p.m.-5:22 p.m.

1 stop3h 22m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 171

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Mon 14/12

10:57 a.m.-5:49 p.m.

1 stop5h 52m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 171

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Thu 3/12

2:30 p.m.-11:26 p.m.

1 stop7h 56m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 171

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Mon 29/3

4:40 p.m.-7:34 p.m.

Nonstop1h 54m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 172

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Fri 12/2

7:05 a.m.-9:47 a.m.

Nonstop1h 42m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 172

ChicagoToronto

MDW Chicago Midway - YTZ Toronto Island

MDWYTZ

Chicago Midway

Mon 16/11

6:08 a.m.-12:50 p.m.

2 stops29h 42m

Toronto Island

Wed 31/12

12:00 a.m.-11:00 p.m.

Nonstop0h 00m

C$ 185

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/10

Showing 1-10 of 60 resultsSorted by cheapest first

...

Best time to book a flight from Illinois to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Illinois with our price prediction graph.

ORD-YTZ

ORD-YYZ

MDW-YYZ

MDW-YTZ

ORD-YOW

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 Illinois to Ontario

USIL-CAON

ORD-YTZ

ORD-YYZ

MDW-YYZ

MDW-YTZ

What is the cheapest month to book a flight from Illinois to Region of Ontario?

Currently, February is the cheapest month in which you can book a flight from Illinois to Region of Ontario (average of C$ 413). Flying from Illinois to Region of Ontario in August is currently the most expensive (average of C$ 513). 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 IL to ON?

It’s optimal to fly from Illinois to Region of Ontario in the evening. By choosing this option you can save up to 43% on the cost of your flight, compared to a flight at noon.

Weekly flight availability from Illinois to Region of Ontario

The most flights from USIL to CAON are scheduled on a Friday (68 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (17 on average).

How much does it cost to fly round-trip from Illinois to Region of Ontario?

Airfare is below average for this route at the moment.

Illinois to Region of Ontario flights typically cost between C$ 340 and C$ 645 in December.
The cheapest round-trip price found within the last 5 days was C$ 307 on Air Canada (3 Dec-6 Dec).

How far ahead should I book a flight from Illinois to Region of Ontario?

The best time to book flights from Illinois to Region of Ontario is 71 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from Illinois to Region of Ontario?

Travelers seeking maximum savings on their Illinois to Region of Ontario flight should consider departing on Thursday mornings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ontario

Check out reviews from past customers who have flown with Porter Airlines,United Airlines, andAir Canada from Illinois to Ontario to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Porter Airlines

8.0

Very good

467 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

United Airlines

7.3

Good

10,436 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Air Canada

7.1

Good

11,810 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

American Airlines

7.0

Good

12,191 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Related info for your journey

How long is the flight from Illinois to Region of Ontario?
Departing from Illinois to Region of Ontario will take you 1h 41m. Airlines will cover a distance of 716 km. All flights are typically direct.
What are the cheapest airlines to fly from Illinois to Region of Ontario one-way?
One-way options have recently been found by users for as low as C$ 91 on Porter Airlines. Other airlines that offer cheap prices include American Airlines from C$ 113 and United Airlines from C$ 125 one-way.
Can I find deals for flights from Illinois to Ontario that include hotel bookings?
Yes. In addition to deals on Illinois to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Illinois to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Ontario.
Can I find deals for business class flights from Illinois to Ontario?
Yes. Cheapflights offers flight deals from Illinois to Ontario 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 Illinois to Region of Ontario?
Currently, February is the cheapest month in which you can book a flight from Illinois to Region of Ontario (average of C$ 413). Flying from Illinois to Region of Ontario in August is currently the most expensive (average of C$ 513). 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

Alternative routes

Complete your trip

Direct flights to Canada

Flights by cabin class

Other flight options

Popular flights

Return Flight Options

Top destinations

Alternative routes for Illinois to Ontario

Newark to Toronto Island flights

Newark to Pearson Intl flights

LaGuardia to Pierre Elliott Trudeau Intl flights

John F Kennedy Intl to Pearson Intl flights

Newark to Pierre Elliott Trudeau Intl flights

LaGuardia to Pearson Intl flights

Los Angeles to Vancouver Intl flights

San Francisco to Vancouver Intl flights

John F Kennedy Intl to Vancouver Intl flights

LaGuardia to Toronto Island flights

Newark to Vancouver Intl flights

John F Kennedy Intl to Pierre Elliott Trudeau Intl flights

Reagan-National to Pearson Intl flights

Dallas/Fort Worth to Pearson Intl flights

Dulles Intl to Pearson Intl flights

Los Angeles to Pearson Intl flights

O'Hare Intl to Pearson Intl flights

San Francisco to Pearson Intl flights

O'Hare Intl to Pierre Elliott Trudeau Intl flights

Seattle to Pearson Intl flights

Dulles Intl to Pierre Elliott Trudeau Intl flights

Newark to Calgary flights

Fort Lauderdale to Pierre Elliott Trudeau Intl flights

Reagan-National to Pierre Elliott Trudeau Intl flights

Newark to Québec City flights

John F Kennedy Intl to Toronto Island flights

Los Angeles to Calgary flights

LaGuardia to Vancouver Intl flights

O'Hare Intl to Vancouver Intl flights

Boston to Pearson Intl flights

Newark to Hamilton flights

John F Kennedy Intl to Calgary flights

Dulles Intl to Toronto Island flights

Hobby to Pearson Intl flights

Boston to Pierre Elliott Trudeau Intl flights

Seattle to Vancouver Intl flights

Minneapolis to Vancouver Intl flights

Atlanta to Pearson Intl flights

Boston to Toronto Island flights

O'Hare Intl to Calgary flights

Dallas/Fort Worth to Vancouver Intl flights

Los Angeles to Pierre Elliott Trudeau Intl flights

San Diego to Vancouver Intl flights

Hobby to Vancouver Intl flights

Denver to Vancouver Intl flights

Miami to Pierre Elliott Trudeau Intl flights

George Bush Intcntl to Pearson Intl flights

San Francisco to Calgary flights

O'Hare Intl to Toronto Island flights

George Bush Intcntl to Vancouver Intl flights

Top 3 airlines flying from Illinois to Ontario

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	CheapestC$ 136	AverageC$ 665	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Air Canada	CheapestC$ 289	AverageC$ 448	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
United Airlines	CheapestC$ 351	AverageC$ 446	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Ontario from Illinois today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Illinois to Ontario?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Ontario from Illinois.

Can Cheapflights find flights from Illinois to Ontario with no change fees?

Yes! Cheapflights helps users easily find flights from Illinois to Ontario with no change fees.

Can Cheapflights notify me if prices for flights from Illinois to Ontario become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ontario from Illinois today and book when prices fit your budget.

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Cheap flights from Illinois to Ontario from C$ 133

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 27/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to Ontario

Cheapest flights from Illinois to OntarioExplore the most affordable flight options available from Illinois to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Explore the most affordable flight options available from Illinois to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Best flights from Illinois to OntarioDiscover carefully curated flight deals from Illinois to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Discover carefully curated flight deals from Illinois to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Direct flights from Illinois to OntarioExplore direct flight options from Illinois to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 October 2026.

Explore direct flight options from Illinois to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 October 2026.

Last-minute flights from Illinois to OntarioDiscover last-minute flight deals from Illinois to Ontario. Data last updated 25 October 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to Ontario. Data last updated 25 October 2026 and is based on user searches.

One-way flights from Illinois to OntarioSearch for one-way flight options from Illinois to Ontario. Find affordable one-way fares based on user searches. Data last updated 25 October 2026.

Search for one-way flight options from Illinois to Ontario. Find affordable one-way fares based on user searches. Data last updated 25 October 2026.

Find flight deals from Illinois to Ontario

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to Ontario that are best for you.

Best time to book a flight from Illinois to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Illinois with our price prediction graph.

Cheapflights Insights

What is the cheapest month to book a flight from Illinois to Region of Ontario?

What is the cheapest time of day to fly from IL to ON?

Find hourly flight availability from Illinois to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 25 October 2026.

It’s optimal to fly from Illinois to Region of Ontario in the evening. By choosing this option you can save up to 43% on the cost of your flight, compared to a flight at noon.

Weekly flight availability from Illinois to Region of Ontario

Explore weekly flight availability from Illinois to Ontario. 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 25 October 2026.

The most flights from USIL to CAON are scheduled on a Friday (68 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (17 on average).

How much does it cost to fly round-trip from Illinois to Region of Ontario?

Airfare is below average for this route at the moment.

Illinois to Region of Ontario flights typically cost between C$ 340 and C$ 645 in December.The cheapest round-trip price found within the last 5 days was C$ 307 on Air Canada (3 Dec-6 Dec).

How far ahead should I book a flight from Illinois to Region of Ontario?

The best time to book flights from Illinois to Region of Ontario is 71 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from Illinois to Region of Ontario?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Ontario. Price data was last updated on 24 October 2026.

Travelers seeking maximum savings on their Illinois to Region of Ontario flight should consider departing on Thursday mornings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ontario

Check out reviews from past customers who have flown with Porter Airlines,United Airlines, andAir Canada from Illinois to Ontario to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from Illinois to Region of Ontario?

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

Can I find deals for flights from Illinois to Ontario that include hotel bookings?

How can I find direct flights from Illinois to Ontario?

Can I find deals for business class flights from Illinois to Ontario?

What is the cheapest month to book a flight from Illinois to Region of Ontario?

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 Illinois to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.

Direct flights to Canada

Book a non-stop flight to one of these other cities located in Canada.

Search flights from Illinois to Ontario by cabin class

Find flights from Illinois to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Illinois and Ontario flights

Browse other Illinois and Ontario flight options. Last updated on 25 October 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Find a return flight route from Ontario

Find the right flight back to Illinois after your stay in Ontario

Illinois to Ontario flights

Consider these flights travelling from Illinois to Ontario.

Top 3 airlines flying from Illinois to Ontario

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Cheapest flights from Illinois to Ontario
Explore the most affordable flight options available from Illinois to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 October 2026.

Best flights from Illinois to Ontario
Discover carefully curated flight deals from Illinois to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 25 October 2026.

Direct flights from Illinois to Ontario
Explore direct flight options from Illinois to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 October 2026.

Last-minute flights from Illinois to Ontario
Discover last-minute flight deals from Illinois to Ontario. Data last updated 25 October 2026 and is based on user searches.

One-way flights from Illinois to Ontario
Search for one-way flight options from Illinois to Ontario. Find affordable one-way fares based on user searches. Data last updated 25 October 2026.

Illinois to Region of Ontario flights typically cost between C$ 340 and C$ 645 in December.
The cheapest round-trip price found within the last 5 days was C$ 307 on Air Canada (3 Dec-6 Dec).