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

Departing from Illinois to Region of Ontario will take you 1h 40m. Airlines will cover a distance of 711 km. This flight may include one or multiple stops.

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$ 88 on United Airlines. Other airlines that offer cheap prices include Porter Airlines from C$ 107 and American Airlines from C$ 112 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$ 132+ 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 13 September 2026.

Thu 1/1011:45 a.m. -

Nonstop1h 40m

Sun 4/1010:10 a.m. -

Nonstop1h 50m

Deal found 11/9C$ 297

Tue 27/106:20 p.m. -

Nonstop1h 46m

Thu 29/1010:35 a.m. -

Nonstop2h 05m

Deal found 11/9C$ 297

Mon 26/106:20 p.m. -

Nonstop1h 46m

Mon 2/1110:35 a.m. -

Nonstop2h 05m

Deal found 10/9C$ 298

Tue 3/114:30 p.m. -

Nonstop1h 40m

Sat 7/112:35 p.m. -

Nonstop2h 03m

Deal found 10/9C$ 298

Tue 13/103:20 p.m. -

Nonstop1h 40m

Sat 24/101:45 p.m. -

Nonstop1h 50m

Deal found 11/9C$ 300

Tue 27/1012:20 p.m. -

Nonstop1h 46m

Tue 3/114:35 p.m. -

Nonstop2h 05m

Deal found 12/9C$ 300

Thu 1/103:20 p.m. -

Nonstop1h 40m

Tue 6/1010:10 a.m. -

Nonstop1h 50m

Deal found 11/9C$ 301

Thu 1/109:55 a.m. -

Nonstop1h 45m

Sun 4/108:05 a.m. -

Nonstop1h 55m

Deal found 13/9C$ 301

Fri 16/103:20 p.m. -

Nonstop1h 40m

Tue 20/1010:10 a.m. -

Nonstop1h 50m

Deal found 11/9C$ 302

Thu 22/102:00 p.m. -

Nonstop1h 48m

Sun 25/1010:35 a.m. -

Nonstop2h 05m

Deal found 11/9C$ 302

Tue 27/108:45 a.m. -

Nonstop1h 42m

Tue 3/112:35 p.m. -

Nonstop2h 03m

Deal found 12/9C$ 302

Sat 26/93:20 p.m. -

Nonstop1h 40m

Mon 28/91:45 p.m. -

Nonstop1h 50m

Deal found 12/9C$ 305

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 13 September 2026.

Sun 4/1011:45 a.m. -

Nonstop1h 40m

Wed 7/101:45 p.m. -

Nonstop1h 50m

Deal found 12/9C$ 297

Thu 1/1011:45 a.m. -

Nonstop1h 40m

Sun 4/1010:10 a.m. -

Nonstop1h 50m

Deal found 11/9C$ 336

Tue 13/102:52 p.m. -

Nonstop2h 04m

Thu 15/108:50 a.m. -

Nonstop1h 58m

Deal found 8/9C$ 337

Tue 13/1011:05 a.m. -

1 stop6h 07m

Thu 15/108:05 a.m. -

Nonstop1h 55m

Deal found 8/9C$ 350

Thu 1/1011:45 a.m. -

Nonstop1h 40m

Sun 4/1010:10 a.m. -

Nonstop1h 50m

Deal found 9/9C$ 363

Sun 15/119:30 a.m. -

1 stop3h 00m

Wed 18/116:00 a.m. -

1 stop4h 42m

Deal found 12/9C$ 373

Thu 19/116:00 a.m. -

1 stop7h 33m

Thu 26/116:00 a.m. -

2 stops11h 34m

Deal found 8/9C$ 505

Thu 1/103:20 p.m. -

Nonstop1h 40m

Sun 4/1010:10 a.m. -

Nonstop1h 50m

Deal found 12/9C$ 301

Sat 10/1011:45 a.m. -

Nonstop1h 40m

Sat 17/101:45 p.m. -

Nonstop1h 50m

Deal found 12/9C$ 301

Sat 21/119:21 p.m. -

Nonstop1h 38m

Sun 29/116:45 a.m. -

Nonstop2h 09m

Deal found 12/9C$ 337

Fri 2/107:09 a.m. -

Nonstop1h 45m

Mon 5/1012:25 p.m. -

Nonstop1h 58m

Deal found 12/9C$ 337

Sat 10/105:53 p.m. -

Nonstop1h 51m

Sat 17/107:00 a.m. -

Nonstop2h 00m

Deal found 12/9C$ 337

Fri 20/116:44 p.m. -

1 stop3h 13m

Mon 23/116:00 a.m. -

1 stop4h 42m

Deal found 9/9C$ 373

Tue 29/911:45 a.m. -

Nonstop1h 40m

Sun 4/1010:10 a.m. -

Nonstop1h 50m

Deal found 8/9C$ 319

Fri 6/111:55 p.m. -

Nonstop1h 47m

Mon 9/1110:45 a.m. -

1 stop5h 07m

Deal found 8/9C$ 401

Sat 21/116:17 p.m. -

Nonstop1h 58m

Wed 25/113:35 p.m. -

Nonstop2h 09m

Deal found 12/9C$ 337

Wed 21/109:29 a.m. -

1 stop6h 50m

Sat 24/106:00 a.m. -

1 stop7h 47m

Deal found 13/9C$ 373

Tue 13/103:20 p.m. -

Nonstop1h 40m

Thu 15/101:45 p.m. -

Nonstop1h 50m

Deal found 12/9C$ 322

Sat 12/127:02 a.m. -

Nonstop1h 45m

Sun 13/128:35 a.m. -

Nonstop2h 09m

Deal found 12/9C$ 337

Wed 11/111:31 p.m. -

1 stop8h 26m

Sat 14/116:00 a.m. -

1 stop7h 51m

Deal found 10/9C$ 373

Tue 29/92:00 p.m. -

Nonstop1h 42m

Sun 4/1012:15 p.m. -

Nonstop2h 10m

Deal found 8/9C$ 415

Sat 26/93:20 p.m. -

Nonstop1h 40m

Wed 30/910:10 a.m. -

Nonstop1h 50m

Deal found 12/9C$ 322

Mon 5/102:52 p.m. -

Nonstop2h 04m

Thu 8/108:50 a.m. -

Nonstop1h 58m

Deal found 8/9C$ 337

Wed 25/119:30 a.m. -

1 stop6h 50m

Mon 30/1112:15 p.m. -

1 stop6h 49m

Deal found 13/9C$ 373

Wed 30/911:45 a.m. -

Nonstop1h 40m

Wed 7/101:45 p.m. -

Nonstop1h 50m

Deal found 8/9C$ 325

Thu 26/111:57 p.m. -

Nonstop1h 50m

Sat 28/1110:53 a.m. -

Nonstop2h 04m

Deal found 11/9C$ 338

Fri 9/102:00 p.m. -

Nonstop1h 48m

Mon 12/1010:20 a.m. -

1 stop9h 26m

Deal found 12/9C$ 497

Fri 20/116:44 p.m. -

1 stop3h 13m

Sat 28/1112:15 p.m. -

1 stop6h 49m

Deal found 13/9C$ 373

Wed 21/103:20 p.m. -

Nonstop1h 40m

Sat 24/101:45 p.m. -

Nonstop1h 50m

Deal found 8/9C$ 332

Wed 7/108:05 a.m. -

2 stops15h 15m

Wed 14/106:55 a.m. -

2 stops14h 35m

Deal found 9/9C$ 1,182

Find flight deals from Illinois to Ontario

Round-trip from	C$ 297
One-way from	C$ 132
Popular in	August
Cheapest in	March
Average price	C$ 413
Good round-trip deal	C$ 276 or less
Good one-way deal	C$ 139 or less

Porter Airlines
1/10-4/10
Nonstop
3h 30m total
Illinois to Ontario

Search Deals

Air Canada
2/10-31/12
Nonstop
1h 45m total
Illinois to Ontario

Search Deals

Highest demand for flights based on searches. 5% potential increase in price (C$ 30 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 September 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 - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Wed 23/9

12:16 p.m.-7:00 p.m.

1 stop5h 44m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Sun 27/9

7:05 a.m.-3:15 p.m.

1 stop7h 10m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Fri 6/11

9:48 p.m.-1:43 p.m.

1 stop14h 55m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Thu 15/10

1:55 p.m.-10:56 p.m.

1 stop8h 01m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Thu 29/10

9:00 a.m.-5:49 p.m.

1 stop7h 49m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Thu 8/10

8:29 a.m.-5:19 p.m.

1 stop7h 50m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Fri 2/10

5:00 a.m.-11:43 a.m.

1 stop5h 43m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Sun 11/10

7:00 a.m.-1:36 p.m.

1 stop5h 36m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

ChicagoToronto

ORD Chicago O'Hare Intl - YYZ Toronto Pearson Intl

ORDYYZ

Chicago O'Hare Intl

Tue 13/10

9:35 p.m.-9:19 a.m.

1 stop10h 44m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

ChicagoToronto

MDW Chicago Midway - YYZ Toronto Pearson Intl

MDWYYZ

Chicago Midway

Sat 26/9

9:29 a.m.-3:15 p.m.

1 stop4h 46m

Toronto Pearson Intl

Wed 31/12

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

Nonstop0h 00m

C$ 146

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

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.

MDW-YTZ

ORD-YTZ

ORD-YYZ

STL-YUL

STL-YYZ

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

MDW-YTZ

ORD-YTZ

ORD-YYZ

STL-YUL

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$ 397). Flying from Illinois to Region of Ontario in August is currently the most expensive (average of C$ 510). 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 Saturday, which is when the least amount of flights are scheduled (39 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$ 381 and C$ 610 in November.
The cheapest round-trip price found within the last 5 days was C$ 298 on Air Canada (3 Nov-7 Nov).

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, andAmerican Airlines 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

460 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

460 reviews

Porter Airlines

8.0

Very good

460 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

7.4

Good

10,211 reviews

Porter Airlines

8.0

Very good

460 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

7.1

Good

12,049 reviews

Porter Airlines

8.0

Very good

460 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

11,619 reviews

Porter Airlines

8.0

Very good

460 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 40m. Airlines will cover a distance of 711 km. This flight may include one or multiple stops.
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$ 88 on United Airlines. Other airlines that offer cheap prices include Porter Airlines from C$ 107 and American Airlines from C$ 112 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$ 397). Flying from Illinois to Region of Ontario in August is currently the most expensive (average of C$ 510). 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

Los Angeles to Vancouver Intl flights

LaGuardia to Pierre Elliott Trudeau Intl flights

John F Kennedy Intl to Pearson Intl flights

San Francisco to Vancouver Intl flights

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O'Hare Intl to Pierre Elliott Trudeau Intl flights

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Newark to Calgary flights

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Los Angeles to Calgary flights

Newark to Québec City flights

O'Hare Intl to Calgary flights

Dulles Intl to Toronto Island flights

San Francisco to Calgary flights

Hobby to Pearson Intl flights

Dallas/Fort Worth to Vancouver Intl flights

Portland to Vancouver Intl flights

Seattle to Calgary flights

Fort Lauderdale to Pearson Intl flights

Atlanta to Pearson Intl flights

John F Kennedy Intl to Calgary flights

San Francisco to Pierre Elliott Trudeau Intl flights

Seattle to Pearson Intl flights

Ontario to Vancouver Intl flights

Philadelphia to Pierre Elliott Trudeau Intl flights

Baltimore to Pearson Intl flights

LaGuardia to Vancouver Intl flights

Top 3 airlines flying from Illinois to Ontario

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	CheapestC$ 135	AverageC$ 659	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Air Canada	CheapestC$ 286	AverageC$ 469	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
United Airlines	CheapestC$ 347	AverageC$ 453	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$ 132

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 2/10. 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 13 September 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 13 September 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 13 September 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 13 September 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 13 September 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 13 September 2026.

Last-minute flights from Illinois to OntarioDiscover last-minute flight deals from Illinois to Ontario. Data last updated 13 September 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to Ontario. Data last updated 13 September 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 13 September 2026.

Search for one-way flight options from Illinois to Ontario. Find affordable one-way fares based on user searches. Data last updated 13 September 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 13 September 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 13 September 2026.

The most flights from USIL to CAON are scheduled on a Friday (68 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (39 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$ 381 and C$ 610 in November.The cheapest round-trip price found within the last 5 days was C$ 298 on Air Canada (3 Nov-7 Nov).

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 12 September 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, andAmerican Airlines 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 13 September 2026.

Popular flight searches

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Illinois to Ontario flights

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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 13 September 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 13 September 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 13 September 2026.

Last-minute flights from Illinois to Ontario
Discover last-minute flight deals from Illinois to Ontario. Data last updated 13 September 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 13 September 2026.

Illinois to Region of Ontario flights typically cost between C$ 381 and C$ 610 in November.
The cheapest round-trip price found within the last 5 days was C$ 298 on Air Canada (3 Nov-7 Nov).