How long is the flight from Québec City to Illinois?

Airlines like United Airlines and Porter Airlines fly from Québec City to Illinois in about 4h 50m. The time it takes to get you to your destination can typically vary by up to 3h 04m. Québec City and Illinois are separated by a distance of 1411 km. Both multi-stop and direct flights can be found to your destination and back.

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.

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).

What are the most popular routes from Québec City to Illinois?

When deciding which route to take from Québec City to Illinois consider Québec City - Chicago O'Hare Intl, Québec City - Chicago Midway or Québec City - Lambert-St Louis as they are the most popular.

What are the cheapest flights from Québec City to Illinois?

Looking at all options, your cheapest flight can be booked for C$ 310. While the most popular route (Québec City - Chicago O'Hare Intl) can be booked for C$ 542 on average, our data indicates C$ 676 when flying from Québec City to Illinois.

What are the most reliable airlines from Québec City to Illinois?

No one likes to see their flight delayed. When booking a flight from Québec City to Illinois consider choosing Qatar Airways (82%), Air Canada (75%) or United Airlines (75%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Québec City to Illinois?

When booking a flight from Québec City to Illinois, you may want to consider flying on Air Canada, United Airlines or American Airlines as they are the most popular for this route.

What airport do you fly from for flights from Québec City to Illinois?

Most people fly from Québec City (YQB) if they book a flight from Québec City to Illinois. Québec City is conveniently located just 13.5 km from Québec City’s city centre.

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

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

How can I find direct flights from Québec City to Illinois?

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

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

Yes. Cheapflights offers flight deals from Québec City 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.

C$ 276+ Cheap Flights from Québec City to Illinois

Cheap flight deals from Québec City to Illinois

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from Québec City to Illinois
Explore the most affordable flight options available from Québec City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 August 2026.

Tue 15/92:37 p.m. -

1 stop7h 35m

Sun 20/910:05 a.m. -

Nonstop2h 48m

Deal found 16/8C$ 500

Fri 18/92:27 p.m. -

Nonstop3h 05m

Sun 20/95:18 a.m. -

1 stop5h 26m

Deal found 16/8C$ 509

Wed 21/102:25 p.m. -

Nonstop3h 05m

Sun 25/1010:01 a.m. -

Nonstop2h 43m

Deal found 20/8C$ 521

Tue 15/912:35 p.m. -

2 stops9h 06m

Wed 23/98:45 a.m. -

1 stop4h 10m

Deal found 16/8C$ 528

Wed 14/103:53 p.m. -

1 stop8h 28m

Tue 20/107:30 a.m. -

1 stop6h 38m

Deal found 18/8C$ 531

Tue 15/96:00 a.m. -

1 stop7h 08m

Wed 23/97:05 a.m. -

1 stop7h 03m

Deal found 16/8C$ 532

Thu 17/92:27 p.m. -

Nonstop3h 05m

Sun 20/910:05 a.m. -

Nonstop2h 48m

Deal found 16/8C$ 538

Thu 22/102:25 p.m. -

Nonstop3h 05m

Sun 25/1010:01 a.m. -

Nonstop2h 43m

Deal found 17/8C$ 542

Fri 18/912:35 p.m. -

2 stops9h 06m

Sun 20/98:45 a.m. -

1 stop4h 10m

Deal found 16/8C$ 543

Tue 6/102:25 p.m. -

Nonstop3h 05m

Sun 11/1010:01 a.m. -

Nonstop2h 43m

Deal found 19/8C$ 545

Fri 16/1010:45 a.m. -

1 stop4h 50m

Sat 24/1011:45 a.m. -

2 stops7h 15m

Deal found 18/8C$ 733

Thu 17/96:40 a.m. -

1 stop8h 55m

Sun 20/911:45 a.m. -

1 stop9h 35m

Deal found 16/8C$ 735

Best flights from Québec City to Illinois
Discover carefully curated flight deals from Québec City to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Tue 6/106:00 a.m. -

1 stop7h 54m

Sun 11/106:00 a.m. -

1 stop5h 02m

Deal found 19/8C$ 551

Mon 26/105:45 p.m. -

1 stop7h 16m

Sat 31/107:25 a.m. -

2 stops10h 00m

Deal found 16/8C$ 582

Fri 25/95:35 a.m. -

1 stop5h 40m

Mon 28/99:55 a.m. -

1 stop5h 12m

Deal found 21/8C$ 597

Fri 2/1010:45 a.m. -

1 stop4h 50m

Fri 9/1011:45 a.m. -

1 stop25h 42m

Deal found 18/8C$ 797

Fri 29/16:00 a.m. -

1 stop7h 15m

Tue 30/311:45 a.m. -

1 stop9h 58m

Deal found 16/8C$ 553

Wed 16/96:00 a.m. -

1 stop7h 08m

Fri 18/99:35 p.m. -

1 stop13h 27m

Deal found 16/8C$ 554

Wed 21/104:55 p.m. -

1 stop6h 33m

Sun 25/105:00 a.m. -

1 stop6h 00m

Deal found 20/8C$ 557

Thu 22/103:00 p.m. -

Nonstop2h 55m

Sun 25/109:48 p.m. -

1 stop13h 12m

Deal found 20/8C$ 567

Thu 4/25:45 p.m. -

1 stop6h 57m

Sat 3/43:25 p.m. -

1 stop6h 18m

Deal found 16/8C$ 574

Fri 25/93:10 p.m. -

1 stop24h 25m

Mon 28/911:45 a.m. -

2 stops7h 15m

Deal found 21/8C$ 881

Thu 17/97:45 a.m. -

2 stops7h 50m

Sun 20/911:45 a.m. -

2 stops7h 15m

Deal found 16/8C$ 909

Wed 27/16:00 a.m. -

1 stop9h 35m

Fri 29/111:45 a.m. -

1 stop10h 02m

Deal found 20/8C$ 576

Tue 6/105:45 p.m. -

1 stop18h 15m

Sun 11/1011:45 a.m. -

1 stop9h 35m

Deal found 19/8C$ 962

Wed 14/103:10 p.m. -

1 stop20h 50m

Sat 24/1011:45 a.m. -

2 stops7h 15m

Deal found 18/8C$ 987

Thu 15/103:10 p.m. -

1 stop20h 50m

Sat 24/103:20 p.m. -

1 stop17h 42m

Deal found 17/8C$ 975

Wed 21/106:00 a.m. -

2 stops9h 17m

Fri 23/107:30 a.m. -

1 stop6h 38m

Deal found 18/8C$ 779

Tue 6/103:53 p.m. -

1 stop6h 16m

Wed 7/1012:20 p.m. -

1 stop9h 21m

Deal found 20/8C$ 784

Fri 18/94:55 p.m. -

2 stops20h 08m

Mon 21/96:53 p.m. -

2 stops19h 15m

Deal found 18/8C$ 801

Find flight deals from Québec City to Illinois

Round-trip from	C$ 500
One-way from	C$ 276
Popular in	April
Cheapest in	September
Average price	C$ 655
Good round-trip deal	C$ 680 or less
Good one-way deal	C$ 325 or less

American Airlines
15/9-20/9
1 total stop
10h 23m total
Québec City to Illinois

Search Deals

Air Canada
16/9
1 total stop
5h 00m total
Québec City to Illinois

Search Deals

Highest demand for flights based on searches. 15% potential increase in price (C$ 129 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (C$ 31 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 2026

Search Deals

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

Search Deals

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

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Québec CityChicago

YQB Québec City - ORD Chicago O'Hare Intl

YQBORD

Québec City

Tue 6/10

6:00 a.m.-12:54 p.m.

1 stop7h 54m

Chicago O'Hare Intl

Sun 11/10

6:00 a.m.-12:02 p.m.

1 stop5h 02m

C$ 551

Québec CityChicago

YQB Québec City - ORD Chicago O'Hare Intl

YQBORD

Québec City

Fri 29/1

6:00 a.m.-12:15 p.m.

1 stop7h 15m

Chicago O'Hare Intl

Tue 30/3

11:45 a.m.-10:43 p.m.

1 stop9h 58m

C$ 553

Québec CityChicago

YQB Québec City - ORD Chicago O'Hare Intl

YQBORD

Québec City

Wed 16/9

6:00 a.m.-12:08 p.m.

1 stop7h 08m

Chicago O'Hare Intl

Fri 18/9

9:35 p.m.-12:02 p.m.

1 stop13h 27m

C$ 554

Québec CityChicago

YQB Québec City - ORD Chicago O'Hare Intl

YQBORD

Québec City

Wed 21/10

4:55 p.m.-10:28 p.m.

1 stop6h 33m

Chicago O'Hare Intl

Sun 25/10

5:00 a.m.-12:00 p.m.

1 stop6h 00m

C$ 557

Québec CityChicago

YQB Québec City - ORD Chicago O'Hare Intl

YQBORD

Québec City

Thu 22/10

3:00 p.m.-4:55 p.m.

Nonstop2h 55m

Chicago O'Hare Intl

Sun 25/10

9:48 p.m.-12:00 p.m.

1 stop13h 12m

C$ 567

Québec CityChicago

YQB Québec City - ORD Chicago O'Hare Intl

YQBORD

Québec City

Thu 4/2

5:45 p.m.-11:42 p.m.

1 stop6h 57m

Chicago O'Hare Intl

Sat 3/4

3:25 p.m.-10:43 p.m.

1 stop6h 18m

C$ 574

Québec CityChicago

YQB Québec City - ORD Chicago O'Hare Intl

YQBORD

Québec City

Wed 27/1

6:00 a.m.-2:35 p.m.

1 stop9h 35m

Chicago O'Hare Intl

Fri 29/1

11:45 a.m.-10:47 p.m.

1 stop10h 02m

C$ 576

Québec CityChicago

YQB Québec City - ORD Chicago O'Hare Intl

YQBORD

Québec City

Mon 26/10

5:45 p.m.-12:01 a.m.

1 stop7h 16m

Chicago O'Hare Intl

Sat 31/10

7:25 a.m.-6:25 p.m.

2 stops10h 00m

C$ 582

Quickest round-trip

Québec CityChicago

YQB Québec City - ORD Chicago O'Hare Intl

YQBORD

Québec City

Fri 25/9

5:35 a.m.-10:15 a.m.

1 stop5h 40m

Chicago O'Hare Intl

Mon 28/9

9:55 a.m.-4:07 p.m.

1 stop5h 12m

C$ 597

Québec CitySt. Louis

YQB Québec City - STL Lambert-St Louis

YQBSTL

Québec City

Wed 21/10

6:00 a.m.-2:17 p.m.

2 stops9h 17m

Lambert-St Louis

Fri 23/10

7:30 a.m.-3:08 p.m.

1 stop6h 38m

C$ 779

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/8

Showing 1-10 of 43 resultsSorted by cheapest first

...

Best time to book a flight from Québec City to Illinois

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

YQB-ORD

YQB-MDW

YQB-STL

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 Québec City to Illinois

YQB-USIL

YQB-ORD

YQB-MDW

YQB-STL

What is the cheapest month to book a flight from Québec City to Illinois?

Currently, September is the cheapest month in which you can book a flight from Québec City to Illinois (average of C$ 313). Flying from Québec City to Illinois in March is currently the most expensive (average of C$ 721). 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 YQB to IL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Québec City to Illinois as you normally would.

Weekly flight availability from Québec City to Illinois

The most flights from YQB to USIL are scheduled on a Monday (5 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).

How much does it cost to fly round-trip from Québec City to Illinois?

Airfare is typical for this route at the moment.

Québec City to Illinois flights typically cost between C$ 392 and C$ 584 in September.
The cheapest round-trip price found within the last 5 days was C$ 500 on American Airlines (15 Sep-20 Sep).

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from Québec City to Illinois, such as Porter Airlines,United Airlines, andAmerican Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Porter Airlines

8.0

Very good

457 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Regan,Aug 2026

YYZ - YVR

My first flight with an all female flight crew who were the best ever.

Porter Airlines

8.0

Very good

457 reviews

Porter Airlines

8.0

Very good

457 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Regan,Aug 2026

YYZ - YVR

My first flight with an all female flight crew who were the best ever.

United Airlines

7.4

Good

10,102 reviews

Porter Airlines

8.0

Very good

457 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Regan,Aug 2026

YYZ - YVR

My first flight with an all female flight crew who were the best ever.

American Airlines

7.1

Good

11,976 reviews

Porter Airlines

8.0

Very good

457 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Regan,Aug 2026

YYZ - YVR

My first flight with an all female flight crew who were the best ever.

Air Canada

7.1

Good

11,508 reviews

Porter Airlines

8.0

Very good

457 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Regan,Aug 2026

YYZ - YVR

My first flight with an all female flight crew who were the best ever.

Related info for your journey

What airport do you fly from for flights from Québec City to Illinois?
Most people fly from Québec City (YQB) if they book a flight from Québec City to Illinois. Québec City is conveniently located just 13.5 km from Québec City’s city centre.
How long is the flight from Québec City to Illinois?
Airlines like United Airlines and Porter Airlines fly from Québec City to Illinois in about 4h 50m. The time it takes to get you to your destination can typically vary by up to 3h 04m. Québec City and Illinois are separated by a distance of 1411 km. Both multi-stop and direct flights can be found to your destination and back.
What are the most popular routes from Québec City to Illinois?
When deciding which route to take from Québec City to Illinois consider Québec City - Chicago O'Hare Intl, Québec City - Chicago Midway or Québec City - Lambert-St Louis as they are the most popular.
What are the most reliable airlines from Québec City to Illinois?
No one likes to see their flight delayed. When booking a flight from Québec City to Illinois consider choosing Qatar Airways (82%), Air Canada (75%) or United Airlines (75%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Québec City to Illinois?
Looking at all options, your cheapest flight can be booked for C$ 310. While the most popular route (Québec City - Chicago O'Hare Intl) can be booked for C$ 542 on average, our data indicates C$ 676 when flying from Québec City to Illinois.
Can I find deals for flights from Québec City to Illinois that include hotel bookings?
Yes. In addition to deals on Québec City to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Québec City to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Québec City to Illinois.
Can I find deals for business class flights from Québec City to Illinois?
Yes. Cheapflights offers flight deals from Québec City 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 Québec City to Illinois?
Currently, September is the cheapest month in which you can book a flight from Québec City to Illinois (average of C$ 313). Flying from Québec City to Illinois in March is currently the most expensive (average of C$ 721). 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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Top 2 airlines flying from Québec City to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	CheapestC$ 175	AverageC$ 650	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
United Airlines	CheapestC$ 247	AverageC$ 495	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from Québec City to Illinois?

Cheapflights makes it easy to find Québec City to Illinois flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

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 Illinois from Québec City.

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

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

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

Yes, Cheapflights offers price alerts on Québec City 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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Cheap flights from Québec City to Illinois from C$ 276

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 16/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Québec City to Illinois

Cheapest flights from Québec City to IllinoisExplore the most affordable flight options available from Québec City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 August 2026.

Explore the most affordable flight options available from Québec City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 August 2026.

Best flights from Québec City to IllinoisDiscover carefully curated flight deals from Québec City to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Discover carefully curated flight deals from Québec City to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Direct flights from Québec City to IllinoisExplore direct flight options from Québec City to Illinois based on user searches, and compare prices and availability for your desired travel dates. Data last updated 21 August 2026.

Explore direct flight options from Québec City to Illinois based on user searches, and compare prices and availability for your desired travel dates. Data last updated 21 August 2026.

Last-minute flights from Québec City to IllinoisDiscover last-minute flight deals from Québec City to Illinois. Data last updated 21 August 2026 and is based on user searches.

Discover last-minute flight deals from Québec City to Illinois. Data last updated 21 August 2026 and is based on user searches.

One-way flights from Québec City to IllinoisSearch for one-way flight options from Québec City to Illinois. Find affordable one-way fares based on user searches. Data last updated 21 August 2026.

Search for one-way flight options from Québec City to Illinois. Find affordable one-way fares based on user searches. Data last updated 21 August 2026.

Find flight deals from Québec City to Illinois

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 Québec City to Illinois that are best for you.

Best time to book a flight from Québec City to Illinois

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

Cheapflights Insights

What is the cheapest month to book a flight from Québec City to Illinois?

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

Find hourly flight availability from Québec City 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 21 August 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Québec City to Illinois as you normally would.

Weekly flight availability from Québec City to Illinois

The most flights from YQB to USIL are scheduled on a Monday (5 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).

How much does it cost to fly round-trip from Québec City to Illinois?

Airfare is typical for this route at the moment.

Québec City to Illinois flights typically cost between C$ 392 and C$ 584 in September.The cheapest round-trip price found within the last 5 days was C$ 500 on American Airlines (15 Sep-20 Sep).

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from Québec City to Illinois, such as Porter Airlines,United Airlines, andAmerican Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly from for flights from Québec City to Illinois?

How long is the flight from Québec City to Illinois?

What are the most popular routes from Québec City to Illinois?

What are the most reliable airlines from Québec City to Illinois?

What are the cheapest flights from Québec City to Illinois?

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

How can I find direct flights from Québec City to Illinois?

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

What is the cheapest month to book a flight from Québec City to Illinois?

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 Québec City to Illinois

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

Complete your trip

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

Direct flights to United States

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

Search flights from Québec City to Illinois by cabin class

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

Québec City and Illinois flights

Browse other Québec City and Illinois flight options. Last updated on 21 August 2026.

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Québec City to Illinois flights

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Top 2 airlines flying from Québec City to Illinois

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How does Cheapflights help users find flights from Québec City to Illinois?

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

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

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

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Cheapest flights from Québec City to Illinois
Explore the most affordable flight options available from Québec City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 August 2026.

Best flights from Québec City to Illinois
Discover carefully curated flight deals from Québec City to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Direct flights from Québec City to Illinois
Explore direct flight options from Québec City to Illinois based on user searches, and compare prices and availability for your desired travel dates. Data last updated 21 August 2026.

Last-minute flights from Québec City to Illinois
Discover last-minute flight deals from Québec City to Illinois. Data last updated 21 August 2026 and is based on user searches.

One-way flights from Québec City to Illinois
Search for one-way flight options from Québec City to Illinois. Find affordable one-way fares based on user searches. Data last updated 21 August 2026.

Québec City to Illinois flights typically cost between C$ 392 and C$ 584 in September.
The cheapest round-trip price found within the last 5 days was C$ 500 on American Airlines (15 Sep-20 Sep).