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 is the cheapest time of day to fly from YKF to IL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Toronto Region of Waterloo Intl Airport to Illinois as you normally would.

Can I find deals for flights from Region of Waterloo Intl to Illinois that include hotel bookings?

Yes. In addition to deals on Region of Waterloo Intl to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Region of Waterloo Intl to Illinois?

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

Can I find deals for business class flights from Region of Waterloo Intl to Illinois?

Yes. Cheapflights offers flight deals from Region of Waterloo Intl 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$ 200+ Cheap Flights from Toronto Region of Waterloo Intl Airport to Illinois

Cheap flight deals from Region of Waterloo Intl to Illinois

Enter your travel dates to find the best prices.

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One-way

Cheapest flights from Region of Waterloo Intl to Illinois
Explore the most affordable flight options available from Region of Waterloo Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 September 2026.

Sun 18/108:40 p.m. -

1 stop21h 00m

Tue 20/108:01 p.m. -

2 stops22h 49m

Deal found 5/9C$ 716

Thu 15/106:05 a.m. -

1 stop11h 35m

Mon 19/105:30 p.m. -

1 stop20h 30m

Deal found 5/9C$ 736

Thu 15/106:05 a.m. -

1 stop11h 35m

Tue 20/108:01 p.m. -

2 stops22h 49m

Deal found 5/9C$ 742

Sun 18/106:05 a.m. -

1 stop11h 35m

Mon 19/105:30 p.m. -

1 stop20h 30m

Deal found 5/9C$ 749

Thu 15/106:05 a.m. -

1 stop11h 35m

Fri 16/105:30 p.m. -

1 stop20h 30m

Deal found 5/9C$ 756

Wed 14/106:10 a.m. -

2 stops35h 30m

Mon 19/105:30 p.m. -

1 stop20h 30m

Deal found 5/9C$ 760

Wed 14/108:40 p.m. -

1 stop21h 00m

Tue 20/108:01 p.m. -

2 stops22h 49m

Deal found 5/9C$ 767

Fri 16/108:40 p.m. -

2 stops15h 52m

Mon 19/105:30 p.m. -

1 stop20h 30m

Deal found 5/9C$ 829

Thu 15/106:05 a.m. -

1 stop11h 35m

Sun 18/106:00 a.m. -

2 stops36h 50m

Deal found 5/9C$ 861

Fri 16/106:05 a.m. -

1 stop11h 35m

Tue 20/108:01 p.m. -

2 stops22h 49m

Deal found 5/9C$ 952

Find flight deals from Region of Waterloo Intl to Illinois

Round-trip from	C$ 716
One-way from	C$ 200
Popular in	October
Cheapest in	February
Average price	C$ 364

18/10-20/10
3 total stops
43h 49m total
Toronto to Illinois

Search Deals

Air Canada
5/10-31/12
1 total stop
6h 48m total
Toronto to Illinois

Search Deals

Highest demand for flights based on searches. 1% potential increase in price (C$ 8 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 0% potential price decrease (C$ 4 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Toronto Region of Waterloo Intl Airport to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Mon 5/10

2:00 p.m.-7:48 p.m.

1 stop6h 48m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 200

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Sun 11/10

8:40 p.m.-4:40 p.m.

1 stop21h 00m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 346

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Thu 22/10

6:05 a.m.-4:40 p.m.

1 stop11h 35m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 375

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Wed 21/10

8:40 p.m.-6:43 p.m.

3 stops23h 03m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 392

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Wed 30/9

8:40 p.m.-6:43 p.m.

3 stops23h 03m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 462

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Wed 14/10

8:40 p.m.-10:12 a.m.

2 stops14h 32m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 528

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Wed 14/10

8:40 p.m.-4:40 p.m.

1 stop21h 00m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 599

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Sat 28/11

7:00 p.m.-6:35 p.m.

3 stops24h 35m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 605

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Mon 5/10

8:40 p.m.-4:40 p.m.

1 stop21h 00m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 690

TorontoChicago

YKF Toronto Region of Waterloo Intl - ORD Chicago O'Hare Intl

YKFORD

Toronto Region of Waterloo Intl

Thu 8/10

6:05 a.m.-4:40 p.m.

1 stop11h 35m

Chicago O'Hare Intl

Wed 31/12

12:00 a.m.-1:00 a.m.

Nonstop0h 00m

C$ 692

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/9

Showing 1-10 of 22 resultsSorted by cheapest first

Best time to book a flight from Region of Waterloo Intl to Illinois

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

YKF-ORD

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 Toronto Region of Waterloo Intl Airport to Illinois

YKF-USIL

YKF-ORD

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Illinois

Check out reviews from past customers who have flown with Air Canada from Toronto Region of Waterloo Intl Airport to Illinois to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Air Canada

7.1

Good

11,604 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Sylvia,Aug 2026

YYZ - PHL

Our flight from Kelowna was 5 hours delayed. We missed our connection. We were able to get to a hotel by 3:00 a.m. but the breakfast cost us $40. The hotel was good. We were rescheduled for the flight the next night when it was canceled. There were no hotel vouchers available which didn't matter because there were no hotel rooms available. We decided to just drive which was not easy doing a one-way rental to the United States. Worst possible trip I've ever had

Air Canada

7.1

Good

11,604 reviews

Air Canada

7.1

Good

11,604 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Sylvia,Aug 2026

YYZ - PHL

Related info for your journey

Can I find deals for flights from Region of Waterloo Intl to Illinois that include hotel bookings?
Yes. In addition to deals on Region of Waterloo Intl to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Region of Waterloo Intl to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Region of Waterloo Intl to Illinois.
Can I find deals for business class flights from Region of Waterloo Intl to Illinois?
Yes. Cheapflights offers flight deals from Region of Waterloo Intl 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.

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Region of Waterloo Intl to Illinois

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Can Cheapflights find flights from Region of Waterloo Intl to Illinois with no change fees?

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Cheap flights from Toronto Region of Waterloo Intl Airport to Illinois from C$ 200

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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Region of Waterloo Intl to Illinois

Cheapest flights from Region of Waterloo Intl to IllinoisExplore the most affordable flight options available from Region of Waterloo Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 September 2026.

Explore the most affordable flight options available from Region of Waterloo Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 September 2026.

Best flights from Region of Waterloo Intl to IllinoisDiscover carefully curated flight deals from Region of Waterloo Intl to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 9 September 2026.

Discover carefully curated flight deals from Region of Waterloo Intl to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 9 September 2026.

Last-minute flights from Region of Waterloo Intl to IllinoisDiscover last-minute flight deals from Region of Waterloo Intl to Illinois. Data last updated 9 September 2026 and is based on user searches.

Discover last-minute flight deals from Region of Waterloo Intl to Illinois. Data last updated 9 September 2026 and is based on user searches.

One-way flights from Region of Waterloo Intl to IllinoisSearch for one-way flight options from Region of Waterloo Intl to Illinois. Find affordable one-way fares based on user searches. Data last updated 9 September 2026.

Search for one-way flight options from Region of Waterloo Intl to Illinois. Find affordable one-way fares based on user searches. Data last updated 9 September 2026.

Find flight deals from Region of Waterloo Intl to Illinois

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Cheapflights Fare Finder

Use the filters below to find and compare flights from Toronto Region of Waterloo Intl Airport to Illinois that are best for you.

Best time to book a flight from Region of Waterloo Intl to Illinois

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

Cheapflights Insights

Reviews of airlines servicing Illinois

Check out reviews from past customers who have flown with Air Canada from Toronto Region of Waterloo Intl Airport to Illinois to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Can I find deals for flights from Region of Waterloo Intl to Illinois that include hotel bookings?

How can I find direct flights from Region of Waterloo Intl to Illinois?

Can I find deals for business class flights from Region of Waterloo Intl 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 Region of Waterloo Intl 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.

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Search flights from Region of Waterloo Intl to Illinois by cabin class

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Region of Waterloo Intl and Illinois flights

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Why should you use Cheapflights to find cheap flight tickets from Region of Waterloo Intl to Illinois?

Can Cheapflights find flights from Region of Waterloo Intl to Illinois with no change fees?

Can Cheapflights notify me if prices for flights from Region of Waterloo Intl to Illinois become cheaper?

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Cheapest flights from Region of Waterloo Intl to Illinois
Explore the most affordable flight options available from Region of Waterloo Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 September 2026.

Best flights from Region of Waterloo Intl to Illinois
Discover carefully curated flight deals from Region of Waterloo Intl to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 9 September 2026.

Last-minute flights from Region of Waterloo Intl to Illinois
Discover last-minute flight deals from Region of Waterloo Intl to Illinois. Data last updated 9 September 2026 and is based on user searches.

One-way flights from Region of Waterloo Intl to Illinois
Search for one-way flight options from Region of Waterloo Intl to Illinois. Find affordable one-way fares based on user searches. Data last updated 9 September 2026.