Cheap flights from Toronto Pearson Intl Airport to Illinois from C$ 181

In general, January is the cheapest month to fly from Toronto Pearson Intl Airport to Illinois. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 355. If you don’t want to visit Illinois in January, then you should wait until March to fly from Toronto Pearson Intl Airport, when ticket prices are also cheap, with an average price of C$ 380.

According to our data, Friday is the cheapest day to fly to Illinois from Toronto Pearson Intl Airport. The lowest ticket price found for a Friday departure recently was C$ 696. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Illinois is Tuesday, with ticket prices averaging around C$ 977.

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Toronto Pearson Intl Airport to Illinois during this time can be as low as C$ 732. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are C$ 1,114 on average. Flights to Illinois from Toronto Pearson Intl Airport in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Toronto Pearson Intl to Chicago O'Hare Intl for the best Toronto Pearson Intl - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Toronto Pearson Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around C$ 442 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Toronto Pearson Intl Airport for as low as C$ 320 on momondo.

There are 4 cabin classes available to choose from on Toronto Pearson Intl Airport to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

United Airlines, Delta, and American Airlines are the most popular carriers operating from Toronto Pearson Intl to Illinois

Air Canada, United Airlines and American Airlines are the top three most popular airlines that fly to Illinois from Toronto Pearson Intl Airport according to our data. Air Canada is the first choice among our users, with 63% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 5 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

The number of flights available between Toronto Pearson Intl Airport and Illinois is 58 per day as of September 2026. The most frequent departure time is 1:00p.m., with 46% of daily flights leaving in the afternoon.

The number of flights available between Toronto Pearson Intl Airport and Illinois is 412 per week as of September 2026. The most frequent departure day is Thu, with 17% of weekly flights leaving on this day.