Cheap flights from Alberta to Illinois from C$ 248

In general, February is the cheapest month to fly from Alberta to Illinois. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 359. If you don’t want to visit Illinois in February, then you should wait until May to fly from Alberta, when ticket prices are also cheap, with an average price of C$ 389.

According to our data, Friday is the cheapest day to fly to Illinois from Alberta. The lowest ticket price found for a Friday departure recently was C$ 650. 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 Sunday, with ticket prices averaging around C$ 1,128.

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Alberta to Illinois during this time can be as low as C$ 542. If you have a flexible travel schedule, then try to avoid flying at noon when prices are C$ 1,011 on average. Flights to Illinois from Alberta at noon are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Calgary to Chicago O'Hare Intl for the best Alberta - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Alberta when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around C$ 485 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Alberta for as low as C$ 338 on momondo.

There are 4 cabin classes available to choose from on Alberta 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, Air Canada, and Delta are the most popular carriers operating from Alberta to Illinois

WestJet, Air Canada and United Airlines are the top three most popular airlines that fly to Illinois from Alberta according to our data. WestJet is the first choice among our users, with 42% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 6 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

3 flights are operational daily from Alberta to Illinois as of November 2026. The most popular departure time for this route is 1:00p.m., with 100% of flights per day taking off in the afternoon.

As of November 2026, there are 21 flights per week flying from Alberta to Illinois. The most common day of the week flights depart is Thu, with 24% of flights taking off on this day.