Cheap flights from Alberta to Illinois from $176

The cheapest month to fly to Illinois from Alberta is in February. Flight prices, which tend to average around $262, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of February, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $273.

The cheapest day to depart from Alberta to Illinois is on a Friday when prices can be found for as low as $443. Flights from Alberta to Illinois on a Tuesday will generally be more expensive and average around $625. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

Our most recent data shows that the best time of day to fly to Illinois is in the morning. Flights from Alberta to Illinois during this time can be as low as $382. Flights at noon are often more expensive with an average ticket price of $733.

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 $340 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 $237 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.

Delta and United Airlines are the most popular carriers operating from Alberta to Illinois

WestJet, United Airlines and Air Canada 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 35% of people opting to fly with this airline when traveling 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.

As of November 2026, there are 3 flights per day flying from Alberta to Illinois. The most common time of day flights depart is 1:00PM, with 100% of flights taking off in the afternoon.

22 flights are operational weekly from Alberta to Illinois as of November 2026. The most popular departure day for this route is Mon, with 23% of flights per week taking off on this day.