Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to Illinois from $172

The cheapest month to fly to Illinois from Montreal Pierre Elliott Trudeau Intl Airport is in April. Flight prices, which tend to average around $275, 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 April, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $286.

The cheapest day to depart from Montreal Pierre Elliott Trudeau Intl Airport to Illinois is on a Thursday when prices can be found for as low as $436. Flights from Montreal Pierre Elliott Trudeau Intl Airport to Illinois on a Monday will generally be more expensive and average around $744. 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 at noon. Flights from Montreal Pierre Elliott Trudeau Intl Airport to Illinois during this time can be as low as $493. Flights in the morning are often more expensive with an average ticket price of $536.

Fly from Montreal Pierre Elliott Trudeau Intl to Chicago O'Hare Intl for the best Montreal Pierre Elliott Trudeau Intl - Illinois flight prices

You are more likely to see cheaper flights to Illinois from Montreal Pierre Elliott Trudeau Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $362 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Montreal Pierre Elliott Trudeau Intl Airport for as low as $229 on momondo.

There are 4 cabin classes available to choose from on Montreal Pierre Elliott Trudeau 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 and Delta are the most popular carriers operating from Montreal Pierre Elliott Trudeau Intl to Illinois

Air Canada, United Airlines and American Airlines are the top three most popular airlines that fly to Illinois from Montreal Pierre Elliott Trudeau Intl Airport according to our data. Air Canada is the first choice among our users, with 75% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 3 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

26 flights are operational daily from Montreal Pierre Elliott Trudeau Intl Airport to Illinois as of October 2026. The most popular departure time for this route is 9:00AM, with 54% of flights per day taking off in the afternoon.

The number of flights available between Montreal Pierre Elliott Trudeau Intl Airport and Illinois is 188 per week as of October 2026. The most frequent departure day is Fri, with 18% of weekly flights leaving on this day.