Cheap flights from Quebec to Illinois from C$ 252

In general, April is the cheapest month to fly from Quebec to Illinois. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 398. If you don’t want to visit Illinois in April, then you should wait until January to fly from Quebec, when ticket prices are also cheap, with an average price of C$ 433.

According to our data, Thursday is the cheapest day to fly to Illinois from Quebec. The lowest ticket price found for a Thursday departure recently was C$ 690. 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 Monday, with ticket prices averaging around C$ 1,005.

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Quebec to Illinois during this time can be as low as C$ 745. If you have a flexible travel schedule, then try to avoid flying at noon when prices are C$ 958 on average. Flights to Illinois from Quebec at noon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

You are more likely to see cheaper flights to Illinois from Quebec when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around C$ 517 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Quebec for as low as C$ 322 on momondo.

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

Air Canada, American Airlines, and Delta are the most popular carriers operating from Quebec to Illinois

Air Canada, United Airlines and Porter Airlines are the top three most popular airlines that fly to Illinois from Quebec according to our data. Air Canada is the first choice among our users, with 72% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 4 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

As of October 2026, 30 flights take off from Quebec and land in Illinois each day. The most common flight departure time for this route is 9:00a.m., with 58% of daily flights taking off in the afternoon.

212 flights are operational weekly from Quebec to Illinois as of October 2026. The most popular departure day for this route is Mon, with 18% of flights per week taking off on this day.