Cheap flights from Chicago O'Hare Intl Airport to Montreal from $149

The cheapest month to fly to Montreal from Chicago O'Hare Intl Airport is in February. Flight prices, which tend to average around $273, are often lower during this time because this is during the off-season. If you are unable to visit Montreal during the month of February, then departing from Chicago O'Hare Intl Airport during the month April is also very affordable. Most momondo users find prices during this month for around $293.

The cheapest day to depart from Chicago O'Hare Intl Airport to Montreal is on a Thursday when prices can be found for as low as $570. Flights from Chicago O'Hare Intl Airport to Montreal on a Sunday will generally be more expensive and average around $833. 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 Montreal is in the morning. Flights from Chicago O'Hare Intl Airport to Montreal during this time can be as low as $614. In the afternoon is when there is more demand to fly to Montreal, so prices are often more expensive at around $755 per ticket.

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

You are more likely to see cheaper flights to Montreal from Chicago O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Montreal for around $390 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Montreal from Chicago O'Hare Intl Airport for as low as $172 on momondo.

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

Porter Airlines, Delta, and United Airlines are the most popular carriers operating from Chicago O'Hare Intl to Montreal

Air Canada, United Airlines and American Airlines are the top three most popular airlines that fly to Montreal from Chicago O'Hare Intl Airport according to our data. Air Canada is the first choice among our users, with 62% of people opting to fly with this airline when traveling to Montreal. Keep in mind that there are 5 different airlines that fly to Montreal on a routine basis, so you have a few additional options to choose from.

Historically, on average around 20% of flights between Chicago and Montreal have experienced a delay on any given week. The average delay length over the past 12 months has been 141 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

Thursday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

According to our data, American Airlines have had the least number of delays on this route over the last 12 months; with about 13% of their flights experiencing any sort of delay.

26 flights are operational daily from Chicago O'Hare Intl Airport to Montreal as of September 2026. The most popular departure time for this route is 2:00PM, with 57% of flights per day taking off in the afternoon.

The number of flights available between Chicago O'Hare Intl Airport and Montreal is 187 per week as of September 2026. The most frequent departure day is Fri, with 17% of weekly flights leaving on this day.