Cheap flights from Chicago O'Hare Intl Airport to Montreal from C$ 117

The cheapest month to fly to Montreal from Chicago O'Hare Intl Airport is in November. Flight prices, which tend to average around C$ 248, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of November, then book flights to Montreal from Chicago O'Hare Intl Airport during October instead. Flights to Montreal in October, while not as cheap as those in November, still average around C$ 277.

Our data shows that Friday is the least expensive day to fly to Montreal. Tickets to fly out on this day can be as low as C$ 255. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Chicago O'Hare Intl Airport to Montreal for around C$ 681.

Our data shows that the cheapest Chicago O'Hare Intl Airport to Montreal flights are usually those with departure times in the afternoon. Our users have found flights to Montreal in the afternoon for as low as C$ 255. Flights in the morning are often more expensive with an average ticket price of C$ 489.

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 C$ 538 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 C$ 328 on momondo.

There are 2 cabin classes available to choose from on Chicago O'Hare Intl to Montreal flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Historically, on average around 18% 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 140 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

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

According to our data, United Airlines has had the least delays on this route over the last 12 months, with about 14% of their flights experiencing any sort of delay.

The number of flights available between Chicago O'Hare Intl Airport and Montreal is 21 per day as of March 2026. The most frequent departure time is 10:00a.m., with 57% of daily flights leaving at noon.

147 flights are operational weekly from Chicago O'Hare Intl Airport to Montreal as of March 2026. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.