Cheap flights from Chicago O'Hare Intl Airport to Montreal from C$ 203

The cheapest month to fly to Montreal from Chicago O'Hare Intl Airport is in February. Flight prices, which tend to average around C$ 382, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Montreal from Chicago O'Hare Intl Airport during April instead. Flights to Montreal in April, while not as cheap as those in February, still average around C$ 405.

Our data shows that Tuesday is the least expensive day to fly to Montreal. Tickets to fly out on this day can be as low as C$ 267. When flying out on a Saturday, 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$ 564.

Our data shows that the cheapest Chicago O'Hare Intl Airport to Montreal flights are usually those with departure times at noon. Our users have found flights to Montreal at noon for as low as C$ 226. Flights in the morning are often more expensive with an average ticket price of C$ 490.

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$ 240 on momondo.

There are 2 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.

You could potentially save up to 7% on your flight if you consider stops on a Chicago O'Hare Intl Airport to Montreal flight.

As of August 2026, prices for Chicago O'Hare Intl Airport to Montreal flights are approximately 24% cheaper when compared to flights at the same time last year.

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 142 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing at night 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. Sunday has historically seen more delays on average compared to the rest of the week.

According to our data, American 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 27 per day as of August 2026. The most frequent departure time is 2:00p.m., with 62% of daily flights leaving in the afternoon.

190 flights are operational weekly from Chicago O'Hare Intl Airport to Montreal as of August 2026. The most popular departure day for this route is Wed, with 16% of flights per week taking off on this day.