Cheap flights from Chicago O'Hare Intl Airport to Montreal from C$ 175

The month of February is, on average, the cheapest month to fly to Montreal Pierre Elliott Trudeau Intl Airport from Chicago O'Hare Intl Airport, with most prices found around C$ 349. The month of April is another great option to travel to Montreal Pierre Elliott Trudeau Intl Airport, with average flight prices from Chicago O'Hare Intl Airport averaging around C$ 387.

The cheapest day to depart on your flight to Montreal Pierre Elliott Trudeau Intl Airport is on a Friday when prices can be found for as low as C$ 253. This is often the case because there is less demand to fly during this day of the week. On the other hand, Sunday is the most expensive day to depart from Chicago O'Hare Intl Airport because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 591.

In the afternoon is the cheapest time of day to fly from Chicago O'Hare Intl Airport to Montreal Pierre Elliott Trudeau Intl Airport when you can find flight prices for as low as C$ 253. Flying to Montreal Pierre Elliott Trudeau Intl Airport in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around C$ 528. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

You are more likely to see cheaper flights to Montreal Pierre Elliott Trudeau Intl Airport from Chicago O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Montreal Pierre Elliott Trudeau Intl Airport for around C$ 507 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Montreal Pierre Elliott Trudeau Intl Airport from Chicago O'Hare Intl Airport for as low as C$ 326 on momondo.

Historically, on average around 19% 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 139 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. Friday 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 Pierre Elliott Trudeau Intl Airport is 21 per day as of May 2026. The most frequent departure time is 7:00a.m., with 43% of daily flights leaving at noon.

153 flights are operational weekly from Chicago O'Hare Intl Airport to Montreal Pierre Elliott Trudeau Intl Airport as of May 2026. The most popular departure day for this route is Fri, with 16% of flights per week taking off on this day.