Cheap flights from Canada to St. Louis from C$ 249

The month of January is, on average, the cheapest month to fly to St. Louis from Canada, with most prices found around C$ 589. If you don’t want to visit St. Louis in January, then you should wait until February to fly from Canada, when ticket prices are also cheap, with an average price of C$ 598.

Our data shows that Saturday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as C$ 594. The most expensive day to fly to St. Louis is Monday, with ticket prices averaging around C$ 852.

The cheapest time of day to fly to St. Louis is in the morning when flights can be purchased for as low as C$ 667. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are C$ 1,013 on average. Flights to St. Louis from Canada in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Toronto Pearson Intl to Lambert-St Louis for the best Canada - Lambert-St Louis flight prices

You are more likely to see cheaper flights to St. Louis from Canada when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around C$ 731 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Canada for as low as C$ 503 on momondo.

There are 3 cabin classes available to choose from on Canada to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

United Airlines, Air Canada, and Alaska Airlines are the most popular carriers operating from Canada to Lambert-St Louis

Air Canada, United Airlines and WestJet are the top three most popular airlines that fly to St. Louis from Canada according to our data. Air Canada is the first choice among our users, with 63% of people opting to fly with this airline when travelling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

As of September 2026, there are 6 flights per day flying from Canada to St. Louis. The most common time of day flights depart is 12:00p.m., with 66% of flights taking off in the afternoon.

As of September 2026, 42 flights take off from Canada and land in St. Louis each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.