Cheap flights from Toronto to St. Louis from C$ 270

The month of June is, on average, the cheapest month to fly to St. Louis from Toronto, with most prices found around C$ 492. If you don’t want to visit St. Louis in June, then you should wait until January to fly from Toronto, when ticket prices are also cheap, with an average price of C$ 541.

Our data shows that Thursday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as C$ 550. The most expensive day to fly to St. Louis is Monday, with ticket prices averaging around C$ 806.

The cheapest time of day to fly to St. Louis is in the morning when flights can be purchased for as low as C$ 538. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are C$ 606 on average. Flights to St. Louis from Toronto in the afternoon 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 Toronto - Lambert-St Louis flight prices

You are more likely to see cheaper flights to St. Louis from Toronto when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around C$ 629 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Toronto for as low as C$ 487 on momondo.

There is only 1 cabin class available to choose from on Toronto to Lambert-St Louis 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 29% on your flight if you consider stops on a Toronto to St. Louis flight.

As of March 2026, prices for Toronto to St. Louis flights are approximately 41% cheaper when compared to flights at the same time last year.

Chicago (ORD) was the most common stop: 75% of momondo users choosing one-stop flights on this route connected there.

Flights via Chicago (ORD) offer the lowest average round-trip price of C$ 483.

Flights connecting via Chicago (ORD) have the shortest average one-way travel time: 4h 09m.

Chicago (ORD) has the shortest average layover time for this route: 0h 53m.

As of March 2026, 2 flights take off from Toronto and land in St. Louis each day. The most common flight departure time for this route is 2:00p.m., with 100% of daily flights taking off in the afternoon.

As of March 2026, there are 14 flights per week flying from Toronto to St. Louis. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.