Cheap Flights from Montreal to St Louis

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Compare Montreal to St Louis flight deals

Find the cheapest month or even day of the year to fly to St Louis

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Flight deals from Montreal to St Louis

Looking for a cheap last-minute deal or the best return flight from Montreal to St Louis? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Montreal to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Montreal to St Louis flights are currently cheapest in June.

Direct flights from Montreal to St Louis

Montreal to St Louis: Alternative routes

Compare routes from Montreal to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

Montreal to St Louis: Flight information

The things to know before you go.
Cheapest flight foundR 3,335
Cheapest month to flyJune
Average flight time2 hrs, 49 mins
Most popular airlineAir Canada
Average flights per week22

Finding cheap flights from Montreal to St Louis: Frequently asked questions

The best price we found for a return flight from Montreal to St Louis is R 7,206. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 49 minutes is the average flight time from Montreal to St Louis.
Air Canada, PAL Airlines and United fly direct from Montreal to St Louis.
As of May 2025, there are 22 flights per week flying from Montreal to St Louis.
The cheapest month to fly from Montreal to St Louis is usually May 2025.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Montreal to St Louis Airport on Tuesday, 10 June 2025.
Yes – the average flight time is 2 hours and 49 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.

Flying from Montreal to Lambert-St. Louis International Airport (STL): what you need to know

  • Planning your holiday starts with working out where you'll fly out of in Montreal. Montreal-Pierre Elliott Trudeau International Airport (YUL) is the city's main airport, so explore your options for reserving a flight from Montreal to Lambert-St. Louis International Airport (STL) departing from here.

  • Book a direct flight from Montreal to Lambert-St. Louis International Airport and you'll be in the air for around 2 hours 35 minutes.

  • The timezone in St Louis is UTC-5, which is 1 hour behind Montreal. Lambert-St. Louis International Airport is located in St Louis.

  • The busiest route is from Montreal-Pierre Elliott Trudeau International Airport (YUL) to Lambert-St. Louis International Airport (STL), with 6 direct services every week. If you want to get going as soon as possible, the earliest flight from YUL to STL is the 19:30 Air Canada service. If you prefer to travel later, the last departure is at 19:30 with Air Canada.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for hassle-free flying. Make sure you're at the airport on time to catch your flight from Montreal to STL.

  • Show up at the airport even earlier during popular months like August. Aim for two hours before domestic departures and up to four hours for international flights. After checking in, you can use any extra time to finalize your plans or simply relax.

Airports in Montreal

Montreal-Pierre Elliott Trudeau International Airport (YUL)

  • Montreal-Pierre Elliott Trudeau International Airport (YUL) makes it easy to travel directly to your destination. Nonstop flights from Montreal to Lambert-St. Louis International Airport (STL) take off from this terminal.

  • If you want to leave from YUL, you can catch a direct flight from Montreal to Lambert-St. Louis International Airport with Air Canada.

  • The distance from central Montreal to YUL is approximately 26 kilometres. Check out travel apps like Google Maps for the quickest route, whether that's in your own car or with public transport.

  • Looking for a handy hotel near Montreal-Pierre Elliott Trudeau International Airport? If you're catching an early flight from Montreal to Lambert-St. Louis International Airport, these accommodation options will put you moments from your departure gate:

About Lambert-St. Louis International Airport (STL)

Getting from Lambert-St. Louis International Airport (STL) to central St Louis

  • Lambert-St. Louis International Airport to the centre of St Louis takes about 21 minutes by car. It's approximately 26 kilometres away. Discover what options are available, such as cabs, car rentals or ride-sharing services.

  • When travelling on public transport, expect a journey of around 36 minutes.

How to find the cheapest flights from Montreal to Lambert-St. Louis International Airport (STL)

  • Pick up a one-way ticket from Montreal to Lambert-St. Louis International Airport from R 3,345 or travel return from just R 7,228. The prices shown are based on availability and could change when you book.

  • We recommend booking 8 months ahead. Flight price data suggests you're more likely to find cheap tickets from Montreal to STL within that timeframe.

  • You'll land the biggest savings on your tickets from Montreal to Lambert-St. Louis International Airport if you take off in May. Take it one step further and use the 'Whole month' tool to see the cheapest day to fly.

  • Finding a cheap ticket from Montreal to STL couldn't be easier with Price Alerts. All you need to do is set up one of these automatic alerts and we'll notify you when the price has dropped.

  • Tailor your trip with filters. Pick your departure and arrival times, total journey duration and airlines. You can also sort the results by 'Cheapest,' 'Fastest' or 'Best' flights from Montreal to Lambert-St. Louis International Airport.

The best time to fly from Montreal to Lambert-St. Louis International Airport (STL)

  • July is the busiest month to hop on a flight from Montreal to Lambert-St. Louis International Airport while April is the quietest. To work out the ideal time to go to St Louis, consider whether you like a lively atmosphere or a quieter vibe.

  • When booking your flight from Montreal to STL, think about the kind of weather you enjoy. July is the warmest month in St Louis, with the temperature ranging from 17ºC to 33ºC.

  • January has average temperatures of between -8ºC and 7ºC. Search for cheap flights from Montreal to Lambert-St. Louis International Airport sometime then if you'd rather travel in cooler conditions.

More about St Louis

Complete your St Louis trip with a car rental

  • We use the same magic that helped you find your cheap flight from Montreal to Lambert-St. Louis International Airport to track down your perfect ride. Browse our car rentals in St Louis and compare offers in one place. Plus we give you all the info you need to know, from the most popular car type to the best time to book.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.