Cheap flights from St. Louis to Montreal from $139
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Montreal departing on 10/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from St. Louis to Montreal
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
American Airlines flights from St. Louis to Montreal
Our best American Airlines deals on St. Louis to Montreal flight tickets
United Airlines flights from St. Louis to Montreal
Our best United Airlines deals on St. Louis to Montreal flight tickets
See travel insights to Montreal from
How to get the cheapest flight ticket from St. Louis to Montreal
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between St. Louis and Montreal?
What is the cheapest month to fly to Montreal?
The cheapest month to fly to Montreal from St. Louis is in November. Flight prices, which tend to average around $471, are often lower during this time because this is during the off-season. If you are unable to visit Montreal during the month of November, then departing from St. Louis during the month August is also very affordable. Most momondo users find prices during this month for around $537.
What is the cheapest day to depart on your flight to Montreal?
The cheapest day to depart from St. Louis to Montreal is on a Tuesday when prices can be found for as low as $1,061. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,210. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Montreal?
Our most recent data shows that the best time of day to fly to Montreal is in the evening. Flights from St. Louis to Montreal during this time can be as low as $266. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,166 per ticket.
What is the cheapest Lambert-St Louis to Montreal flight route?
Fly from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl for the best Lambert-St Louis - Montreal flight prices
What cabin class options are available on Lambert-St Louis to Montreal flights?
There are 4 cabin classes available to choose from on Lambert-St Louis to Montreal flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on St. Louis to Montreal flights?
You could potentially save up to 37% on your flight if you consider stops on a St. Louis to Montreal flight.
What is the cheapest airline that flies from Lambert-St Louis to Montreal?
American Airlines, Delta, and United Airlines are the most popular carriers operating from Lambert-St Louis to Montreal
What airlines fly to Montreal?
Air Canada, Delta and United Airlines are the top three most popular airlines that fly to Montreal from St. Louis according to our data. Air Canada is the first choice among our users, with 46% of people opting to fly with this airline when traveling to Montreal. Keep in mind that there are 4 different airlines that fly to Montreal on a routine basis, so you have a few additional options to choose from.
How many flights depart from St. Louis to Montreal on average per day?
As of June 2025, 2 flights take off from St. Louis and land in Montreal each day. The most common flight departure time for this route is 1:00PM, with 100% of daily flights taking off in the afternoon.
How many flights depart from St. Louis to Montreal on average per week?
As of June 2025, 14 flights take off from St. Louis and land in Montreal each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.
When to book flights from St. Louis to Montreal
Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Montreal
How far is Lambert-St Louis to Montreal by plane?
The distance between Lambert-St Louis and Montreal is about 973.0 mi. A reasonable flight in good conditions will take 2h 30m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal?
Prices for flights from Lambert-St Louis Airport to Montreal are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Montreal?
As of June 2025, there are 4 operators available to choose from for flights from Lambert-St Louis Airport to Montreal.
How old do you have to be to fly from Lambert-St Louis Airport to Montreal?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Montreal.
What documentation or ID do you need to fly to Montreal?
The required travel and health documents for your Montreal trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Montreal. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from St. Louis to Montreal?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from St. Louis to Montreal is Canadair (Bombardier) Regional Jet 900 (46.21% of total bookings). The next most popular plane models are Airbus A330-300 (21.97%), Airbus A220-300 (16.67%), and Boeing 787-8 Dreamliner (3.03%).
What is the most popular airline from St. Louis to Montreal?
Based on momondo bookings for flights between St. Louis and Montreal, the leading airline is Air Canada, making up 61% of the total bookings. Other popular airlines include United Airlines with 21%, Delta with 10%, and American Airlines with 8%.
Best airlines flying from St. Louis to Montreal
Compare and see reviews for airlines that fly from St. Louis to Montreal with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $246 | Free Cancellation | Rating 7.4 8,809 reviews | |||
| PriceFrom $255 | Free Cancellation | Rating 8.0 7,965 reviews | |||
| PriceFrom $259 | Free Cancellation | Rating 7.1 9,568 reviews | |||
| PriceFrom $330 | Free Cancellation | Rating 7.2 10,000 reviews |
United Airlines Flights From St. Louis to Montreal
Across 7 United Airlines flights from St. Louis to Montreal this week, the average price was $646, with the best United Airlines deals starting from $246 round-trip. 8,809 users have rated United Airlines on momondo, with an average score of 7.4/10.
Air Canada Flights From St. Louis to Montreal
Air Canada (7.1/10 from 9,572 reviews) operates around 7 flights from St. Louis to Montreal in any given week. The average Air Canada airfare for this route is around $692, with deals from around $259 rare but found on momondo. Referenced prices are for round-trip St. Louis to Montreal flight searches in the last 72 hours.
Why use momondo?
Why should I use momondo to find a flight deal from St. Louis to Montreal?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Montreal for you.
Can I find flights from St. Louis to Montreal with flexible booking policies on momondo?
All flight searches from St. Louis to Montreal on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from St. Louis to Montreal?
Once all potential St. Louis to Montreal flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from St. Louis to Montreal right now. Can momondo alert me if prices change?
Yes. momondo can track prices for St. Louis to Montreal flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.