Cheap flights from St. Louis to Montreal from $264
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 10/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Fly from
Fly to
Route
Depart
Return
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Sat 11/14
2:00 pm-8:34 am
1 stop17h 34m
Montreal Pierre Elliott Trudeau Intl
Tue 12/15
9:40 am-8:26 pm
1 stop11h 46m
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Tue 11/17
1:02 pm-8:44 am
1 stop18h 42m
Montreal Pierre Elliott Trudeau Intl
Tue 12/15
7:44 pm-11:51 am
1 stop17h 07m
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Sat 11/14
8:00 am-8:34 am
1 stop23h 34m
Montreal Pierre Elliott Trudeau Intl
Tue 12/15
9:40 am-8:32 pm
2 stops11h 52m
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Tue 11/17
7:00 am-11:27 pm
2 stops15h 27m
Montreal Pierre Elliott Trudeau Intl
Tue 12/15
9:40 am-8:26 pm
1 stop11h 46m
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Sat 10/24
12:10 pm-3:41 pm
Nonstop2h 31m
Montreal Pierre Elliott Trudeau Intl
Tue 10/27
10:10 am-3:23 pm
1 stop6h 13m
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Mon 10/26
8:00 am-7:48 pm
1 stop10h 48m
Montreal Pierre Elliott Trudeau Intl
Fri 10/30
6:50 pm-9:03 am
1 stop15h 13m
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Sat 10/24
8:55 am-3:21 pm
1 stop5h 26m
Montreal Pierre Elliott Trudeau Intl
Tue 10/27
11:10 am-3:23 pm
1 stop5h 13m
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Mon 10/26
8:00 am-7:48 pm
1 stop10h 48m
Montreal Pierre Elliott Trudeau Intl
Fri 10/30
6:50 pm-9:03 am
1 stop15h 13m
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Mon 10/26
6:50 pm-2:00 pm
1 stop18h 10m
Montreal Pierre Elliott Trudeau Intl
Fri 10/30
6:50 pm-9:03 am
1 stop15h 13m
St. LouisMontreal
STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl
STLYUL
Lambert-St Louis
Mon 10/26
4:05 pm-11:25 pm
1 stop6h 20m
Montreal Pierre Elliott Trudeau Intl
Fri 10/30
10:10 am-3:23 pm
1 stop6h 13m
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?
Prices are currently low for flights on this route.
Typical prices usually range from $594 to $849.The lowest price recently found on this route was $553.
What is the cheapest month to fly to Montreal?
The cheapest month to fly to Montreal from St. Louis is in August. Flight prices, which tend to average around $457, are often lower during this time because this is during the off-season. If you are unable to visit Montreal during the month of August, then departing from St. Louis during the month February is also very affordable. Most momondo users find prices during this month for around $506.
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 $930. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,226. 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 morning. Flights from St. Louis to Montreal during this time can be as low as $994. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,148 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 St. Louis to Montreal flights?
There are 4 cabin classes available to choose from on 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?
No. A direct flight is the cheapest option for a flight between St. Louis to Montreal.
Which airport is the most popular layover for flights between St. Louis and Montreal?
Toronto (YYZ) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from St. Louis to Montreal?
Flights via Toronto (YYZ) offer the lowest average round-trip price of $668.
Which layover airport has the shortest travel time from St. Louis to Montreal?
Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 4h 27m.
Which layover airport has the shortest connection time from St. Louis to Montreal?
Detroit (DTW) has the shortest average layover time for this route: 1h 09m.
How many flights depart from St. Louis to Montreal on average per day?
As of October 2026, 3 flights take off from St. Louis and land in Montreal each day. The most common flight departure time for this route is 9:00AM, with 50% of daily flights taking off at noon.
How many flights depart from St. Louis to Montreal on average per week?
As of October 2026, 21 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
Frequently asked questions about flying 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 31m.
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 October 2026, there are 2 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 (62.30% of total bookings). The next most popular plane models are Boeing 787-8 Dreamliner (18.03%), Embraer 175 (9.84%), and Airbus A330-300 (4.92%).
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 71% of the total bookings. Other popular airlines include United Airlines with 16% and Delta with 13%.
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 $257 | Free Cancellation | Rating 7.1 11,741 reviews | |||
| PriceFrom $296 | Free Cancellation | Rating 7.4 10,308 reviews |
United Airlines Flights From St. Louis to Montreal
Across 14 United Airlines flights from St. Louis to Montreal this week, the average price was $743, with the best United Airlines deals starting from $296 round-trip. 10,308 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 11,741 reviews) operates around 7 flights from St. Louis to Montreal in any given week. The average Air Canada airfare for this route is around $667, with deals from around $257 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.