Cheap flights from Montreal to St. Louis

Round-trip
Economy
Montreal (YMQ)
St. Louis (STL)
Depart
Return
Any month
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The best prices from Montreal to Lambert-St Louis are usually found in August or April, booked 53 days in advance, depart on a Tuesday or Wednesday and return on a Monday

How to find the cheapest flight from
Montreal (YMQ) to St. Louis (STL)

All the information you need to plan the best YMQ to STL flight in 2021: compare Montreal to St. Louis flight prices with the expected peak season, weather and rainfall in St. Louis.
YMQ - STL
Price
C$ 280 - C$ 466
STL
Temperature
0 - 27 °C
STL
Precipitation
56 - 119 mm

Popular in

September

High demand for flights, 19% potential price rise

Cheapest in

August

Best time to find cheap flights, 26% potential price drop

Round-trip from

$280

From Montreal All airports (YMQ) to Lambert-St Louis

One-way from

C$ 236

One-way flight from Montreal All airports (YMQ) to Lambert-St Louis

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
How far in advance should I book a flight from Montreal to St. Louis?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 54 days in advance, which can save you up to 55% on flights from Montreal to St. Louis compared to booking the week you need them. Waiting 54 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at C$ 457. For sooner than that we have options available in the next 3 days from C$ 538.

What is the cheapest month to fly from Montreal to St. Louis?

Flights from Montreal to St. Louis lean towards being more expensive in September. Prices are generally better when you fly from Montreal to St. Louis in August, with the cheapest ticket starting at C$ 142.

What is the cheapest day to fly round-trip from Montreal to St. Louis?

Users have found that flying from Montreal to St. Louis on a Saturday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

When is the cheapest time to fly from Montreal to St. Louis (YMQ - STL)?

Unlike at noon, when flights are generally more expensive, you can save up to 29% on flights from Montreal to St. Louis by exploring options for tickets in the morning.

Cheap flights from Montreal to St. Louis in September, October 2021

The best prices found for YMQ to STL flights for September, October
29 Oct - 31 Oct
C$ 406pp
YUL
Montreal Pierre Elliott Trudeau Intl
Delta
   
2 STOPS
STL
Lambert-St Louis
STL
Lambert-St Louis
Delta
   
2 STOPS
YUL
Montreal Pierre Elliott Trudeau Intl
29 Oct - 31 Oct
C$ 412pp
YUL
Montreal Pierre Elliott Trudeau Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Delta
   
2 STOPS
YUL
Montreal Pierre Elliott Trudeau Intl
29 Oct - 31 Oct
C$ 416pp
YUL
Montreal Pierre Elliott Trudeau Intl
Delta
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Delta
   
2 STOPS
YUL
Montreal Pierre Elliott Trudeau Intl

Montreal to St. Louis 2021 flight deals

Cheap flights to St. Louis from Montreal found for this year
3 Nov - 4 Nov
C$ 398pp
YUL
Montreal Pierre Elliott Trudeau Intl
American Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
American Airlines
 
1 STOP
YUL
Montreal Pierre Elliott Trudeau Intl
26 Nov - 30 Nov
C$ 403pp
YUL
Montreal Pierre Elliott Trudeau Intl
American Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
American Airlines
   
2 STOPS
YUL
Montreal Pierre Elliott Trudeau Intl
21 Dec - 24 Dec
C$ 404pp
YUL
Montreal Pierre Elliott Trudeau Intl
American Airlines
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
American Airlines
 
1 STOP
YUL
Montreal Pierre Elliott Trudeau Intl

Last minute flights from Montreal to St. Louis

Late deals on round-trip flights to St. Louis from Montreal, departing today and this week
6 Oct - 13 Oct
C$ 557pp
YUL
Montreal Pierre Elliott Trudeau Intl
Delta
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Delta
   
2 STOPS
YUL
Montreal Pierre Elliott Trudeau Intl
4 Oct - 8 Oct
C$ 854pp
YUL
Montreal Pierre Elliott Trudeau Intl
Delta
 
1 STOP
STL
Lambert-St Louis
STL
Lambert-St Louis
Delta
   
2 STOPS
YUL
Montreal Pierre Elliott Trudeau Intl

One-way flights to Lambert-St Louis from Montreal

The cheapest one-way flights from Montreal to St. Louis
2:30 a.m. - 6:59 p.m.
American Airlines
1 stop
17h 29m
YUL - STL
American Airlines
C$ 236
4:50 a.m. - 3:14 p.m.
Delta
2 stops
11h 24m
YUL - STL
Delta
C$ 352
Delta
7:10 p.m. - 5:50 a.m.
Multiple Airlines
3 stops
35h 40m
YUL - STL
Multiple Airlines
C$ 527
Kiwi.com

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Montreal</span> to <span class="emphasized">St. Louis</span> flights.

Flight FAQs

From Montreal to St. Louis

What airport do you fly into for flights to St. Louis from Montreal?

Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Montreal. On average, Lambert-St Louis has 0 inbound flights from Montreal per day from 5 airlines. Lambert-St Louis is conveniently located just 20.4 km from St. Louis’s city centre.

Which airlines flying from Montreal to Lambert-St Louis have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like American Airlines, Air Canada, and Delta flying from Montreal to Lambert-St Louis have implemented new flexible cancellation policies.

Can I find flights from Montreal to St. Louis for under C$ 400 on Cheapflights?

Yes, there are multiple flights from Montreal to St. Louis for under C$ 400. The cheapest flight booked recently is on American Airlines for just C$ 398, but on average you can expect to pay C$ 436.

Are there last-minute flights available from Montreal to St. Louis for under C$ 600?

There are currently 2+ open flights from Montreal to St. Louis within the next 7 days for less than C$ 600.

What are the cheapest airlines flying from Montreal to St. Louis round-trip?

Currently priced at C$ 398, American Airlines will fly you from Montreal to St. Louis and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and Air Canada - these airlines can fly you to your destination from C$ 406 and C$ 419, respectively.

What are the most popular airlines that fly from Montreal to St. Louis?

Consider American Airlines, Air Canada or Delta when booking your flight. These represent the most popular airlines when flying from Montreal to St. Louis.

What are the cheapest flights from Montreal to St. Louis?

Looking at all options, your cheapest flight can be booked for C$ 223. While the most popular route (Montreal Pierre Elliott Trudeau Intl - Lambert-St Louis) can be booked for C$ 416 on average our data indicates C$ 400 when flying from Montreal to St. Louis

COVID Restrictions

View COVID Travel Restrictions for St. Louis, MO

Do I need a COVID test to fly to St. Louis from Montreal?

Information is based on travel restrictions from Montreal to Lambert-St Louis

Most visitors from Montreal need to provide a negative COVID-19 test result and/or quarantine to enter Lambert-St Louis.

COVID-19 testing requirements
Visitors from Montreal must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Lambert-St Louis.

Quarantine requirements
Visitors from Montreal are not required to quarantine after entering Lambert-St Louis.

Do I need a test to fly back to Montreal from St. Louis?

Returning to Montreal from Lambert-St Louis

COVID-19 testing requirements
Visitors from Lambert-St Louis must present a negative RT-PCR (NAAT) test taken 72 hours before departing to Montreal.

Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Montreal.

Hide COVID Travel Restrictions for St. Louis, MO

Destination information for St. Louis

Things to know before you go - useful duration and weather info for your trip from Montreal to St. Louis.
Today's exchange rate
C$ 1 = $0.80
Average temperature for September in St. Louis
28.0 °C
Avg rainfall for September in St. Louis
76.0 mm

Airports servicing Montreal

Montreal Pierre Elliott Trudeau Intl (YUL)
Montreal St Hubert (YHU)

Airports servicing St. Louis

Top 5 airlines flying from Montreal to Lambert-St Louis

The chart below displays the airlines Cheapflights users travelling from Montreal to St. Louis choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Delta
C$ 171 C$ 465 No cancel fee N/A
Search Delta flights
United Airlines
C$ 229 C$ 552 No cancel fee 69%
Search United Airlines flights
American Airlines
C$ 270 C$ 467 No cancel fee 71%
Search American Airlines flights
WestJet
C$ 315 C$ 433 No cancel fee 60%
Search WestJet flights
Air Canada
C$ 337 C$ 436 No cancel fee 67%
Search Air Canada flights
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