Cheap flights from Montreal to St. Louis

Montreal
YMQ
Lambert-St. Louis
STL

Flight deals from Montreal to St. Louis

Below you can see the best deals on flights Montreal — St. Louis for upcoming dates. Direct and connecting flights from various airlines — compare prices and choose the right ticket.

The lowest price for the next 2 months is on 16 September, from $235.

Top 10 cheap flights from Montreal to St. Louis

WS
DL
DL
$ 236

Montreal — St. Louis

06:45—20:35
16 Sep 2026
14 h 50 m
2 stops
WS
DL
DL
$ 236

Montreal — St. Louis

06:45—20:35
23 Sep 2026
14 h 50 m
2 stops
WS
DL
DL
$ 236

Montreal — St. Louis

06:45—20:35
22 Sep 2026
14 h 50 m
2 stops
WS
DL
DL
$ 236

Montreal — St. Louis

17:45—09:29
25 Sep 2026
16 h 44 m
2 stops
WS
DL
DL
$ 236

Montreal — St. Louis

06:45—09:29
25 Sep 2026
27 h 44 m
2 stops
AC
DL
DL
$ 238

Montreal — St. Louis

19:05—09:00
15 Sep 2026
14 h 55 m
2 stops
AC
DL
DL
$ 238

Montreal — St. Louis

19:05—10:55
15 Sep 2026
16 h 50 m
2 stops
AC
DL
DL
$ 238

Montreal — St. Louis

19:05—10:55
15 Sep 2026
16 h 50 m
2 stops
AC
DL
DL
$ 238

Montreal — St. Louis

19:05—09:00
22 Sep 2026
14 h 55 m
2 stops
DL
DL
DL
DL
$ 240

Montreal — St. Louis

06:00—19:58
15 Sep 2026
14 h 58 m
3 stops

Prices were found in the last 72 hours and may change — check the exact price when you continue.

About the Montreal — St. Louis flight

Looking for cheap flights from Montreal to St. Louis? Compare fares from different airlines, check the flight schedule and travel time — and book your Montreal — St. Louis ticket online at the best price.

The route has direct flights — around 18 flights per week, flights are operated by Air Canada, a nonstop flight takes about 2 h 47 min, the distance between the cities is around 1,570 km.

Planning your trip? You may find our St. Louis travel guide, how to get from the airport into town and St. Louis weather forecast useful. To catch a low fare, use the low-price calendar and the monthly price chart on this page.

Facts about this route

from $235Min. price
SeptemberCheapest
AugustPeak season
YesDirect flights
1,570 kmDistance
2 h 47 minTravel time
1Airlines
18 / wkFlights

Flight schedule from Montreal to St. Louis

The table shows direct flights from Montreal to St. Louis on the selected date. The flight takes approximately 2 h 47 min. Regular flights are operated by Air Canada. Departures from Montreal-Pierre Elliott Trudeau International Airport and St. Hubert Airport airports, arrivals at Lambert-St. Louis International Airport.

For each flight, the following details are shown: departure time (local), arrival city and airport, flight number and airline, terminal or gate, and status. Click on a flight to open its details and go to ticket search. To view flights on a different day, change the date above the table.

Today
Any time
Last update: 25 Aug 2026

Flight ticket prices by day: Montreal — St. Louis

Below is a calendar of the lowest flight ticket prices for Montreal — St. Louis by day. Pick a convenient date and instantly see the fare. The cheapest flights on this route start from $235 in September, and the most expensive are around $438 in August. If your travel dates are flexible, the calendar will help you find the best price for your preferred period. To view round-trip fares, switch to the "Round trip" tab above the calendar, select your departure date — and the right-hand calendar will highlight the lowest prices for return flights on each day.

 
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Prices by month

Average one-way fares from Montreal to St. Louis by month. Tickets are usually cheapest in January (around $252) and priciest in August (about $324) — use the table and chart below to pick the best time to fly.

MonthAverage priceLevelMonthAverage priceLevelMonthAverage priceLevel
Jan$252lowMay$264mediumSep$282medium
Feb$252lowJun$276mediumOct$276medium
Mar$258lowJul$306highNov$270medium
Apr$270mediumAug$324highDec$318high

Some values are estimated based on seasonality.

When to fly

Weather in St. Louis: it is warmest in July (up to 31 °C on average) and coolest in January (around 5 °C). The driest month is September.

Tickets are usually cheapest in September and most expensive in August. Compare prices and weather by month in the charts below to pick the best time to fly.

Temperature · St. Louis

Dry and wet days · St. Louis

Wind speed and direction · St. Louis

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How to get the best deal on a Montreal — St. Louis ticket

  • Book ahead: fares for Montreal — St. Louis are usually lower 3–8 weeks before departure than at the last minute.
  • Play with your dates — Tuesday, Wednesday and Saturday departures are often cheaper than Friday and Sunday.
  • Montreal is served by more than one airport — compare fares and travel time to each before you book.
  • The cheapest month to fly to St. Louis is usually September — plan your trip around it if your dates are flexible.
  • Compare direct and connecting flights: nonstop is faster, while a connection is sometimes noticeably cheaper.
  • Watch the low-price calendar and the monthly price trend on this page — they make it easier to catch a good date.
  • Travelling light? Pick a cabin-baggage-only fare — tickets without checked luggage are noticeably cheaper.
  • Get to the airport in good time — about 2–3 hours before an international departure and roughly an hour before a domestic one.

Airlines

Flights on the Montreal — St. Louis route are operated by 1 airline; Air Canada runs the most flights (around 100% of all flights). Compare carriers, flight shares and schedules below.

  • Air CanadaAC
    6x/week
    WebsiteFleet: 20346M pax/year
    • Direct flight YUL → STL6x/week
      Duration
      2h 47m
      Days
      MTWTFSS
    100.0%Open →

Cities and airports on the Montreal — St. Louis route

Flights Montreal — St. Louis depart from Montreal-Pierre Elliott Trudeau International Airport and St. Hubert Airport and arrive at Lambert-St. Louis International Airport. Below are pages for the cities, countries, and airports on the route: airlines, schedules, and travel guides.

Departure

Montreal

YMQ
Canada
About the cityHow to get thereWeatherAll about the country Canada
Arrival

St. Louis

STL
United States
About the cityHow to get thereWeatherAll about the country United States
Departure airports
Arrival airports

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Frequently asked questions about the Montreal — St. Louis flight

How long is the flight from Montreal to St. Louis?

A nonstop Montreal — St. Louis flight takes about 2 h 47 min — the distance between the cities is around 1,570 km.

How far is it from Montreal to St. Louis?

The distance from Montreal to St. Louis is about 1,570 km, which a nonstop flight covers in around 2 h 47 min.

Are there direct flights from Montreal to St. Louis?

Yes, there are nonstop flights Montreal — St. Louis — around 18 flights per week.

Which airlines fly from Montreal to St. Louis?

Airlines operating Montreal — St. Louis include Air Canada. See the full list with schedules in the "Airlines" section on this page.

Which airports do Montreal — St. Louis flights use?

Flights from Montreal depart from Montreal-Pierre Elliott Trudeau International Airport, St. Hubert Airport, and arrive at Lambert-St. Louis International Airport. If a city has more than one airport, check which one your ticket uses before you travel.

How much is a ticket from Montreal to St. Louis?

The price of a Montreal — St. Louis ticket depends on your travel date, season and demand: it is usually cheapest to fly in September, and most expensive in August. Tickets typically cost between $235 and $438. Check the current lowest fare and low-price calendar on this page.

When is the best time to book flights Montreal — St. Louis?

Flights Montreal — St. Louis are usually cheaper when booked in advance — a few weeks before departure and away from peak dates; the most budget-friendly month to fly is September. Compare prices by month in the price trend chart on this page.

How can I find the cheapest flights from Montreal to St. Louis?

To catch a low fare Montreal — St. Louis, book a few weeks in advance, keep your dates flexible, and compare airlines and connecting options. The low-price calendar and monthly price chart on this page show the cheapest days and months at a glance: the most budget-friendly month to fly is usually September.

How early should I arrive at the airport?

For international flights, plan to be at the airport about 2–3 hours before departure, and around an hour before a domestic flight. Allow extra time during busy travel seasons and at large hubs, where check-in and security lines can be longer.

Where else you can fly from Montreal

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TorontoNew York CityChicagoOttawaQuebec CityWashington, D.C.HalifaxCalgaryVancouverParisDetroitBostonEdmontonSt. John'sFrederictonAtlantaPhiladelphiaMinneapolisMiamiMonctonLondonWinnipegOrlandoPunta CanaCancunFort LauderdaleNashvilleSan FranciscoRomeCharlottetownLos AngelesLas VegasCasablancaFrankfurt am MainRaleighSan DiegoSidneyDallasLisbonAlgiers

Where else you can fly from St. Louis

See all
ChicagoDallasNew York CityAtlantaSeattleMinneapolisTorontoDenverHoustonCharlotteWashington, D.C.DetroitPortlandBostonOrlandoPhoenixPhiladelphiaSalt Lake CityMiamiLos AngelesLas VegasCancunFort LauderdaleJonesboroSan FranciscoLondonTampaFrankfurt am MainPunta CanaQuincyManhattan

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