Cheap flights from St. Louis to Montreal

Lambert-St. Louis
STL
Montreal
YMQ

Flight deals from St. Louis to Montreal

Below you can see the best deals on flights St. Louis — Montreal 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 1 September, from $237.

Top 10 cheap flights from St. Louis to Montreal

About the St. Louis — Montreal flight

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

The route has direct flights — around 32 flights per week, flights are operated by Air Canada, United Airlines, a nonstop flight takes about 2 h 32 min, the distance between the cities is around 1,570 km.

Planning your trip? You may find our Montreal travel guide, how to get from the airport into town and Montreal 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 $237Min. price
SeptemberCheapest
MarchPeak season
YesDirect flights
1,570 kmDistance
2 h 32 minTravel time
2Airlines
32 / wkFlights

Flight schedule from St. Louis to Montreal

The table shows direct flights from St. Louis to Montreal on the selected date. The flight takes approximately 2 h 32 min. Regular flights are operated by Air Canada and United Airlines. Departures from Lambert-St. Louis International Airport airports, arrivals at Montreal-Pierre Elliott Trudeau International Airport and St. Hubert 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: St. Louis — Montreal

Below is a calendar of the lowest flight ticket prices for St. Louis — Montreal by day. Pick a convenient date and instantly see the fare. The cheapest flights on this route start from $237 in September, and the most expensive are around $323 in March. 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 St. Louis to Montreal by month. Tickets are usually cheapest in January (around $273) and priciest in July (about $387) — use the table and chart below to pick the best time to fly.

MonthAverage priceLevelMonthAverage priceLevelMonthAverage priceLevel
Jan$273lowMay$320mediumSep$320medium
Feb$278lowJun$358highOct$311medium
Mar$283lowJul$387highNov$302low
Apr$311mediumAug$377highDec$340high

Some values are estimated based on seasonality.

When to fly

Weather in Montreal: it is warmest in July (up to 27 °C on average) and coolest in January (around -4 °C). The driest month is September.

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

Temperature · Montreal

Dry and wet days · Montreal

Wind speed and direction · Montreal

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

  • Book ahead: fares for St. Louis — Montreal 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.
  • The cheapest month to fly to Montreal 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 St. Louis — Montreal route are operated by 2 airlines; Air Canada runs the most flights (around 94% of all flights). Compare carriers, flight shares and schedules below.

  • Air CanadaAC
    10x/week
    WebsiteFleet: 20346M pax/year
    • Direct flight STL → YUL10x/week
      Duration
      2h 32m
      Days
      MTWTFSS
    93.8%Open →
  • United AirlinesUA
    1x/week
    WebsiteFleet: 956165M pax/year
    • Direct flight STL → YUL1x/week
      Duration
      2h 32m
      Days
      MTWTFSS
    6.3%Open →

Cities and airports on the St. Louis — Montreal route

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

Departure

St. Louis

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

Montreal

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

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Frequently asked questions about the St. Louis — Montreal flight

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

A nonstop St. Louis — Montreal flight takes about 2 h 32 min — the distance between the cities is around 1,570 km.

How far is it from St. Louis to Montreal?

The distance from St. Louis to Montreal is about 1,570 km, which a nonstop flight covers in around 2 h 32 min.

Are there direct flights from St. Louis to Montreal?

Yes, there are nonstop flights St. Louis — Montreal — around 32 flights per week.

Which airlines fly from St. Louis to Montreal?

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

Which airports do St. Louis — Montreal flights use?

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

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

The price of a St. Louis — Montreal ticket depends on your travel date, season and demand: it is usually cheapest to fly in September, and most expensive in March. Tickets typically cost between $237 and $323. Check the current lowest fare and low-price calendar on this page.

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

Flights St. Louis — Montreal 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 St. Louis to Montreal?

To catch a low fare St. Louis — Montreal, 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 St. Louis

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

Where else you can fly from Montreal

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

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