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Flights from St. Louis to Montreal

What to know about flights from St. Louis to Montreal?

The approximate distance between St. Louis and Montreal is 1,567.27 km. Average flight time from St. Louis to Montreal is around 2 hours 32 minutes. According to Trip.com data, travel demand hits its peak in July.

Cheapest one-way
US$276
American Airlines American Airlines STL-YMQ 5h 44m · 1 stop Sat, Sep 12
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Cheapest round-trip
US$599
American Airlines American Airlines STL-YMQ 10h 53m · 2 stops Sat, Oct 3 - Wed, Oct 7
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Recommended airlines
American Airlines American Airlines Cheapest · From US$276 Delta Air Lines Delta Air Lines Most booked
When to fly
October
Cheapest
July
Peak season
Route details
1,567.27 km
Flight distance
2h 32m
Average flight time

Explore the cheapest one-way and round-trip flights from St. Louis to Montreal over the next 90 days, with one-way fares from US$276 and round-trip from US$599. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        STL 12:10
        2h 31m
        Nonstop
        YUL 15:41
        St. Louis - Montreal | Fri, Sep 18 | Air Canada
        YUL 16:55
        2h 46m
        Nonstop
        STL 18:41
        Montreal - St. Louis | Tue, Sep 22 | United Airlines
        US$1,023 US$1,398
        27% off
        27% off
        US$1,398 US$1,023
      • STL 12:10
        2h 31m
        Nonstop
        YUL 15:41
        St. Louis - Montreal | Fri, Sep 18 | United Airlines
        YUL 16:55
        2h 46m
        Nonstop
        STL 18:41
        Montreal - St. Louis | Tue, Sep 22 | United Airlines
        US$1,046 US$1,398
        25% off
        25% off
        US$1,398 US$1,046
      • STL 05:00
        10h 53m
        1 stop
        YUL 16:53
        St. Louis - Montreal | Sat, Oct 3 | American Airlines
        YUL 17:34
        18h 17m
        1 stop
        STL 10:51
        Montreal - St. Louis | Wed, Oct 7 | American Airlines
        US$599 US$1,398
        56% off
        56% off
        US$1,398 US$599
      • STL 10:00
        21h 35m
        1 stop
        YUL 08:35
        St. Louis - Montreal | Fri, Sep 18 | Delta Air Lines
        YUL 09:30
        23h 36m
        1 stop
        STL 08:06
        Montreal - St. Louis | Tue, Sep 22 | Delta Air Lines
        US$603
        56% off
        US$1,398 US$603
      • STL 16:37
        16h 12m
        1 stop
        YUL 09:49
        St. Louis - Montreal | Fri, Sep 18 | American Airlines
        YUL 10:30
        11h 47m
        1 stop
        STL 21:17
        Montreal - St. Louis | Tue, Sep 22 | American Airlines
        US$608
        56% off
        US$1,398 US$608
      • STL 13:29
        6h 57m
        1 stop
        YUL 21:26
        St. Louis - Montreal | Sat, Oct 3 | United Airlines
        YUL 17:34
        18h 17m
        1 stop
        STL 10:51
        Montreal - St. Louis | Wed, Oct 7 | American Airlines
        US$619
        56% off
        US$1,398 US$619
      • STL 16:59
        6h
        1 stop
        YUL 23:59
        St. Louis - Montreal | Sat, Oct 3 | Delta Air Lines
        YUL 17:34
        18h 17m
        1 stop
        STL 10:51
        Montreal - St. Louis | Wed, Oct 7 | American Airlines
        US$642
        54% off
        US$1,398 US$642
      • STL 08:55
        6h 26m
        1 stop
        YUL 16:21
        St. Louis - Montreal | Fri, Sep 18 | Air Canada
        YUL 10:30
        6h 27m
        1 stop
        STL 15:57
        Montreal - St. Louis | Tue, Sep 22 | American Airlines
        US$647
        54% off
        US$1,398 US$647
      • STL 14:40
        4h 41m
        1 stop
        YUL 20:21
        St. Louis - Montreal | Sat, Oct 3 | Air Canada
        YUL 17:34
        18h 17m
        1 stop
        STL 10:51
        Montreal - St. Louis | Wed, Oct 7 | American Airlines
        US$698
        50% off
        US$1,398 US$698
      • STL 08:00
        5h 20m
        1 stop
        YUL 14:20
        St. Louis - Montreal | Fri, Sep 18 | United Airlines
        YUL 10:30
        6h 27m
        1 stop
        STL 15:57
        Montreal - St. Louis | Tue, Sep 22 | American Airlines
        US$704
        50% off
        US$1,398 US$704
      • STL 16:59
        6h
        1 stop
        YUL 23:59
        St. Louis - Montreal | Sat, Oct 3 | WestJet
        YUL 07:00
        7h 20m
        1 stop
        STL 13:20
        Montreal - St. Louis | Wed, Oct 7 | WestJet
        US$928
        34% off
        US$1,398 US$928
      • STL 06:00
        4h 43m
        1 stop
        YUL 11:43
        St. Louis - Montreal | Fri, Aug 21 | American Airlines
        YUL 16:55
        2h 47m
        Nonstop
        STL 18:42
        Montreal - St. Louis | Tue, Aug 25 | Air Canada
        US$1,118
        20% off
        US$1,398 US$1,118
      • STL 13:00
        17h 25m
        1 stop
        YMQ 14:00
        St. Louis - Montreal | Fri, Aug 21 | Normal Airline
        YMQ 15:00
        6h
        Nonstop
        STL 16:00
        Montreal - St. Louis | Sun, Aug 23 | Normal Airline
        More cheap flights
        More cheap flights
      • Cheapest nonstop
        STL 12:10
        2h 31m
        Nonstop
        YUL 15:41
        St. Louis - Montreal | Wed, Sep 30 | Air Canada
        US$289 US$623
        54% off
        54% off
        US$623 US$289
      • STL 12:10
        2h 32m
        Nonstop
        YUL 15:42
        St. Louis - Montreal | Fri, Aug 28 | Air Canada
        US$498 US$623
        20% off
        20% off
        US$623 US$498
      • STL 05:00
        5h 44m
        1 stop
        YUL 11:44
        St. Louis - Montreal | Sat, Sep 12 | American Airlines
        US$276 US$623
        56% off
        56% off
        US$623 US$276
      • STL 06:53
        5h 58m
        1 stop
        YUL 13:51
        St. Louis - Montreal | Fri, Sep 18 | American Airlines
        US$323
        48% off
        US$623 US$323
      • STL 17:30
        14h 5m
        1 stop
        YUL 08:35
        St. Louis - Montreal | Sat, Sep 12 | WestJet
        US$333
        47% off
        US$623 US$333
      • STL 07:00
        15h 52m
        1 stop
        YUL 23:52
        St. Louis - Montreal | Sun, Aug 30 | WestJet
        US$334
        46% off
        US$623 US$334
      • STL 07:05
        15h 45m
        1 stop
        YUL 23:50
        St. Louis - Montreal | Sun, Sep 27 | WestJet
        US$343
        45% off
        US$623 US$343
      • STL 10:29
        11h 58m
        1 stop
        YUL 23:27
        St. Louis - Montreal | Fri, Sep 18 | WestJet
        US$344
        45% off
        US$623 US$344
      • STL 08:00
        8h 30m
        1 stop
        YUL 17:30
        St. Louis - Montreal | Sat, Sep 12 | United Airlines
        US$344
        45% off
        US$623 US$344
      • STL 10:27
        6h 3m
        1 stop
        YUL 17:30
        St. Louis - Montreal | Sun, Sep 27 | United Airlines
        US$348
        44% off
        US$623 US$348
      • STL 08:55
        5h 26m
        1 stop
        YUL 15:21
        St. Louis - Montreal | Fri, Sep 18 | Air Canada
        US$360
        42% off
        US$623 US$360
      • STL 05:00
        17h 26m
        1 stop
        YUL 23:26
        St. Louis - Montreal | Sun, Aug 30 | American Airlines
        US$383
        39% off
        US$623 US$383
      • STL 13:00
        17h 25m
        1 stop
        YMQ 14:00
        St. Louis - Montreal | Fri, Aug 21 | Normal Airline
        More cheap flights
        More cheap flights

Flight.News
Flights from St. Louis to Montreal operate an average of 2 times per day over the past 7 days, with a 100.0% on-time departure rate and a 100.0% on-time arrival rate.

Which airlines are the most popular for St. Louis to Montreal flights?

You can choose from 1 airlines that fly from St. Louis to Montreal, including Delta Air Lines, American Airlines has lowest fares on this route.
Delta Air Lines logo Delta Air Lines
Airlines are determined based on actual purchased flight tickets from St. Louis to Montreal according to previous 12 months data from Trip.com.

Frequently Asked Questions

  • What are the cheapest flights from St. Louis to Montreal (STL-YMQ)?

    Based on Trip.com data, American Airlines offers one-way fares as low as US$276 on Cheapest nonstop routes (e.g. STL to YUL on Sat, Sep 12), while American Airlines offers Cheapest nonstop round-trips from US$599 departing on Sat, Oct 3 and returning on Wed, Oct 7.
  • At the moment, several airlines serve connecting flights from St. Louis to Montreal, including: Delta Air Lines Selected airlines are based on historical data collected from flight bookings made by users on Trip.com within the last 90 days.
  • It takes about 2 hours 32 minutes to fly from St. Louis to Montreal.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from St. Louis to Montreal is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • Based on Trip.com data in the past 4 weeks, there is 2 flight per week flying from St. Louis to Montreal. You can check the weekly schedule for popular airlines on this route below: United Airlines: -/-/-/-/-/-/- -- UA6646 (13:33)
  • To find best deals on flights from St. Louis to Montreal, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sat, Sep 12, with one-way flights priced at just US$276.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Air Canada.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Montreal travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from St. Louis to Montreal is October, when demand for travel is lower.
  • After crunching the numbers on our August flight calendar, it's currently cheapest to fly from St. Louis to Montreal on August 26, 2026 with American Airlines, with prices starting at US$215.
  • You can land at any one of the following hubs in Montreal, with St. Louis Lambert International Airport to Montréal-Pierre Elliott Trudeau International Airport (STL-YUL) is by far the most common option on this route: Montreal Metropolitan Airport (YHU) Montréal-Mirabel International Airport (YMX) Montréal-Pierre Elliott Trudeau International Airport (YUL).
  • The time difference between Montreal and St. Louis is 1h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.
  • Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from St. Louis to Montreal is US$345. Fares vary by travel date, airline and availability.
  • Based on Trip.com data for travel in the next 30 days, the average round-trip fare from St. Louis to Montreal is US$653. The final price depends on the outbound and return dates, airline and fare conditions.
  • Enter St. Louis and Montreal, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.

Trip.com Airline Insights on Flights from St. Louis to Montreal

Which airline offers the cheapest direct flights from St. Louis to Montreal?

Data is based on the average price of all nonstop flights from St. Louis to Montreal on Trip.com over the past 12 months.

Based on Trip.com’s data from the past 12 months, American Airlines provides the lowest-priced direct flights from St. Louis to Montreal, with fares starting at US$368.

US$306
US$368
US$431
US$493
US$555
American Airlines
US$368
American Airlines
Air Canada
US$529
Air Canada
Delta Air Lines
US$555
Delta Air Lines

How many flights fly from St. Louis to Montreal daily?

The data is based on the flight numbers for each day of the week from St. Louis to Montreal within the Trip.com database over the past month.

Based on the past month's historical data from Trip.com, the number of flights from St. Louis to Montreal is the highest on Friday and the lowest on Sunday.

10
8
6
4
Highest
8
Mon
8
Tue
8
Wed
8
Thu
10
Fri
8
Sat
6
Sun

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Note: Prices shown on this page are the estimated lowest prices found in the last 24 hours and include all taxes and fees.

Book with no extra fees

Prices displayed on this page are all-inclusive (incl. taxes, fuel surcharges, Civil Aviation Development Fund, etc.), and all fees are clearly shown before you pay. Charges for checked baggage, onboard meals, Wi‑Fi, and other optional services are also included where applicable in the flight cards.

Real-time pricing updates

Prices, availability, and travel details on this page have been updated within the last 24 hours, and for many routes are refreshed in real time. The more popular the route, the more accurate and up-to-date the data.

Change & Cancellation Policy

Trip.com shows the change and cancellation rules for each ticket during the booking process, including all related fees and conditions. Please refer to the following scenarios:
Voluntary cancellation/change:
To request a change or cancellation, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and flight segment, and submit your request. Please note that additional charges may apply based on the airline’s fare rules.
Cancellation/change due to a flight schedule change:
If your flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For full details of change and cancellation policies, please refer to the customer support pages.