Phone buried in your pocket? 🖥️ Plan a trip on our website instead
LongueuilRTL

RTL 421 bus

Grande-Allée / A.-Frappier

RTL 421 bus Stop List and Next Departures

The RTL 421 - Grande-Allée / A.-Frappier bus serves 36 bus stops in the Longueuil area departing from 5100 Armand-Frappier and ending at Terminus Longueuil. Scroll down to see upcoming 421 bus times at each stop and the next scheduled 421 bus times will be displayed. The full 421 bus schedule as well as real-time departures can be found in the Transit app.

See more departures
Stops
Tue, May 26, 2026
RTL Grande-Allée / A.-Frappier map

RTL 421 bus route map

The RTL 421 - Grande-Allée / A.-Frappier bus route map is shown above. The route map shows you an overview of all the stops served by the RTL 421 bus to help you plan your trip on RTL. Opening the app will allow you to see more detailed information about the route on a map including stop specific alerts, such as stops that have been closed or moved. You can also see the location of vehicles in real-time on the route map so you know when the 421 bus is approaching your stop.

See the detailed route map

RTL 421 bus Service Alerts

Open the Transit app to see more information about any active disruptions that may impact the 421 bus schedule, such as detours, moved stops, trip cancellations, major delays, or other service changes to the bus route. The Transit app also allows you to subscribe to receive notifications for any service alert issued by RTL so that you can plan your trip around any active or future disruptions.

See all alerts

RTL 421 bus Service Frequency

The next 421 bus leaves 5100 Armand-Frappier at 3:23 PM, and arrives at Terminus Longueuil at 4:02 PM. You can see the frequency of upcoming trips and the exact departure times by opening the Transit app.

See all departures

RTL 421 bus On-Time Performance

Want to know whether the RTL 421 bus arrives on time? Open the Transit app and view user generated on-time performance reports for the 421 bus. You can also contribute your own reports on whether your trip arrived on time, late or early. As these on-time performance stats are user reported, they may differ from official RTL metrics.

See all on-time performance details

RTL 421 bus FAQ

  • What time does the next RTL 421 bus depart from 5100 Armand-Frappier?

    The next 421 bus leaves 5100 Armand-Frappier at 3:23 PM, and arrives at Terminus Longueuil at 4:02 PM. The total trip time for the next RTL 421 bus is 39 min.

  • Is the RTL 421 bus running on time, early or late?

    You can track your bus on a map, monitor real-time updates, and see adjustments to the RTL 421 schedule by downloading the Transit app.

  • When does the next RTL 421 bus arrive?

    You can see the next RTL 421 bus times in the app as well as future departure times for the 421 bus.

  • How many bus stops are there for the RTL 421 bus?

    There are 36 stops on the RTL 421 bus.

  • Is the RTL 421 bus usually crowded?

    You can find real-time information on RTL 421 bus crowding levels in the Transit app (available in select cities or on select trips). You can also see predictions on how crowded the bus will be when it gets to your bus stop.

  • Is the RTL 421 bus currently running?

    Find out the current status for the RTL 421 bus in the Transit app.

  • What is the closest RTL 421 bus stop to me?

    Open the Transit app to see your location on a map and find the closest 421 bus stop to where you are.

Other RTL bus schedules, routes and maps

Never miss the bus again. Download Transit.

Download Transit
or
Plan a trip on our website