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TucsonSun Tran

Sun Tran 21 bus

Congress / Silverbell

88 % on time

Sun Tran 21 bus Stop List and Next Departures

The Sun Tran 21 - Congress / Silverbell bus serves 28 bus stops in the Tucson area departing from Downtown Ronstadt Center (D) and ending at Goret / Dales Crossing (SE). Scroll down to see upcoming 21 bus times at each stop and the next scheduled 21 bus times will be displayed. The full 21 bus schedule as well as real-time departures can be found in the Transit app.

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Stops
Fri, May 8, 2026
Sun Tran Congress / Silverbell map

Sun Tran 21 bus route map

The Sun Tran 21 - Congress / Silverbell bus route map is shown above. The route map shows you an overview of all the stops served by the Sun Tran 21 bus to help you plan your trip on Sun Tran. 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 21 bus is approaching your stop.

See the detailed route map

Sun Tran 21 bus Service Alerts

Open the Transit app to see more information about any active disruptions that may impact the 21 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 Sun Tran so that you can plan your trip around any active or future disruptions.

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Sun Tran 21 bus Service Frequency

The next 21 bus leaves Downtown Ronstadt Center (D) at 8:45 AM, and arrives at Goret / Dales Crossing (SE) at 9:10 AM. You can see the frequency of upcoming trips and the exact departure times by opening the Transit app.

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Sun Tran 21 bus On-Time Performance

88 % on time

88% of riders report that the Sun Tran 21 bus arrived on time on their previous trip. In the past 30 days, 15 riders reported on the on-time performance of the 21 bus. Compared to other Sun Tran lines, the 21 bus is ranked 1 out of 38 Sun Tran lines. These on-time performance stats are user reported and may differ from official Sun Tran metrics. See more details about on time, late or early departure reports for the 21 by opening the Transit app.

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Sun Tran 21 bus FAQ

  • What time does the next Sun Tran 21 bus depart from Downtown Ronstadt Center (D)?

    The next 21 bus leaves Downtown Ronstadt Center (D) at 8:45 AM, and arrives at Goret / Dales Crossing (SE) at 9:10 AM. The total trip time for the next Sun Tran 21 bus is 25 min.

  • Is the Sun Tran 21 bus running on time, early or late?

    You can track your bus on a map, monitor real-time updates, and see adjustments to the Sun Tran 21 schedule by downloading the Transit app.

  • When does the next Sun Tran 21 bus arrive?

    You can see the next Sun Tran 21 bus times in the app as well as future departure times for the 21 bus.

  • How many bus stops are there for the Sun Tran 21 bus?

    There are 28 stops on the Sun Tran 21 bus.

  • Is the Sun Tran 21 bus usually crowded?

    You can find real-time information on Sun Tran 21 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 Sun Tran 21 bus currently running?

    Find out the current status for the Sun Tran 21 bus in the Transit app.

  • What is the closest Sun Tran 21 bus stop to me?

    Open the Transit app to see your location on a map and find the closest 21 bus stop to where you are.

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