The average bus between Union Square and South Station takes 50 min and the fastest bus takes 35 min. The bus runs at least 2 times per hour from Union Square to South Station. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Buses run every 30 minutes between Union Square and South Station. The earliest departure is at 1:15 AM at night, and the last departure from Union Square is at 7:05 PM which arrives into South Station at 7:44 PM. All services require a transfer at Prospect St @ Union Sq - Green Line and take an average of 50 min. The schedules shown below are for the next available departures.

4h 18m • 1 change

42 min • 1 change

38 min • 1 change

46 min • 1 change
Want to know about travelling from Union Square to South Station? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct bus from Union Square to South Station. However, there are services departing from Union Square station and arriving at South Station station via Sullivan Square. The journey, including transfers, takes approximately 50 min.
Union Square to South Station bus services, operated by MBTA, depart from Prospect St @ Union Sq - Green Line station.
Union Square to South Station bus services, operated by MBTA, arrive at Devonshire St @ Milk St station.
The distance between Union Square and South Station is 4.6 km. The road distance is 7 km.
You can take a vehicle from Union Square to South Station via Prospect St @ Union Sq - Green Line, Sullivan Square, and Devonshire St @ Milk St in around 1h 4m.