South Station to Castle Island
The bus route from South Station to Castle Island: where to board, where to change, where to get off and how late it runs.
South Station to Castle Island
- Bus 7
- Take bus 7From Summer St @ South Station - Red Line entrance, toward City Point13 stops, about 14 min
- Get off at E Broadway @ Farragut RdThe stop after E Broadway @ P St
- Walk about 16 min to Castle Island
Weekdays, fall 2026 schedule · First and last trips
Quick answer: Take bus 7 to E Broadway @ Farragut Rd, and walk about 16 min. The trip takes about 30 minutes (27-32 min depending on the connection). On weekdays bus 7 runs every 6 min during the day.
Get the live route from South Station to Castle Island
Step by step
- At Summer St @ South Station - Red Line entrance, take bus 7 toward City Point.
- Ride about 14 min (13 stops). Get off at E Broadway @ Farragut Rd, the stop after E Broadway @ P St.
- Walk about 16 min to Castle Island.
Other ways to go
- Take bus 11 to Farragut Rd @ Broadway, and walk about 16 min: about 38 min.
Which one is faster depends on when you leave. Cobblehop compares them with live times and gives you the one that gets you there first.
Times and frequency
| Day | First trip | Last trip | How often (daytime) | Trip time |
|---|---|---|---|---|
| Monday-Friday | 5:36 am | 1:17 am | Every 6 min | About 30 min |
| Saturday | 5:39 am | 1:05 am | About every 40 min | About 30 min |
| Sunday | 6:27 am | 1:12 am | Varies | About 30 min |
First and last trip are when the first bus of the trip leaves Summer St @ South Station - Red Line entrance, on the fall 2026 schedule. "How often" is for bus 7.
Late at night
On weekdays, the last trip that works leaves Summer St @ South Station - Red Line entrance at 1:17 am and gets to Castle Island around 1:52 am, using bus 11. On Saturday nights the last trip leaves at 1:05 am, and on Sunday nights at 1:12 am. Late at night, ask Cobblehop for the last trip. It checks live times and tells you when to leave.
Tips for this trip
- Check the sign on the bus. Some bus 7 trips from Summer St @ South Station - Red Line entrance end early or go another way (City Point via East First St) and don't reach E Broadway @ Farragut Rd.
- Know your stop. Get to the door after E Broadway @ P St. The next stop is E Broadway @ Farragut Rd. Start a live trip in Cobblehop and it alerts you before your stop.
- Castle Island is at the end of Day Boulevard in South Boston. Fort Independence and Sullivan's are on the island.
- South Station has the Red Line and Silver Line underground, Commuter Rail and Amtrak on the main concourse, and the intercity bus terminal upstairs next door.
What it costs
- Bus. $1.70 one way, like any local bus.
- How to pay. Tap a contactless credit or debit card, phone or watch at the fare gate or bus door, or use a CharlieCard or CharlieTicket.
- Kids. Children 11 and under ride the MBTA free.
Fares as of October 2026. Check the MBTA's fares page before you ride.
South Station to Castle Island: common questions
How do I get from South Station to Castle Island by public transit?
Take bus 7 to E Broadway @ Farragut Rd, and walk about 16 min. The trip takes about 30 minutes (27-32 min depending on the connection).
How long does it take to get from South Station to Castle Island?
About 30 minutes on the main route, or 27-32 minutes depending on the connection.
Do I have to change buses?
No. Bus 7 goes all the way, so it's one ride.
How often does bus 7 run?
Every 6 min on weekdays during the day and about every 40 min on Saturdays, on the fall 2026 schedule.
What time is the last bus from South Station to Castle Island?
On weekdays, the last trip that works leaves Summer St @ South Station - Red Line entrance at 1:17 am and gets to Castle Island around 1:52 am, using bus 11. On Saturday nights the last trip leaves at 1:05 am, and on Sunday nights at 1:12 am.
Related routes
- South Station to L Street Beach
- South Station to Leader Bank Pavilion
- North Station to Castle Island
- Back Bay Station to Castle Island
- Never miss your stop (guide)
More routes from South Station
- South Station to Logan Airport
- South Station to JFK Presidential Library
- South Station to Boston Convention and Exhibition Center
- South Station to the Seaport
- South Station to Carson Beach
- All routes from South Station
Official sources
Cobblehop is independent and isn't affiliated with these agencies or operators. Schedules on this page come from MBTA/MassDOT public data. Check their pages for the latest schedules and service changes:
Published October 30, 2026. Times were computed from the fall 2026 MBTA schedule (2026-11-04 for weekdays). Service changes, so check Cobblehop for live times before you go.
Leaving now? Cobblehop gives you one clear plan with live times and alerts you before your stop. No sign-up, nothing to install.