Free ride from any BOS terminal to South Station
The MBTA Silver Line SL1 runs free from Logan to South Station, and that single ride from Terminals A, B, C, or E takes you straight to South Station and the Seaport with no transfers. It’s a bus rapid transit line, not a train, even though on MBTA maps it looks like a silver subway route.
SL1 stops are at each terminal curbside, clearly marked “Silver Line SL1,” and the buses run every few minutes most of the day, so headways are short enough that you usually don’t stare at the curb for more than 5–10 minutes. The run to South Station is often 20–25 minutes off‑peak, but weekday late‑afternoon traffic in the Seaport can stretch that. Compared with a $30–40 Uber to downtown, the fare of $0 inbound from Logan is hard to beat.
From Logan to South Station the ride is free; you only pay when going the other way from South Station back to the airport, when a normal MBTA fare applies. Buses load from the front door, luggage goes into the low‑floor area, and drivers see a lot of first‑timers stepping on with suitcases headed to Amtrak or Acela at South Station. For hotels around Congress Street or the convention center in the Seaport, SL1 puts you within a short walk of many big chains.
Watch out for peak times: r/boston commuters call SL1 “jam‑packed” after evening flight banks out of Terminal C and Terminal E, with people standing in the aisles and bags stacked by the doors. The Seaport portion runs in mixed traffic and hits multiple signals, so at 5–7 p.m. the same ride that took 18 minutes at 11 a.m. can feel “slow as molasses” and push past 35 minutes.
Regulars treat SL1 like a frequent shuttle: if a bus pulls up already wall‑to‑wall, they just let it go and grab the next one 5–8 minutes later, which is often noticeably less crowded. Locals with tight Amtrak departures at South Station around the :30 mark will sometimes skip SL1 entirely and pay for a taxi when a missed train means a 2–3 hour wait.
Quick tip: If you land at BOS and see both SL1 and SL3 listed, pick SL1 for South Station and the Seaport; SL3 does not go to South Station and will not help with Amtrak or intercity bus connections.