Guide de ville
Boston BOS: What to Do on a Layover
Freedom Trail in 3 hours: Paul Revere's house, clam chowder in a bowl, harbor walk.
Getting from the airport
BOS to city center: 34 minutes by bus (Portland, ME to Boston / South Station, MA). Trains run every 22 minutes. Service runs 05:00 to 22:00. Skip the taxi unless your connection is under 5 hours.
What to do in Boston
The stops worth making: Freedom Trail, Fenway Park, Quincy Market clam chowder, Harvard & MIT walk. Rated above 4.4: Fenway Park (4.8), Boston Common (4.7), Museum of Fine Arts, Boston (4.8), New England Aquarium (4.4), Faneuil Hall Marketplace (4.5). You do not need the full tourist circuit. Pick two and commit.
Visa and entry
Boston is visa-free for US passports. No application, no fee. The border process at BOS is standard. Budget 30 minutes.
How long do you need
The minimum useful layover is 4 hours. That gives you 34 minutes in each direction plus about 82 minutes on the ground. Up to 24 hours is a proper overnight.
BOS airport
BOS has 8 lounges. For short connections under 4 hours, the terminal is the destination: food options, showers, and enough space to reset before the next leg.