Details.
Same-day round-trip fares are $34 between Concord and Boston South Station, $47 between Portland and Boston South Station, $73 between Augusta and Boston South Station, and $84 between Bangor and Boston South Station. Tickets must be purchased in person at the terminal on the day of travel. No reservations are accepted. There are no blackout dates, including holidays. A photo ID is required at purchase, and passengers should arrive 30 minutes before departure.