National Express operates a bus from Cambridge to Boston 4 times a day. Tickets cost $8 - $12 and the journey takes 50 min. National Express also services this route twice daily. Alternatively, CrossCountry operates a train from Cambridge to Boston hourly. Tickets cost $35 - $60 and the journey takes 48 min. 2 other operators also service this route.
From Cambridge train to Peterborough then bus to Boston. 3 h 8 min £44. From Cambridge bus to Peterborough then bus to Boston. 3 h 10 min £15. From Cambridge train to Peterborough, train to Grantham, then train to Boston. 3 h 26 min £65. From Drummer St Bus Station bus to Huntingdon, Railway Station (Railway Station Car Park), bus to Peterborough, Queensgate Bus Stn (Bay 16), bus to Spalding, Bus Station, bus to Wyberton, Pincushion Inn, then bus to Boston, Bus Station. 4 h 59 min £30. From Cambridge drive to Boston. 1 h 20 min £13.