New York City Transit (MTA) operates a train from Manhattan to Lambertville every 10 minutes. Tickets cost $3 and the journey takes 9 min. Amtrak Northeast Regional also services this route hourly. Alternatively, Trans-bridge Lines operates a bus from Manhattan to Lambertville 4 times a day. Tickets cost $25 - $45 and the journey takes 1 h 59 min.
From 86 St subway to New York Penn Station, train to Trenton Transit Center Amtrak, then taxi to Lambertville. 1 h 47 min $182. From New York bus to Lambertville, New Jersey. 1 h 59 min $41. From Manhattan drive to Lambertville. 1 h 24 min $8.