GoToBus, an internet travel agency, is now offering a direct bus trip from Cambridge to New York. A one-way ticket will cost you $20 and roundtrip tickets currently cost $40. That's a lot cheaper than a plane ticket.

Once the service starts operating regularly on Dec. 4, buses will leave Cambridge at 1 Bennett St. (near the Charles Hotel) on Friday at 7 a.m., 1 p.m., and 5 p.m, on Saturday at 7 a.m., and on Sunday at 7 a.m., 1 p.m., and 5 p.m., according to Amy Veiga, the marketing manager for GoToBus.

The New York City bus stop is at the intersection of 9th Avenue and 42nd Street. The bus will leave NYC on Fridays at 9:30 a.m., 4:30 p.m., 7:30 p.m., on Saturdays at 7:30 p.m., and on Sunday at 9:30 a.m., 4:30 p.m., and 7:30 p.m.

The bus will also run Nov. 25, the day before Thanksgiving. Seats are still available, according to Veiga. They will leave Cambridge at 7 a.m., 1 p.m., and 5 p.m. There will be a return bus leaving New York City Sunday at 9:30 a.m., 4:30 p.m., and 7:30 p.m.

The new service is offered in cooperation with Azumah Bus.