It includes toilets, an enclosed waiting area and digital information screens which provide real-time journey information.
The car park capacity has also been increased by 595 spaces taking the number of spaces for vehicles to more than 1,300.
The improvements were made possible thanks to a multi-million pound investment by Oxford City Council.
Seacourt Park & Ride off Botley Road is one of five car parks located on Oxford’s ring road which provide parking and bus journeys into the city centre.
The 400 service operates between Seacourt, Oxford and Thornhill daily. Oxford Bus Company operates all Park & Ride bus services to the City Centre, which are designed to help reduce city centre emissions and congestion.