Plans to scrap the 13 bus route, serving the JW3 community centre from Golders Green, have been shelved following the intervention of Boris Johnson and other politicians.
During a consultation process, many JW3 members also made clear their need for the service to Transport for London.
A spokesperson said Mr Johnson was "not persuaded by the argument that the route should be replaced and has pledged that it will remain in operation and continue to serve those who rely on it".
TfL's head of consultations, Peter Bradley, said: "The comments received from this consultation will be used to inform future bus network planning in the Finchley Road and Abbey Road areas.
"Any resulting proposals would be subject to further public consultation."
Boris Johnson wanted the service to continue
The change of heart "delighted" the JW3 chief executive, Raymond Simonson. "This bus route gives easy access to JW3 from both central London and areas of London with the highest Jewish population," he said. "It particularly helps the elderly, parents with small children and people with disabilities.
"It was great to see the community mobilised, with thousands of JW3 members taking part in the public consultation, and significant support from the London Jewish Forum and election candidates. The number 13 is used by many of our visitors, ensuring their journey here is quick and easy."