London Buses route 403 is a Transport for London contracted bus route in London, England. Running between Warlingham and West Croydon, it is operated by Arriva London.
Route 403 commenced operation on 1 December 1924. It was operated by East Surrey Transport. By 1 January 1932. the route was being operated by [[London General. From 1 July 1933 until 21 December 1969 London Transport operated the route. From 1 July 1970 the route was operated by London Country Bus Services.
On 9 August 1986, route 403 became a London Regional Transport route operated by London Country South West operating from their Chelsham (CM) garage using Leyland Atlanteans. The route ran between Cheam and Tatsfield.
On 31 August 1991, the route was withdrawn between Cheam and West Croydon Station being replaced by route 407.
On 29 October 1994, the route was withdrawn between Warlingham Park Hospital and Tatfield with the route passing to London & Country operating from their Croydon (CR) garage using East Lancs bodied Volvo Olympians.
on 30 October 1999, the route passed to Arriva London operating from their Beddington Garage (BF) using Leyland Olympians.
On 16 December 2000, the route was withdrawn between West Croydon Station and Walingham Park Hospital.
On 30 October 2004, the route was converted to Low floor Double Deck operation using Wright Pulsar Gemini bodied DAF DB250LFs.
On 29 October 2011, the allocation was transferred to Croydon (TC) Garage.
In October 2017, the Wright Pulsar Gemini bodied DAF DB250LFs were replaced by Wright Gemini 2 bodied VDL DB300s.
Route 403 operates via these primary locations:
- Sanderstead Station
- South Croydon
- West Croydon Station