London Buses route 203 is a Transport for London contracted bus route in London, England. Running between Hounslow and Staines, it is operated by London United.
Route 203 commenced operating on 21 February 1951 between Hounslow Central station and Hanworth. From 25 July 1951, it was revised to operate from Twickenham station to Hatton Cross via Hounslow West station.
It was extended from Hatton Cross to Bedfont Green on 3 December 1952 and Staines via Stanwell from 4 May 1955.
On 26 September 1970, route 203 was withdrawn between Twickenham and Hounslow. On 19 July 1975, it was diverted to serve the new Hatton Cross station. From 28 January 1978, it was extended from Hounslow to Brentford.
On 9 August 1986, it passed to Westlink. It passed to London Buslines on 10 August 1991, with the Hounslow to Brentford section withdrawn. Route 203 was included in the March 1996 sale of London Buslines to CentreWest.
On 1 September 2001, the route passed to Tellings-Golden Miller with Plaxton Pointer 2 bodied Dennis Dart SLFs from Twickenham (TF) garage. Route 203 was included in the September 2005 sale of Tellings-Golden Miller to Travel London.
On 3 September 2011, the route was retained by London United with new Mercedes-Benz O530 Citaros.
On 3 September 2016, the route was retained by London United.
- Hounslow High Street, School Road
- Hounslow West Station
- Hatton Cross Station
- Ashford Hospital
- Staines Bus Station