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.
On 25 July 1951, the route was revised in order to operate from Twickenham station to Hatton Cross via Hounslow West station.
On 3 December 1952, the route was extended from Hatton Cross to Bedfont Green and Staines via Stanwell.
On 26 September 1970, the route was withdrawn between Twickenham and Hounslow.
On 19 July 1975, the route was diverted in order to serve the new Hatton Cross station.
On 28 January 1978, the route was extended from Hounslow to Brentford.
On 9 August 1986, the route passed to Westlink.
On 10 August 1991, the route passed to London Buslines and was withdrawn between Hounslow and Brentford.
In March 1996, the route was included in the sale of London Buslines to CentreWest.
On 1 September 2001, the route passed to Tellings-Golden Miller operating from their Twickenham (TF) garage using Plaxton Pointer bodied Dennis Dart SLFs.
In September 2005, the route was included sale of Tellings-Golden Miller to Travel London.
On 3 September 2011, the route was retained by London United using brand new Mercedes-Benz O530Gs.
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