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Its number was previously used by a trolleybus route over the same roads, which operated from 15 November 1936 until 8 November 1960 when it was abolished as part of the London Trolleybus Withdrawal Programme and replaced by bus route 207. It was the only regular route in the 6xx series that is otherwise reserved for school routes. (There had been 6xx limited-stop routes in the 1970s.)
In the early 2000s, it was proposed that the route be replaced by the West London Tram, however this project was abandoned in 2007. On 29 November 2008, route 607 was extended from Shepherd's Bush Green to White City bus station to coincide with the opening of Westfield London.
On 22 June 2013, route 607 was included in the sale of First London's Uxbridge garage to Metroline. In April 2019, Metroline commenced a new contract.
SL8
On 15 July 2023, route 607 was renumbered SL8, becoming part of the Superloop network of orbital express bus routes.
On 19 August 2023, the hours of operation were extended.