The Severn Tunnel, which the Great Western Railway operates through between London Paddington and South Wales, is to close for six weeks from Monday 12 September 2016 and Friday 21 October 2016.
As a consequence of the closure trains will be diverted and journey times from London Paddington to South Wales will increase by up to 40 minutes.
In response, Flybe has launched a temporary service between London City airport and Cardiff airport from 12 September 2016 to 21 October 2016.
Flights will operate up to four times daily on weekdays and twice daily on Saturdays and Sundays. Flights will be operated by VLM Airlines on behalf of Flybe.
Flights are on sale now and a full timetable is available from Flybe.
This is not the first scheduled passenger service between London City and Cardiff. Air Wales operated a short-lived service between London City, Cardiff and Swansea airports in 2006.