According to Official Guinness Records,
The greatest horizontal distance flown in a wingsuit is 30.406 km (18.89 miles), and was achieved by Kyle Lobpries (USA) in Davis, California, USA, on 30 May 2016.Kyle's flight lasted 8 minutes and 27 seconds before he deployed his parachute at 915 metres.
For a complete list of 2016 records, please visit 2016 Guinness Records in United States.