It's about 52 miles, about an hour and a half driving in standard traffic conditions, but since part of your route would be on the M25 orbital motorway if the traffic is bad - which it often is - it could take a lot longer.
If you don't have to drive it, you can do it more easily in about an hour on public transport. Take the train from Gatwick airport to London Bridge station (30 mins) . Change to the underground and take the Jubilee Line (direction Stratford) to Canning Town, (15 mins) then change at Canning Town onto the Docklands Light Railway which will take you to London City airport (7 mins).
993 miles Gatwick Airport (LGW) London to Almería Airport (LEI)
about 35 miles
The driving distance from Malaga, Spain to London Gatwick Airport is 2274km. By air the distance is 1639km
The distance between Oxford, United Kingdom and London Gatwick Airport is 62.16 miles or 100 about kilometers. The driving time is about 1 hour 10 minutes.
The driving distance from London Gatwick Airport to Newbury, United Kingdom is 77 miles / 124 km
The flight distance from London Gatwick Airport to Panama is 5,297 miles / 8,524 km
The flight distance from London Gatwick Airport to Tokyo, Japan is 5,978 miles / 9,621 km.
The distance between London Gatwick Airport and London Heathrow Airport is approximately 25 miles (40 kilometers) by road. However, this distance can vary depending on the specific route taken.
From London Gatwick Airport to Reading, Berkshire, uk:The distance between the starting location and the destination is 57mi, (91.8km), and will take approximately 1 hour 15 minutes of driving time.
about 30 miles
The driving distance from Wembley, Greater London, UK to Gatwick Airport (LGW), West Sussex RH6 0NP, UK is 50.5mi / 81.2km
The flight distance from London Gatwick Airport to Malaga, Spain is 1,018 miles / 1,639 km