Are there nonstop flights from London (LGW) to Johannesburg (JNB)?

No. The fastest connection is via Paris, about 11h 39m of total flying time.

What is the fastest connection from London (LGW) to Johannesburg (JNB)?

via Paris ≈ 11h 39m, via Algiers ≈ 11h 42m, via Zurich ≈ 11h 47m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 37,000 JAL miles (economy, one way, based on the published award charts).

London Gatwick Airport (LGW) to O.R. Tambo International Airport (JNB)・9,035 km

No nonstop flights. The fastest connection is via Paris (CDG), about 11h 39m of flying time (layover not included).

With milesANA 30,000 miles+ (via ZRH)JAL 37,000 miles+ (via CDG)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

20 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.