Are there nonstop flights from London (LGW) to Guangzhou (CAN)?

Yes. China Southern Airlines fly this route. Flight time is about 11h 41m.

What is the fastest connection from London (LGW) to Guangzhou (CAN)?

via Amsterdam ≈ 12h 11m, via Chengdu ≈ 12h 12m, via Frankfurt am Main ≈ 12h 21m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 40,000 JAL miles (economy, one way, based on the published award charts).

London Gatwick Airport (LGW) to Guangzhou Baiyun International Airport (CAN)・9,499 km

Nonstop flights available (1 airline). Flight time about 11h 41m. Nonstop return flights also operate.

With milesANA 30,000 miles+ (via TFU)JAL 40,000 miles+ (via CMB)Economy, one way, estimate. Tap a connection for miles by cabin.

30 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.