Are there nonstop flights from Nanning (NNG) to London (LHR)?

No. The fastest connection is via Chengdu, about 11h 56m of total flying time.

What is the fastest connection from Nanning (NNG) to London (LHR)?

via Chengdu ≈ 11h 56m, via Chongqing ≈ 12h, via Hanoi ≈ 12h 12m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

Nanning Wuxu International Airport (NNG) to London Heathrow Airport (LHR)・9,262 km

No nonstop flights. The fastest connection is via Chengdu (TFU), about 11h 56m of flying time (layover not included).

With milesANA 30,000 miles+ (via TFU)JAL 45,000 miles+ (via PVG)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.