Are there nonstop flights from Singapore (SIN) to London (STN)?

No. The fastest connection is via Amsterdam, about 13h 44m of total flying time.

What is the fastest connection from Singapore (SIN) to London (STN)?

via Amsterdam ≈ 13h 44m, via Copenhagen ≈ 13h 49m, via Vienna ≈ 13h 52m (estimated flying time, excluding layovers).

from 29,500 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

Singapore Changi Airport (SIN) to London Stansted Airport (STN)・10,827 km

No nonstop flights. The fastest connection is via Amsterdam (AMS), about 13h 44m of flying time (layover not included).

With milesANA 29,500 miles+ (via MUC)JAL 45,000 miles+ (via DXB)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

14 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.