Are there nonstop flights from Bangkok (BKK) to London (STN)?

No. The fastest connection is via Amsterdam, about 12h 12m of total flying time.

What is the fastest connection from Bangkok (BKK) to London (STN)?

via Amsterdam ≈ 12h 12m, via Copenhagen ≈ 12h 15m, via Vienna ≈ 12h 24m (estimated flying time, excluding layovers).

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

Suvarnabhumi Airport (BKK) to London Stansted Airport (STN)・9,519 km

No nonstop flights. The fastest connection is via Amsterdam (AMS), about 12h 12m 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.

17 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.