Are there nonstop flights from Seoul (ICN) to London (STN)?

No. The fastest connection is via Helsinki, about 11h 22m of total flying time.

What is the fastest connection from Seoul (ICN) to London (STN)?

via Helsinki ≈ 11h 22m, via Copenhagen ≈ 11h 24m, via Amsterdam ≈ 11h 26m (estimated flying time, excluding layovers).

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

Incheon International Airport (ICN) to London Stansted Airport (STN)・8,795 km

No nonstop flights. The fastest connection is via Helsinki (HEL), about 11h 22m of flying time (layover not included).

With milesANA 30,000 miles+ (via MUC)JAL 45,000 miles+ (via DXB)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

18 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.