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

No. The fastest connection is via Amsterdam, about 11h 28m of total flying time.

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

via Amsterdam ≈ 11h 28m, via Frankfurt am Main ≈ 11h 47m, via Zurich ≈ 12h 11m (estimated flying time, excluding layovers).

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

London City Airport (LCY) to Incheon International Airport (ICN)・8,835 km

No nonstop flights. The fastest connection is via Amsterdam (AMS), about 11h 28m of flying time (layover not included).

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

None.

5 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.