Are there nonstop flights from Sapporo (CTS) to London (LHR)?

No. The fastest connection is via Seoul, about 13h 5m of total flying time.

What is the fastest connection from Sapporo (CTS) to London (LHR)?

via Seoul ≈ 13h 5m, via Tokyo ≈ 13h 15m, via Shanghai ≈ 14h 26m (estimated flying time, excluding layovers).

from 22,500 ANA miles, from 27,000 JAL miles (economy, one way, based on the published award charts).

New Chitose Airport (CTS) to London Heathrow Airport (LHR)・8,918 km

No nonstop flights. The fastest connection is via Seoul (ICN), about 13h 5m of flying time (layover not included).

With milesANA 22,500 miles+ (via HND)JAL 27,000 miles+ (via HND)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

8 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.