Are there nonstop flights from Espargos (SID) to London (STN)?

No. The fastest connection is via Porto, about 6h 11m of total flying time.

What is the fastest connection from Espargos (SID) to London (STN)?

via Porto ≈ 6h 11m, via Lisbon ≈ 6h 12m, via Gran Canaria ≈ 6h 12m (estimated flying time, excluding layovers).

from 23,000 JAL miles (economy, one way, based on the published award charts).

Amílcar Cabral International Airport (SID) to London Stansted Airport (STN)・4,409 km

No nonstop flights. The fastest connection is via Porto (OPO), about 6h 11m of flying time (layover not included).

With milesJAL 23,000 miles+ (via CMN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

19 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.