Are there nonstop flights from London (STN) to Tenerife (TFS)?

Yes. Ryanair, Jet2.com, TUI Airways fly this route. Flight time is about 4h 2m.

What is the fastest connection from London (STN) to Tenerife (TFS)?

via Porto ≈ 4h 31m, via Santiago de Compostela ≈ 4h 32m, via Lisbon ≈ 4h 32m (estimated flying time, excluding layovers).

from 15,000 JAL miles (economy, one way, based on the published award charts).

London Stansted Airport (STN) to Tenerife Sur Airport (TFS)・2,997 km

Nonstop flights available (3 airlines). Flight time about 4h 2m. Nonstop return flights also operate.

With milesJAL 15,000 miles+ (via CMN)Economy, one way, estimate. Tap a connection for miles by cabin.

65 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.