Are there nonstop flights from London (STN) to Catania (CTA)?

Yes. Ryanair, Jet2.com fly this route. Flight time is about 2h 50m.

What is the fastest connection from London (STN) to Catania (CTA)?

via Genova ≈ 3h 20m, via Turin ≈ 3h 20m, via Pisa ≈ 3h 20m (estimated flying time, excluding layovers).

from 15,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

London Stansted Airport (STN) to Catania-Fontanarossa Airport (CTA)・1,978 km

Nonstop flights available (2 airlines). Flight time about 2h 50m. Nonstop return flights also operate.

With milesANA 15,000 miles+ (via MUC)JAL 23,000 miles+ (via CMN)Economy, one way, estimate. Tap a connection for miles by cabin.

73 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.