Are there nonstop flights from London (STN) to Skiathos (JSI)?

Yes. Jet2.com fly this route. Flight time is about 3h 11m.

What is the fastest connection from London (STN) to Skiathos (JSI)?

via Venice ≈ 3h 41m, via Zurich ≈ 3h 42m, via Munich ≈ 3h 42m (estimated flying time, excluding layovers).

London Stansted Airport (STN) to Skiathos Island National Airport (JSI)・2,281 km

Nonstop flights available (1 airline). Flight time about 3h 11m. Nonstop return flights also operate.

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.