Are there nonstop flights from London (STN) to Castellón de la Plana (CDT)?

Yes. Ryanair fly this route. Flight time is about 2h 2m.

What is the fastest connection from London (STN) to Castellón de la Plana (CDT)?

via Madrid ≈ 2h 54m, via Palma de Mallorca ≈ 2h 55m, via Bergamo ≈ 3h 19m (estimated flying time, excluding layovers).

London Stansted Airport (STN) to Castellón-Costa Azahar Airport (CDT)・1,298 km

Nonstop flights available (1 airline). Flight time about 2h 2m. Nonstop return flights also operate.

7 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.