Are there nonstop flights from London (STN) to Haikou (HAK)?

No. The fastest connection is via Dubai, about 14h 4m of total flying time.

What is the fastest connection from London (STN) to Haikou (HAK)?

via Dubai ≈ 14h 4m, via Madrid ≈ 14h 50m (estimated flying time, excluding layovers).

London Stansted Airport (STN) to Haikou Meilan International Airport (HAK)・9,576 km

No nonstop flights. The fastest connection is via Dubai (DXB), about 14h 4m of flying time (layover not included).

None.

2 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.