Are there nonstop flights from London (STN) to San José (SJO)?

No. The fastest connection is via Paris, about 11h 56m of total flying time.

What is the fastest connection from London (STN) to San José (SJO)?

via Paris ≈ 11h 56m, via Amsterdam ≈ 12h 2m, via Madrid ≈ 12h 32m (estimated flying time, excluding layovers).

London Stansted Airport (STN) to Juan Santamaría International Airport (SJO)・8,755 km

No nonstop flights. The fastest connection is via Paris (CDG), about 11h 56m of flying time (layover not included).

None.

4 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.