Are there nonstop flights from London (STN) to Bucharest (BBU)?

No. The fastest connection is via Budapest, about 3h 26m of total flying time.

What is the fastest connection from London (STN) to Bucharest (BBU)?

via Budapest ≈ 3h 26m, via Frankfurt am Main ≈ 3h 27m, via Rheinmünster ≈ 3h 28m (estimated flying time, excluding layovers).

London Stansted Airport (STN) to Bucharest Băneasa Aurel Vlaicu International Airport (BBU)・2,072 km

No nonstop flights. The fastest connection is via Budapest (BUD), about 3h 26m of flying time (layover not included).

None.

15 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.