Are there nonstop flights from London (STN) to São Paulo (GRU)?

No. The fastest connection is via Porto, about 12h 13m of total flying time.

What is the fastest connection from London (STN) to São Paulo (GRU)?

via Porto ≈ 12h 13m, via Lisbon ≈ 12h 15m, via Madrid ≈ 12h 23m (estimated flying time, excluding layovers).

from 35,000 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

London Stansted Airport (STN) to São Paulo/Guarulhos–Governor André Franco Montoro International Airport (GRU)・9,526 km

No nonstop flights. The fastest connection is via Porto (OPO), about 12h 13m of flying time (layover not included).

With milesANA 35,000 miles+ (via MUC)JAL 45,000 miles+ (via CMN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

13 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.