Are there nonstop flights from London (STN) to Rio De Janeiro (GIG)?

No. The fastest connection is via Porto, about 11h 58m of total flying time.

What is the fastest connection from London (STN) to Rio De Janeiro (GIG)?

via Porto ≈ 11h 58m, via Lisbon ≈ 12h, via Madrid ≈ 12h 7m (estimated flying time, excluding layovers).

from 50,000 JAL miles (economy, one way, based on the published award charts).

London Stansted Airport (STN) to Rio de Janeiro Galeão – Tom Jobim International Airport (GIG)・9,319 km

No nonstop flights. The fastest connection is via Porto (OPO), about 11h 58m of flying time (layover not included).

With milesJAL 50,000 miles+ (via DXB)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

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.