Are there nonstop flights from London (STN) to Philadelphia (PHL)?

No. The fastest connection is via Dublin, about 7h 44m of total flying time.

What is the fastest connection from London (STN) to Philadelphia (PHL)?

via Dublin ≈ 7h 44m, via Edinburgh ≈ 7h 55m, via Amsterdam ≈ 8h 25m (estimated flying time, excluding layovers).

from 40,000 JAL miles (economy, one way, based on the published award charts).

London Stansted Airport (STN) to Philadelphia International Airport (PHL)・5,721 km

No nonstop flights. The fastest connection is via Dublin (DUB), about 7h 44m of flying time (layover not included).

With milesJAL 40,000 miles+ (via NCE)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

17 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.