Are there nonstop flights from Porto (OPO) to London (STN)?

Yes. Ryanair fly this route. Flight time is about 2h 6m.

What is the fastest connection from Porto (OPO) to London (STN)?

via Nantes ≈ 2h 39m, via Tours ≈ 2h 47m, via Paris ≈ 2h 52m (estimated flying time, excluding layovers).

from 15,000 ANA miles, from 15,000 JAL miles (economy, one way, based on the published award charts).

Francisco de Sá Carneiro Airport (OPO) to London Stansted Airport (STN)・1,363 km

Nonstop flights available (1 airline). Flight time about 2h 6m. Nonstop return flights also operate.

With milesANA 15,000 miles+ (via MUC)JAL 15,000 miles+ (via CMN)Economy, one way, estimate. Tap a connection for miles by cabin.

54 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.