Are there nonstop flights from Oslo (OSL) to Porto (OPO)?

Yes. Norwegian Air Shuttle fly this route. Flight time is about 3h 27m.

What is the fastest connection from Oslo (OSL) to Porto (OPO)?

via London ≈ 3h 57m, via London ≈ 3h 57m, via Manchester ≈ 3h 59m (estimated flying time, excluding layovers).

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

Oslo-Gardermoen International Airport (OSL) to Francisco de Sá Carneiro Airport (OPO)・2,504 km

Nonstop flights available (1 airline). Flight time about 3h 27m. Nonstop return flights also operate.

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

63 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.