Are there nonstop flights from Riga (RIX) to Porto (OPO)?

Yes. AirBaltic fly this route. Flight time is about 3h 55m.

What is the fastest connection from Riga (RIX) to Porto (OPO)?

via Düsseldorf ≈ 4h 25m, via Paris ≈ 4h 25m, via Charleroi ≈ 4h 25m (estimated flying time, excluding layovers).

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

Riga International Airport (RIX) to Francisco de Sá Carneiro Airport (OPO)・2,903 km

Nonstop flights available (1 airline). Flight time about 3h 55m. Nonstop return flights also operate.

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

56 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.