Are there nonstop flights from Washington (DCA) to Porto (OPO)?

No. The fastest connection is via New York, about 7h 40m of total flying time.

What is the fastest connection from Washington (DCA) to Porto (OPO)?

via New York ≈ 7h 40m, via Newark ≈ 7h 41m, via Boston ≈ 7h 41m (estimated flying time, excluding layovers).

Ronald Reagan Washington National Airport (DCA) to Francisco de Sá Carneiro Airport (OPO)・5,669 km

No nonstop flights. The fastest connection is via New York (JFK), about 7h 40m of flying time (layover not included).

None.

5 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.