Are there nonstop flights from Halifax (YHZ) to Porto (OPO)?

No. The fastest connection is via Lisbon, about 6h 36m of total flying time.

What is the fastest connection from Halifax (YHZ) to Porto (OPO)?

via Lisbon ≈ 6h 36m, via Dublin ≈ 7h 29m, via Boston ≈ 7h 43m (estimated flying time, excluding layovers).

from 27,500 ANA miles (economy, one way, based on the published award charts).

Halifax / Stanfield International Airport (YHZ) to Francisco de Sá Carneiro Airport (OPO)・4,387 km

No nonstop flights. The fastest connection is via Lisbon (LIS), about 6h 36m of flying time (layover not included).

With milesANA 27,500 miles+ (via YUL)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

14 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.