Are there nonstop flights from Calgary (YYC) to St. John's (YYT)?

Yes. WestJet fly this route. Flight time is about 5h 35m.

What is the fastest connection from Calgary (YYC) to St. John's (YYT)?

via Deer Lake ≈ 6h 5m, via Winnipeg ≈ 6h 11m, via Edmonton ≈ 6h 15m (estimated flying time, excluding layovers).

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

Calgary International Airport (YYC) to St. John's International Airport (YYT)・4,323 km

Nonstop flights available (1 airline). Flight time about 5h 35m. Nonstop return flights also operate.

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

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.