Are there nonstop flights from Halifax (YHZ) to New York (LGA)?

Yes. American Eagle (airline brand), Delta Connection fly this route. Flight time is about 1h 38m.

What is the fastest connection from Halifax (YHZ) to New York (LGA)?

via Boston ≈ 2h 8m, via Montréal ≈ 2h 34m, via Washington ≈ 2h 56m (estimated flying time, excluding layovers).

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

Halifax / Stanfield International Airport (YHZ) to LaGuardia Airport (LGA)・959 km

Nonstop flights available (2 airlines). Flight time about 1h 38m. Nonstop return flights also operate.

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

6 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.