Are there nonstop flights from St Louis (STL) to Halifax (YHZ)?

No. The fastest connection is via Detroit, about 3h 44m of total flying time.

What is the fastest connection from St Louis (STL) to Halifax (YHZ)?

via Detroit ≈ 3h 44m, via Toronto ≈ 3h 45m, via Boston ≈ 3h 46m (estimated flying time, excluding layovers).

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

St. Louis Lambert International Airport (STL) to Halifax / Stanfield International Airport (YHZ)・2,316 km

No nonstop flights. The fastest connection is via Detroit (DTW), about 3h 44m of flying time (layover not included).

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

None.

12 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.