Are there nonstop flights from New York (LGA) to Helena (HLN)?

No. The fastest connection is via Denver, about 5h 11m of total flying time.

What is the fastest connection from New York (LGA) to Helena (HLN)?

via Denver ≈ 5h 11m, via Salt Lake City ≈ 5h 31m (estimated flying time, excluding layovers).

LaGuardia Airport (LGA) to Helena Regional Airport (HLN)・3,100 km

No nonstop flights. The fastest connection is via Denver (DEN), about 5h 11m of flying time (layover not included).

None.

2 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.