Most delayed flights from HLN: every route ranked

2 regularly flown nonstop routes from Helena Regional Airport, worst on-time record first (Aug 2025 – Jul 2026). Routes with fewer than 360 flights in the period are listed separately.

#	Destination	On time	Cancelled	Avg delay	Airlines	Flights
1	HLN → DEN Denver, CO	82%	0.5%	20 min	1	814
2	HLN → SLC Salt Lake City, UT	95%	0.3%	4 min	1	725

Less frequent routes

Too few flights for a reliable ranking.

HLN → SEA (Seattle) 10 flts

Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.