Most delayed flights from GTF: every route ranked

2 regularly flown nonstop routes from Great Falls International 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	GTF → DEN Denver, CO	86%	1.0%	16 min	2	728
2	GTF → SLC Salt Lake City, UT	92%	0.7%	6 min	1	1,071

Less frequent routes

Too few flights for a reliable ranking.

GTF → LAS (Las Vegas) 111 flts
GTF → SEA (Seattle) 106 flts
GTF → AZA (Phoenix) 91 flts
GTF → MSP (Minneapolis) 38 flts
GTF → ORD (Chicago) 23 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.