Route profile
DEN→GTF
Flight reliability, delays and best times to fly from Denver to Great Falls. · 623 miles
Right now
Current conditions at both ends of this route.
Aviation weather is not currently a factor.
FlyerIntel does not currently have live operational data for this airport.
Airport conditions describe the airfield, not any individual flight. An airport operating normally is not a guarantee that a specific flight will depart on time.
Route reliability
July 2023 – June 2026
Better than 45% of comparable major US routes (4,577 compared)
Calculated from 2,189 flights. How this is calculated
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – June 2026
Airlines on this route
Performance by the carrier that actually operated the flight.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| United Airlines | 1,110 | 73.4% | 0.54% | -4 min | 11.9% |
| SkyWest Airlines | 1,079 | 84.2% | 1.20% | -6 min | 5.4% |
SkyWest Airlines arrived on time 10.8 percentage points more often than United Airlines on this route.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026 · Carriers with fewer than 200 flights on this route are not listed.
Weekly and seasonal patterns
By day of week
Sunday is historically the most reliable day and Saturday the least, a gap of 3.8 percentage points.
By month
June is historically the weakest month and December the strongest, a spread of 29.8 percentage points.
Historical trend
On-time arrival rate by month.
Over the most recent 12 months (2025-07 to 2026-06), on-time arrivals averaged 77.7% against 80.2% in the 12 months before — declining by 2.5 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026
Data and methodology
All figures on this page are calculated by FlyerIntel from 2,189 DEN → GTF flight records published by the US DOT Bureau of Transportation Statistics, covering July 2023 – June 2026. A flight is counted as delayed when it arrives 15 or more minutes after its scheduled arrival time, following BTS methodology. Cancelled and diverted flights have no arrival time and are excluded from on-time rates rather than counted as late.
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