Best Time to Fly GTF to DEN: On-Time Stats by Hour & Airline
Great Falls International → Denver International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.7% of Great Falls (GTF) to Denver (DEN) flights arrived on time (728 scheduled flights). That is 8.1 points above the national average of 77.6%.
Among 2 airlines, SkyWest Airlines led with 91.5% on time and United Airlines was last with 83.5%.
Over 24 months, Sunday was the most reliable day (87% on time) and June the worst month (72%).
The cancellation rate was 1.0% (US average 1.8%).
GTF to DEN on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlines | 91.5% | 121 min | 1.0% | 201 |
| United Airlines | 83.5% | 107 min | 0.9% | 527 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly GTF to DEN
On-time arrival % by scheduled departure hour (local time), 1,457 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 91.1% | 0.7% | 587 |
| 7am–8am | 90.1% | 1.4% | 143 |
| 2pm–3pm | 78.1% | 0.6% | 727 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on GTF to DEN
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 26 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 90.0% | +3.9 pts | 0.0% | 60 |
| Summer peak (Jun 15 - Aug 15) | 76.9% | -9.2 pts | 0.8% | 247 |
| All other days | 86.1% | — | 0.7% | 1,124 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).