Which departure time was most reliable for GRR to DEN?
Among qualifying GRR-to-DEN departure window results, Early morning had the highest on-time rate: 87.5% of 337 flights. Evening was lowest at 67.9% across 168 flights.
| Departure window | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Early morning | 337 | 87.5% | 7.4% | 0.9% |
| Late morning | 238 | 78.6% | 14.3% | 0.4% |
| Afternoon | 490 | 74.5% | 12.7% | 0.2% |
| Evening | 168 | 67.9% | 22.6% | 0.0% |
Which weekday was most reliable for GRR to DEN?
Among qualifying GRR-to-DEN weekday results, Tuesday had the highest on-time rate: 81.4% of 156 flights. Monday was lowest at 73.5% across 185 flights.
| Day | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| Monday | 185 | 73.5% | 12.4% | 1.1% |
| Tuesday | 156 | 81.4% | 11.5% | 0.0% |
| Wednesday | 165 | 75.8% | 18.8% | 0.0% |
| Thursday | 166 | 79.5% | 12.7% | 0.6% |
| Friday | 186 | 79.6% | 10.2% | 0.0% |
| Saturday | 192 | 78.1% | 13.5% | 1.0% |
| Sunday | 188 | 77.1% | 12.2% | 0.0% |
Which airline was most reliable for GRR to DEN?
Among qualifying GRR-to-DEN airline results, United Airlines had the highest on-time rate: 78.8% of 728 flights. Frontier Airlines was lowest at 74.0% across 146 flights.
| Airline | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| United Airlines | 728 | 78.8% | 12.2% | 0.5% |
| Southwest Airlines | 363 | 77.1% | 12.1% | 0.3% |
| Frontier Airlines | 146 | 74.0% | 19.2% | 0.0% |
| SkyWest Airlines | 1 | 100.0% | 0.0% | 0.0% |
Which month was most reliable for GRR to DEN?
Among qualifying GRR-to-DEN month results, October 2025 had the highest on-time rate: 90.1% of 111 flights. January 2026 was lowest at 56.7% across 97 flights.
| Month | Flights | On time | 30+ min | Cancelled |
|---|---|---|---|---|
| July 2025 | 122 | 80.3% | 11.5% | 1.6% |
| August 2025 | 121 | 81.8% | 14.9% | 0.0% |
| September 2025 | 114 | 86.8% | 7.9% | 0.0% |
| October 2025 | 111 | 90.1% | 4.5% | 0.0% |
| November 2025 | 102 | 88.2% | 5.9% | 0.0% |
| December 2025 | 102 | 66.7% | 18.6% | 0.0% |
| January 2026 | 97 | 56.7% | 30.9% | 1.0% |
| February 2026 | 84 | 76.2% | 14.3% | 1.2% |
| March 2026 | 70 | 78.6% | 12.9% | 0.0% |
| April 2026 | 95 | 83.2% | 6.3% | 0.0% |
| May 2026 | 106 | 77.4% | 12.3% | 0.0% |
| June 2026 | 114 | 64.9% | 17.5% | 0.9% |
What drove GRR to DEN delay minutes?
Airline was the largest recorded GRR-to-DEN delay category, accounting for 35.3% of 18,965 BTS-attributed delay minutes during July 2025–June 2026.
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