Best Time to Fly GRR to DEN: On-Time Stats by Hour & Airline
Gerald R. Ford International → Denver International
Data through July 2026 · Last updated October 18, 2026
1,234 flights were scheduled from Grand Rapids (GRR) to Denver (DEN) in the last 12 months, and 77.6% of those that flew arrived on time, in line with the US average of 77.6%.
Frontier Airlines was the most punctual of the 3 airlines on the route at 80.0%, while Southwest Airlines trailed at 75.1%.
October has been the best month (91% on time) and Wednesday the weakest day of the week (78%).
0.3% of flights were cancelled, versus 1.8% nationally.
GRR 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 |
|---|---|---|---|---|
| Frontier Airlines | 80.0% | 94 min | 0.0% | 147 |
| United Airlines | 78.3% | 86 min | 0.4% | 727 |
| Southwest Airlines | 75.1% | 60 min | 0.3% | 359 |
| SkyWest Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly GRR to DEN
On-time arrival % by scheduled departure hour (local time), 2,511 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 87.8% | 2.0% | 50 |
| 6am–7am | 91.7% | 0.0% | 36 |
| 7am–8am | Limited data | 25 | |
| 8am–9am | 88.8% | 0.6% | 493 |
| 9am–10am | 82.0% | 0.2% | 417 |
| 10am–11am | Limited data | 8 | |
| 11am–12pm | 86.1% | 0.0% | 36 |
| 12pm–1pm | 83.3% | 0.0% | 90 |
| 1pm–2pm | Limited data | 12 | |
| 2pm–3pm | 85.4% | 0.0% | 41 |
| 3pm–4pm | 76.0% | 0.2% | 823 |
| 4pm–5pm | 68.2% | 0.0% | 126 |
| 5pm–6pm | 58.3% | 0.0% | 48 |
| 6pm–7pm | Limited data | 26 | |
| 7pm–8pm | 70.6% | 0.0% | 51 |
| 8pm–9pm | 73.8% | 0.5% | 205 |
| 9pm–10pm | Limited data | 24 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on GRR 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) | 59.2% | -22.0 pts | 0.0% | 49 |
| Christmas & New Year (Dec 20 - Jan 3) | 72.9% | -8.3 pts | 0.0% | 107 |
| Summer peak (Jun 15 - Aug 15) | 77.2% | -4.0 pts | 1.0% | 485 |
| All other days | 81.2% | — | 0.2% | 1,870 |
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).