Best Time to Fly COS to DEN: On-Time Stats by Hour & Airline
City of Colorado Springs Municipal → Denver International
Data through July 2026 · Last updated October 18, 2026
5,008 flights were scheduled from Colorado Springs (COS) to Denver (DEN) in the last 12 months, and 80.5% of those that flew arrived on time, 2.9 points above the US average of 77.6%.
Among 3 airlines, SkyWest Airlines led with 83.0% on time and United Airlines was last with 74.0%.
Over 24 months, Sunday was the most reliable day (80% on time) and June the worst month (71%).
The cancellation rate was 1.1% (US average 1.8%).
COS 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 | 83.0% | 75 min | 1.5% | 3,300 |
| Southwest Airlines | 76.8% | 55 min | 0.3% | 1,129 |
| United Airlines | 74.0% | 75 min | 0.5% | 579 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly COS to DEN
On-time arrival % by scheduled departure hour (local time), 10,243 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 88.0% | 0.7% | 571 |
| 6am–7am | 88.4% | 0.2% | 1,110 |
| 7am–8am | 87.1% | 1.5% | 1,050 |
| 8am–9am | 81.2% | 0.6% | 695 |
| 9am–10am | 79.0% | 0.6% | 864 |
| 10am–11am | 82.5% | 0.8% | 925 |
| 11am–12pm | 80.2% | 1.1% | 1,001 |
| 12pm–1pm | 84.4% | 1.0% | 407 |
| 1pm–2pm | 84.1% | 0.8% | 640 |
| 2pm–3pm | 76.8% | 0.5% | 205 |
| 3pm–4pm | 63.7% | 1.5% | 857 |
| 4pm–5pm | 71.3% | 0.0% | 216 |
| 5pm–6pm | 60.6% | 1.7% | 918 |
| 6pm–7pm | 65.2% | 5.1% | 730 |
| 7pm–8pm | 60.5% | 2.6% | 39 |
| 8pm–9pm | Limited data | 15 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on COS 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) | 86.0% | +6.7 pts | 0.5% | 187 |
| Christmas & New Year (Dec 20 - Jan 3) | 84.1% | +4.7 pts | 0.2% | 447 |
| Summer peak (Jun 15 - Aug 15) | 71.7% | -7.7 pts | 1.5% | 1,811 |
| All other days | 79.4% | — | 1.2% | 7,798 |
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).