Best Time to Fly COS to ATL: On-Time Stats by Hour & Airline
City of Colorado Springs Municipal → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 89.2% of Colorado Springs (COS) to Atlanta (ATL) flights arrived on time (589 scheduled flights). That is 11.6 points above the national average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
September has been the best month (95% on time) and Saturday the weakest day of the week (81%).
1.9% of flights were cancelled, versus 1.8% nationally.
COS to ATL 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 |
|---|---|---|---|---|
| Delta Air Lines | 89.2% | 92 min | 1.9% | 589 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly COS to ATL
On-time arrival % by scheduled departure hour (local time), 1,112 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 88.6% | 1.0% | 585 |
| 7am–8am | Limited data | 1 | |
| 1pm–2pm | 85.5% | 1.3% | 453 |
| 2pm–3pm | 77.9% | 1.4% | 73 |
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 ATL
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 | 24 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 30 | ||
| Summer peak (Jun 15 - Aug 15) | 86.7% | -0.1 pts | 0.9% | 233 |
| All other days | 86.8% | — | 1.2% | 825 |
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).