Best Time to Fly DEN to ATL: On-Time Stats by Hour & Airline
Denver International → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
5,602 flights were scheduled from Denver (DEN) to Atlanta (ATL) in the last 12 months, and 79.4% of those that flew arrived on time, 1.8 points above the US average of 77.6%.
Delta Air Lines was the most punctual of the 4 airlines on the route at 86.0%, while Southwest Airlines trailed at 64.4%.
November has been the best month (86% on time) and Sunday the weakest day of the week (75%).
0.9% of flights were cancelled, versus 1.8% nationally.
DEN 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 | 86.0% | 62 min | 1.2% | 2,810 |
| United Airlines | 78.1% | 63 min | 0.4% | 941 |
| Frontier Airlines | 77.6% | 60 min | 0.8% | 775 |
| Southwest Airlines | 64.4% | 52 min | 0.7% | 1,076 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to ATL
On-time arrival % by scheduled departure hour (local time), 11,302 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 85.2% | 1.1% | 737 |
| 5am–6am | 93.0% | 0.9% | 419 |
| 6am–7am | 88.7% | 1.0% | 700 |
| 7am–8am | 89.1% | 1.0% | 807 |
| 8am–9am | 84.4% | 0.6% | 317 |
| 9am–10am | 78.9% | 0.3% | 704 |
| 10am–11am | 79.2% | 0.7% | 1,417 |
| 11am–12pm | 77.5% | 0.3% | 344 |
| 12pm–1pm | 80.6% | 0.5% | 634 |
| 1pm–2pm | 79.2% | 0.8% | 1,421 |
| 2pm–3pm | 74.7% | 0.7% | 690 |
| 3pm–4pm | 74.1% | 0.4% | 558 |
| 4pm–5pm | 73.9% | 1.3% | 838 |
| 5pm–6pm | 64.4% | 0.3% | 877 |
| 6pm–7pm | 61.8% | 0.5% | 185 |
| 7pm–8pm | 51.3% | 0.0% | 231 |
| 8pm–9pm | 51.8% | 0.0% | 56 |
| 11pm–12am | 69.1% | 1.9% | 367 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEN 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) | 88.0% | +7.8 pts | 0.0% | 216 |
| Christmas & New Year (Dec 20 - Jan 3) | 76.0% | -4.2 pts | 0.2% | 456 |
| Summer peak (Jun 15 - Aug 15) | 69.3% | -10.9 pts | 1.0% | 2,118 |
| All other days | 80.2% | — | 0.8% | 8,512 |
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).