Best Time to Fly ATL to DEN: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Denver International
Data through July 2026 · Last updated October 18, 2026
5,595 flights were scheduled from Atlanta (ATL) to Denver (DEN) in the last 12 months, and 78.2% of those that flew arrived on time, 0.6 points above the US average of 77.6%.
United Airlines was the most punctual of the 4 airlines on the route at 85.6%, while Frontier Airlines trailed at 71.9%.
November has been the best month (85% on time) and Sunday the weakest day of the week (72%).
1.1% of flights were cancelled, versus 1.8% nationally.
ATL 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 |
|---|---|---|---|---|
| United Airlines | 85.6% | 81 min | 0.5% | 941 |
| Delta Air Lines | 79.4% | 51 min | 1.2% | 2,810 |
| Southwest Airlines | 73.3% | 55 min | 1.1% | 1,075 |
| Frontier Airlines | 71.9% | 82 min | 1.3% | 769 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to DEN
On-time arrival % by scheduled departure hour (local time), 11,307 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 69.7% | 0.0% | 33 |
| 6am–7am | 90.8% | 1.1% | 529 |
| 7am–8am | 84.2% | 1.1% | 903 |
| 8am–9am | 86.4% | 1.3% | 850 |
| 9am–10am | 82.1% | 0.7% | 699 |
| 10am–11am | 83.1% | 1.6% | 554 |
| 11am–12pm | 86.9% | 0.7% | 1,070 |
| 12pm–1pm | 84.6% | 0.3% | 764 |
| 1pm–2pm | 79.3% | 0.3% | 749 |
| 2pm–3pm | 77.5% | 0.7% | 566 |
| 3pm–4pm | 72.5% | 0.5% | 199 |
| 4pm–5pm | 71.3% | 0.3% | 1,230 |
| 5pm–6pm | 56.0% | 0.6% | 160 |
| 6pm–7pm | 64.4% | 1.1% | 853 |
| 7pm–8pm | 53.4% | 1.0% | 514 |
| 8pm–9pm | 66.1% | 1.2% | 604 |
| 9pm–10pm | 68.5% | 1.1% | 534 |
| 10pm–11pm | 69.8% | 2.9% | 449 |
| 11pm–12am | 73.9% | 0.0% | 47 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ATL 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) | 74.3% | -3.8 pts | 0.0% | 218 |
| Christmas & New Year (Dec 20 - Jan 3) | 72.9% | -5.2 pts | 0.9% | 455 |
| Summer peak (Jun 15 - Aug 15) | 72.8% | -5.3 pts | 1.1% | 2,116 |
| All other days | 78.1% | — | 0.9% | 8,518 |
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).