Best Time to Fly MIA to ATL: On-Time Stats by Hour & Airline
Miami International → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 73.6% of Miami (MIA) to Atlanta (ATL) flights arrived on time (6,261 scheduled flights). That is 4.1 points below the national average of 77.6%.
Envoy Air was the most punctual of the 6 airlines on the route at 78.7%, while Republic Airways trailed at 65.9%.
October has been the best month (84% on time) and Sunday the weakest day of the week (64%).
1.6% of flights were cancelled, versus 1.8% nationally.
MIA 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 |
|---|---|---|---|---|
| Envoy Air | 78.7% | 47 min | 1.3% | 229 |
| Delta Air Lines | 77.1% | 81 min | 1.8% | 3,308 |
| Spirit Airlines | 74.7% | 65 min | 4.4% | 252 |
| Frontier Airlines | 69.8% | 82 min | 1.8% | 896 |
| American Airlines | 67.4% | 84 min | 0.7% | 1,532 |
| Republic Airways | 65.9% | 60 min | 0.0% | 44 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MIA to ATL
On-time arrival % by scheduled departure hour (local time), 12,676 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 90.8% | 1.8% | 341 |
| 6am–7am | 91.3% | 1.7% | 883 |
| 7am–8am | 89.3% | 1.9% | 903 |
| 8am–9am | 86.0% | 1.6% | 1,423 |
| 9am–10am | 81.3% | 1.6% | 125 |
| 10am–11am | 82.9% | 1.4% | 838 |
| 11am–12pm | 77.9% | 1.4% | 358 |
| 12pm–1pm | 75.7% | 1.0% | 977 |
| 1pm–2pm | 75.9% | 1.8% | 390 |
| 2pm–3pm | 68.8% | 0.8% | 851 |
| 3pm–4pm | 67.3% | 1.9% | 704 |
| 4pm–5pm | 62.7% | 1.3% | 1,042 |
| 5pm–6pm | 62.2% | 1.2% | 559 |
| 6pm–7pm | 57.4% | 1.6% | 833 |
| 7pm–8pm | 57.4% | 1.6% | 909 |
| 8pm–9pm | 56.3% | 2.0% | 349 |
| 9pm–10pm | 64.6% | 0.7% | 754 |
| 10pm–11pm | 69.4% | 2.1% | 437 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MIA 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) | 74.9% | -0.6 pts | 0.4% | 237 |
| Christmas & New Year (Dec 20 - Jan 3) | 66.7% | -8.8 pts | 2.3% | 600 |
| Summer peak (Jun 15 - Aug 15) | 65.1% | -10.4 pts | 3.0% | 2,118 |
| All other days | 75.5% | — | 1.1% | 9,721 |
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).