Atlanta (ATL) to Miami (MIA): On-Time Performance
Data through July 2026
Atlanta (ATL) to Miami (MIA) effectively runs on two schedules. In October 2024, 88% of arrivals were on time; in July 2025 that fell to 58% — a 30-point seasonal swing. Across the full period the route averages 72% on-time against a national 78%. Morning departures also hold up better than evening ones (81% vs 61%), which matters most in the rough months.
- On-time
- 72%
- arrived <15 min late
- Avg delay
- 22 min
- completed flights
- Cancelled
- 1.5%
- Flights/day
- 17
- last 12 months
- Duration
- 1h 59m
- scheduled
- Distance
- 594 mi
Best airline from ATL to MIA
6 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Airmost reliable | 78% | 16 min | 1.7% | 411 |
| American Airlines | 76% | 23 min | 1.3% | 3,544 |
| Southwest Airlines | 76% | 14 min | 1.3% | 452 |
| Spirit Airlines | 75% | 23 min | 3.2% | 348 |
| Delta Air Lines | 71% | 19 min | 1.6% | 6,827 |
| Frontier Airlines | 63% | 35 min | 1.7% | 1,566 |
Monthly on-time trend
Best time to fly from ATL to MIA
Aim for departures around 5 a.m. (92% on-time); avoid 9 p.m. departures (46%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 70% | 24 min |
| Tuesday | 79% | 17 min |
| Wednesdaybest | 79% | 15 min |
| Thursday | 71% | 19 min |
| Friday | 71% | 25 min |
| Saturday | 68% | 24 min |
| Sunday | 65% | 30 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft39%
- Airline operations36%
- National airspace system20%
- Weather5%
Frequently asked questions
- How often are flights from ATL to MIA delayed?
- 28% of ATL–MIA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 22 minutes.
- Which airline is most reliable from ATL to MIA?
- Envoy Air has the best on-time record on this route at 78%, based on 411 flights. 6 airlines flew ATL–MIA frequently enough to compare in this period.
- What is the best time of day to fly from ATL to MIA?
- Departures around 5 a.m. have the best record (92% on-time), while departures around 9 p.m. have the worst (46%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ATL to MIA?
- The scheduled ATL–MIA flight time averages 1h 59m over 594 miles. Actual arrival times vary — flights on this route land 15+ minutes late 28% of the time.
- How often are ATL to MIA flights cancelled?
- 1.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ATL to MIA?
- July 2025 was the roughest month in this dataset, with only 58% of arrivals on time. The best was October 2024 at 88%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 13,198 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.