Miami (MIA) to Atlanta (ATL): On-Time Performance
Data through July 2026
The calendar drives reliability on MIA–ATL. October 2024 flights landed on schedule 89% of the time, but July 2024 dropped to 58% — a gap of 30 points. Across the full period the route averages 73% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 60%), which matters most in the rough months.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 23 min
- completed flights
- Cancelled
- 1.5%
- Flights/day
- 17
- last 12 months
- Duration
- 2h 6m
- scheduled
- Distance
- 594 mi
Best airline from MIA to ATL
6 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 82% | 11 min | 1.1% | 451 |
| Envoy Air | 78% | 12 min | 1.2% | 409 |
| Delta Air Lines | 75% | 23 min | 1.6% | 6,831 |
| Spirit Airlines | 75% | 18 min | 3.2% | 348 |
| Frontier Airlines | 69% | 24 min | 2.0% | 1,562 |
| American Airlines | 68% | 27 min | 1.2% | 3,542 |
Monthly on-time trend
Best time to fly from MIA to ATL
Aim for departures around 5 a.m. (91% on-time); avoid 6 p.m. departures (55%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 72% | 28 min |
| Tuesday | 79% | 16 min |
| Wednesdaybest | 79% | 16 min |
| Thursday | 75% | 20 min |
| Friday | 73% | 24 min |
| Saturday | 69% | 26 min |
| Sunday | 64% | 31 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations36%
- National airspace system20%
- Weather4%
Frequently asked questions
- How often are flights from MIA to ATL delayed?
- 27% of MIA–ATL 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 23 minutes.
- Which airline is most reliable from MIA to ATL?
- Southwest Airlines has the best on-time record on this route at 82%, based on 451 flights. 6 airlines flew MIA–ATL frequently enough to compare in this period.
- What is the best time of day to fly from MIA to ATL?
- Departures around 5 a.m. have the best record (91% on-time), while departures around 6 p.m. have the worst (55%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MIA to ATL?
- The scheduled MIA–ATL flight time averages 2h 6m over 594 miles. Actual arrival times vary — flights on this route land 15+ minutes late 27% of the time.
- How often are MIA to ATL 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 MIA to ATL?
- July 2024 was the roughest month in this dataset, with only 58% of arrivals on time. The best was October 2024 at 89%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 13,193 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.