MIA (Miami) to ATL (Atlanta) flights arrive on time 72% of the time. The most reliable airline on this route is Southwest Airlines at 83%. The average delay is 80 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated April 2026.MIA → ATL
MIA (Miami) to ATL (Atlanta)
MIA → ATL on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 72% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Southwest Airlines is significantly more reliable on this route at 83% on time vs American Airlines at 67%.
Airline Comparison
Southwest Airlines leads at 83% on time; American Airlines trails at 67%.
Accurate?
Good to know
Departing from MIA
76% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. MIA has long runway queues.
TSA is currently ~23 min. Best time: 4 AM (about 5 min).
Arriving at ATL
83% on timeWhen flights into ATL are late, the average delay is 68 minutes. Build buffer if you have ground plans.
If connecting at ATL: TSA is ~23 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated April 2026. Source: Bureau of Transportation Statistics.