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6,261 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 92% depart on time. After 4 pm it’s 3 in 5.

Best time to leave 6–7 am 94% arrive on time from MIA
Best single flight DL 1261 MIA 08:17 → ATL 10:20 · 93% on time Avoid AA 1045 MIA 20:04 → ATL 22:09 · 57% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
MIA
93
95
91
90
83
83
81
79
72
73
65
62
65
56
59
57
61
64
% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55
Atlanta flights leaving MIA 5–6 pm: 1Close ×
F9 4405 MIA 17:28 ATL 20:00 2h 30m 336 57% 1.8% 93 min

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.
Delta 3,308 78% 1.8% 83 min
Spirit 252 75% 4.4% 66 min
Frontier 896 70% 1.8% 84 min
American (incl. Envoy, Republic) 1,805 70% 0.8% 82 min

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.
DL 1261 MIA 08:17 ATL 10:20 93%
DL 1249 MIA 06:00 ATL 08:05 93%
DL 1211 MIA 07:10 ATL 09:15 93%
DL 2836 MIA 10:40 ATL 12:48 85%
DL 1510 MIA 12:02 ATL 14:09 82%
· · ·
DL 1386 MIA 18:05 ATL 20:22 59%
F9 4405 MIA 17:28 ATL 20:00 57%
AA 1045 MIA 20:04 ATL 22:09 57%
All 20 flights on this route →

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.
Delta MIA ATL 2h 10m 78% 1.8% 3,308 Flying now
Frontier MIA ATL 2h 30m 70% 1.8% 896 Flying now
American MIA ATL 2h 04m 70% 0.8% 1,805 Flying now
Spirit MIA ATL 1h 58m 75% 4.4% 252 Not flying now
Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON