ON TIMEBOARD
Delta Air Lines / ATL → MIA

DL 1579 on time

Delta Air Lines 1579: Atlanta to Miami at 12:15 p.m.; Miami to Atlanta at 4:00 p.m. (past 12 months). Figures below the title are for ATL → MIA, its busiest leg

On time
74%
361 flights · likely 69–78%
Cancelled
0.8%
of scheduled flights
Typical arrival
−1 min
median vs schedule
When late
+49 min
average delay
Similar flights
76%
DL, same route & hour

About 1 in 4 DL 1579 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (26%); 0.8% were cancelled. The typical flight landed 1 minutes early.

DL 1579: ATL → MIA

Scheduled to leave Atlanta at 12:15 p.m. local time. Over the past year it arrived on time 74% of the time (361 flights), in line with other DL flights on the route at that hour (76%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: 77% on time (30 flights)77SepOct 2025: 71% on time (31 flights)71OctNov 2025: 77% on time (30 flights)77NovDec 2025: 52% on time (31 flights)52DecJan 2026: 70% on time (27 flights)70JanFeb 2026: 71% on time (28 flights)71FebMar 2026: 61% on time (31 flights)61MarApr 2026: 90% on time (30 flights)90AprMay 2026: 84% on time (31 flights)84MayJun 2026: 93% on time (30 flights)93JunJul 2026: 71% on time (31 flights)71JulAug 2026: 74% on time (31 flights)74Aug

By day of week

DayFlightsOn time
Monday5374%
Tuesday5074%
Wednesday5078%
Thursday5279%
Friday5275%
Saturday5277%
Sunday5263%

Why it was late

Airline (crew, maintenance, ops) 51%Air traffic & airport (NAS) 36%Late inbound plane 11%Severe weather 2%

All flights ATL → MIA · Connecting off DL 1579? Check the risk

DL 1579: MIA → ATL

Scheduled to leave Miami at 4:00 p.m. local time. Over the past year it arrived on time 66% of the time (325 flights), better than other DL flights on the route at that hour (63%). Last seen in the data Aug 31, 2026.

Month by month

30%65%100%Sep 2025: 73% on time (30 flights)73SepOct 2025: 61% on time (31 flights)61OctNov 2025: 63% on time (30 flights)63NovDec 2025: 65% on time (31 flights)65DecJan 2026: 67% on time (27 flights)67JanFeb 2026: 68% on time (28 flights)68FebMar 2026: too few flights (7 flights)MarApr 2026: 89% on time (18 flights)89AprMay 2026: 74% on time (31 flights)74MayJun 2026: 83% on time (30 flights)83JunJul 2026: 42% on time (31 flights)42JulAug 2026: 61% on time (31 flights)61Aug

By day of week

DayFlightsOn time
Monday4869%
Tuesday4567%
Wednesday4582%
Thursday4768%
Friday4764%
Saturday4760%
Sunday4657%

Why it was late

Late inbound plane 36%Air traffic & airport (NAS) 27%Airline (crew, maintenance, ops) 26%Severe weather 9%Security 1%

All flights MIA → ATL · Connecting off DL 1579? Check the risk

Questions

How often is DL 1579 from ATL to MIA late?

Delta Air Lines 1579 from Atlanta, GA to Miami, FL arrived 15 or more minutes late, was diverted or was cancelled on 26% of 361 scheduled flights between September 2025 and August 2026. 0.8% were cancelled.

How often is DL 1579 from MIA to ATL late?

Delta Air Lines 1579 from Miami, FL to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 34% of 325 scheduled flights between September 2025 and August 2026. 0.6% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.