Flight number record
DL 1588
Delta Air Lines · Atlanta to Miami
- Route
- ATL → MIA
- Departs
- 18:55
- Flights
- 364
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1588, check with Delta Air Lines.
DL 1588 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 364 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.6%, so DL 1588 runs 12 points behind the country as a whole. Across a thousand flights that is about 121 extra late arrivals.
Key figures
On time
65.5%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.81%
1 hour+ late
12.3%
National rate is 8.1%
These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 12.3% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When DL 1588 flies
DL 1588 flies ATL to MIA without a single fixed slot. Its most common scheduled departure was 18:55, used on 69 of 364 flights, with 19:30 (55 flights) and 18:45 (50 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 18:5569 flights19.0%
- Departs 19:3055 flights15.1%
- Departs 18:4550 flights13.7%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 18:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 1588 runs 3 points worse at 65.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
DL 1588 next to ATL to MIA
Every carrier on ATL to MIA combined arrived on time 71.0% of the time across 6,229 flights, so DL 1588 is 6 points behind it. Delta flew 3,298 flights on the same city pair under all its flight numbers, including this one, and those ran 70.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1588thin sample | 364 | 65.5% | 62 min | 1.37% | C |
| All Delta Air Lines on ATL–MIA | 3,298 | 70.3% | 56 min | 1.43% | C |
| All carriers on ATL–MIA | 6,229 | 71.0% | 71 min | 1.41% | C |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 1588 quarter by quarter
Quarter by quarter DL 1588 held fairly steady: 61.5% in Jul–Sep 2025, 61.8% in Oct–Dec 2025, 70.5% in Jan–Mar 2026 and 68.1% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202592 flights61.5%
- Oct–Dec 202591 flights61.8%
- Jan–Mar 202690 flights70.5%
- Apr–Jun 202691 flights68.1%
Scale runs 55% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1588 ranged from 60.0% on Thursday to 69.8% on Tuesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why DL 1588 runs late
One category carries most of the weight here. Carrier accounts for 52% of the 7,648 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 52%Carrier
- 22%Late-arriving aircraft
- 21%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,984 of the 7,648 delay minutes reported here. The split is drawn from 7,648 delay minutes reported on DL 1588.
Cancellations sit at 1.37% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.3% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 594 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 364 flights under DL 1588 in the data flew ATL to MIA. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 364 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking DL 1588
For a booking, DL 1588 is a flight to put a long connection behind. 12.3% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- ATL to MIA, every carrier and departure
- MIA to ATL, the return direction
- Delta Air Lines 1510 on the same route82.5%
- Delta Air Lines 1332 on the same route79.2%
- Delta Air Lines 1579 on the same route73.6%
- Delta Air Lines 1323 on the same route60.3%
- Delta Air Lines 2836 on the same route88.6%
- Frontier Airlines 4406 on the same route72.8%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Miami International (MIA) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- How often a connection fails at the major US hubs
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.