Flight number record
DL 1588
Delta Air Lines · Atlanta to Miami
- Route
- ATL → MIA
- Departs
- 18:55
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1588, check with Delta Air Lines.
DL 1588 draws a D. 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 77.3%, so DL 1588 runs 13 points behind the country as a whole. Across a thousand flights that is about 131 extra late arrivals.
Key figures
On time
64.2%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
13.9%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 13.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 18:45 (50 flights) and 19:30 (43 flights) next.
- Departs 18:5569 flights19.0%
- Departs 18:4550 flights13.7%
- Departs 19:3043 flights11.8%
Scale runs 0% to 100%.
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 68.0%, and DL 1588 runs 4 points worse at 64.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 1588 next to ATL to MIA
Every carrier on ATL to MIA combined arrived on time 71.2% of the time across 6,280 flights, so DL 1588 is 7 points behind it. Delta flew 3,321 flights on the same city pair under all its flight numbers, including this one, and those ran 71.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1588thin sample | 364 | 64.2% | 67 min | 1.10% | D |
| All Delta Air Lines on ATL–MIA | 3,321 | 71.4% | 56 min | 1.81% | C |
| All carriers on ATL–MIA | 6,280 | 71.2% | 73 min | 1.61% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1588 quarter by quarter
DL 1588 did not run the same all year. Its best quarter was Jul–Sep 2025 at 73.3% on time and its weakest Jul–Sep 2026 at 48.4%, a swing of 25 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights73.3%
- Oct–Dec 202591 flights61.8%
- Jan–Mar 202690 flights70.5%
- Apr–Jun 202691 flights68.1%
- Jul–Sep 202662 flights48.4%
Scale runs 40% to 80%.
By weekday, DL 1588 did best on Wednesday at 73.1% on time and worst on Thursday at 54.9%. Each day rests on about 52 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1588 runs when it is late
The 129 late arrivals split 33 under half an hour, 46 between 30 and 60 minutes, and 50 an hour or more.
- 15+ min early48 flights13.3%
- Within 15 min183 flights50.8%
- 15–29 min late33 flights9.2%
- 30–59 min late46 flights12.8%
- 1–2 hours late32 flights8.9%
- 2+ hours late18 flights5.0%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
22 of 134 late departures made up the time and arrived on time, 16% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for DL 1588
The latest arrival of the period was on 8 November 2025, 6 hours 31 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across November, July, October, September and December, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 November 2025 | 6 hours 31 minutes | National Airspace System |
| 16 July 2026 | 4 hours 48 minutes | Carrier |
| 10 October 2025 | 4 hours 24 minutes | Late-arriving aircraft |
| 11 September 2025 | 3 hours 37 minutes | Late-arriving aircraft |
| 26 December 2025 | 3 hours 24 minutes | Carrier |
Delay causes
Why DL 1588 runs late
Carrier accounts for 51% of the 8,613 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Carrier
- 25%Late-arriving aircraft
- 19%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,423 of the 8,613 delay minutes reported here. The split is drawn from 8,613 delay minutes reported on DL 1588.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
13.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
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. 13.9% 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 route83.7%
- Delta Air Lines 1332 on the same route82.2%
- Delta Air Lines 1323 on the same route62.4%
- Delta Air Lines 1579 on the same route75.3%
- Frontier Airlines 4406 on the same route72.5%
- Delta Air Lines 2836 on the same route89.8%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.