Flight number record
DL 1512
Delta Air Lines · Atlanta to Fort Lauderdale
- Route
- ATL → FLL
- Departs
- 10:35
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1512, check with Delta Air Lines.
DL 1512 lands a B, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 3 minutes early.
Set against the rest of the country, DL 1512's record is 4 points better than the US average of 77.6%. That gap is worth roughly 41 fewer late arrivals for every thousand flights.
Key figures
On time
81.7%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
2.19%
National rate is 1.81%
1 hour+ late
5.1%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. The median arrival is 3 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Schedule
When DL 1512 flies
DL 1512 flies ATL to FLL without a single fixed slot. Its most common scheduled departure was 10:35, used on 106 of 365 flights, with 10:38 (56 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 10:35106 flights29.0%
- Departs 10:3856 flights15.3%
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 10:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1512 runs 2 points worse at 81.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
DL 1512 next to ATL to FLL
Every carrier on ATL to FLL combined arrived on time 70.7% of the time across 7,189 flights, so DL 1512 is 11 points ahead of it. Delta flew 4,272 flights on the same city pair under all its flight numbers, including this one, and those ran 73.5% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1512 | 365 | 81.7% | 50 min | 2.19% | B |
| All Delta Air Lines on ATL–FLL | 4,272 | 73.5% | 55 min | 1.57% | C |
| All carriers on ATL–FLL | 7,189 | 70.7% | 64 min | 2.14% | C |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 1512 quarter by quarter
DL 1512 did not run the same all year. Its best quarter was Oct–Dec 2025 at 85.6% on time and its weakest Jan–Mar 2026 at 73.9%, a swing of 12 points on roughly 91 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 202592 flights82.2%
- Oct–Dec 202592 flights85.6%
- Jan–Mar 202690 flights73.9%
- Apr–Jun 202691 flights85.2%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1512 did best on Wednesday at 90.2% on time and worst on Saturday at 75.0%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 1512 runs late
One category carries most of the weight here. Carrier accounts for 51% of the 3,277 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.
- 51%Carrier
- 33%National Airspace System
- 16%Late-arriving aircraft
33% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,065 minutes out of 3,277, against a national NAS share of 21%. The split is drawn from 3,277 delay minutes reported on DL 1512.
Cancellations sit at 2.19% against a national 1.81%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
5.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 50 minutes, which a normal layover absorbs.
The 581 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.
DL 1512 is not only a ATL to FLL flight. It also flew FLL to ATL (305 flights, 76.7% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 365 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| FLL to ATLthin sample | 305 | 76.7% | 66 min | 1.64% | B |
What to do with this
Booking DL 1512
For a booking, read DL 1512 as 81.7% on time with 2.19% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to FLL, every carrier and departure
- FLL to ATL, the return direction
- Delta Air Lines 1341 on the same route70.9%
- Delta Air Lines 1489 on the same route68.5%
- Delta Air Lines 1295 on the same route67.3%
- Delta Air Lines 2345 on the same route65.4%
- Delta Air Lines 1334 on the same route89.2%
- Delta Air Lines 1413 on the same route69.7%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Fort Lauderdale-Hollywood International (FLL) 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
- Worst months to fly in the US, ranked by the data
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.