Flight number record
DL 1528
Delta Air Lines · New York to Miami
- Route
- JFK → MIA
- Departs
- 07:05
- Flights
- 358
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1528, check with Delta Air Lines.
DL 1528 earns a B−. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 358 flights, with a median arrival 14 minutes early.
Set against the rest of the country, DL 1528's record is 8 points better than the US average of 77.3%. That gap is worth roughly 75 fewer late arrivals for every thousand flights.
Key figures
On time
84.8%
Arrivals under 15 minutes late, of 341 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
4.75%
National rate is 1.89%
1 hour+ late
3.8%
National rate is 8.3%
These figures cover 358 flights between September 2025 and August 2026. The median arrival is 14 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.
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Schedule
When DL 1528 flies
DL 1528 flies JFK to MIA without a single fixed slot. Its most common scheduled departure was 07:05, used on 184 of 358 flights.
- Departs 07:05184 flights51.4%
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 07:05 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1528 runs 5 points worse at 84.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 1528 next to JFK to MIA
Every carrier on JFK to MIA combined arrived on time 76.8% of the time across 4,526 flights, so DL 1528 is 8 points ahead of it. Delta flew 1,621 flights on the same city pair under all its flight numbers, including this one, and those ran 75.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1528thin sample | 358 | 84.8% | 58 min | 4.75% | B− |
| All Delta Air Lines on JFK–MIA | 1,621 | 75.8% | 71 min | 3.45% | B− |
| All carriers on JFK–MIA | 4,526 | 76.8% | 97 min | 3.12% | B− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1528 quarter by quarter
DL 1528 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Oct–Dec 2025 at 73.6%, a swing of 23 points on roughly 72 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 flights96.7%
- Oct–Dec 202590 flights73.6%
- Jan–Mar 202687 flights80.2%
- Apr–Jun 202689 flights91.9%
- Jul–Sep 202662 flights91.2%
Scale runs 65% to 100%.
By weekday, DL 1528 did best on Wednesday at 94.1% on time and worst on Saturday at 76.7%. Each day rests on about 51 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1528 runs when it is late
DL 1528 often beats the schedule: 165 of 341 completed flights, 48%, arrived 15 minutes or more early. The 52 late arrivals split 19 under half an hour, 20 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early165 flights48.4%
- Within 15 min124 flights36.4%
- 15–29 min late19 flights5.6%
- 30–59 min late20 flights5.9%
- 1–2 hours late6 flights1.8%
- 2+ hours late7 flights2.1%
Scale runs 0% to 100%.
Share of 341 completed flights by arrival against schedule.
9 of 33 late departures made up the time and arrived on time, 27% of them. In the other direction, 28 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MIA.
The worst days
Worst days for DL 1528
The latest arrival of the period was on 20 April 2026, 4 hours 25 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 April 2026 | 4 hours 25 minutes | Carrier |
| 10 May 2026 | 3 hours 13 minutes | Carrier |
| 5 January 2026 | 2 hours 52 minutes | Carrier |
| 23 August 2026 | 2 hours 51 minutes | National Airspace System |
| 8 November 2025 | 2 hours 37 minutes | National Airspace System |
Delay causes
Why DL 1528 runs late
Carrier accounts for 51% of the 2,998 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Carrier
- 49%National Airspace System
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,531 of the 2,998 delay minutes reported here. The split is drawn from 2,998 delay minutes reported on DL 1528.
Cancellations run at 4.75%, against 1.89% nationally. That is about one flight in twenty cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.8% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,089 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.
The same number turns up on one other city pair in the data, including MIA to JFK (16), but none flew often enough under DL 1528 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to JFK to MIA only.
One caution: this is a thin sample. 358 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 1528
For a booking, the cancellation rate is the figure to plan around on DL 1528: 4.75% of its 358 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- JFK to MIA, every carrier and departure
- MIA to JFK, the return direction
- American Airlines 2017 on the same route84.8%
- Delta Air Lines 1514 on the same route77.0%
- Delta Air Lines 1428 on the same route68.7%
- American Airlines 688 on the same route75.2%
- Delta Air Lines 2500 on the same route70.8%
- John F. Kennedy International (JFK) 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
- What a cancellation rate actually tells you (and what it hides)
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.