Flight number record
DL 1428
Delta Air Lines · New York to Miami
- Route
- JFK → MIA
- Departs
- 19:55
- Flights
- 352
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1428, check with Delta Air Lines.
DL 1428 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 352 flights, with a median arrival 6 minutes early.
The national on-time rate over the same period is 77.3%, so DL 1428 runs 9 points behind the country as a whole. Across a thousand flights that is about 86 extra late arrivals.
Key figures
On time
68.7%
Arrivals under 15 minutes late, of 339 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
3.69%
National rate is 1.89%
1 hour+ late
13.6%
National rate is 8.3%
These figures cover 352 flights between September 2025 and August 2026. Beyond the headline rate, 13.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1428 flies
DL 1428 flies JFK to MIA without a single fixed slot. Its most common scheduled departure was 19:55, used on 186 of 352 flights, with 19:59 (82 flights) next.
- Departs 19:55186 flights52.8%
- Departs 19:5982 flights23.3%
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 19:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1428 runs level with that at 68.7%. 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 1428 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 1428 is 8 points behind 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 trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1428thin sample | 352 | 68.7% | 83 min | 3.69% | C− |
| 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 1428 quarter by quarter
DL 1428 did not run the same all year. Its best quarter was Apr–Jun 2026 at 78.0% on time and its weakest Jul–Sep 2026 at 61.0%, a swing of 17 points on roughly 70 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 flights66.7%
- Oct–Dec 202590 flights63.5%
- Jan–Mar 202679 flights70.3%
- Apr–Jun 202691 flights78.0%
- Jul–Sep 202662 flights61.0%
Scale runs 55% to 85%.
By weekday, DL 1428 did best on Tuesday at 80.4% on time and worst on Sunday at 56.2%. Each day rests on about 50 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1428 runs when it is late
DL 1428 often beats the schedule: 133 of 339 completed flights, 39%, arrived 15 minutes or more early. The 106 late arrivals split 28 under half an hour, 32 between 30 and 60 minutes, and 46 an hour or more.
- 15+ min early133 flights39.2%
- Within 15 min100 flights29.5%
- 15–29 min late28 flights8.3%
- 30–59 min late32 flights9.4%
- 1–2 hours late30 flights8.8%
- 2+ hours late16 flights4.7%
Scale runs 0% to 100%.
Share of 339 completed flights by arrival against schedule.
24 of 101 late departures made up the time and arrived on time, 24% of them. In the other direction, 29 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 1428
The latest arrival of the period was on 30 November 2025, 15 hours 55 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across November, December, March, August and May, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 November 2025 | 15 hours 55 minutes | Carrier |
| 29 December 2025 | 12 hours 29 minutes | Carrier |
| 15 March 2026 | 4 hours 27 minutes | Late-arriving aircraft |
| 17 August 2026 | 4 hours 18 minutes | National Airspace System |
| 20 May 2026 | 3 hours 59 minutes | National Airspace System |
Delay causes
Why DL 1428 runs late
Carrier accounts for 43% of the 8,825 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 29%National Airspace System
- 28%Late-arriving aircraft
- 0%Extreme weather
The largest share of delay minutes, 43%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,835 of the 8,825 delay minutes reported here. The split is drawn from 8,825 delay minutes reported on DL 1428.
Cancellations run at 3.69%, against 1.89% nationally. That is roughly one flight in 25 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
13.6% 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 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.
Every one of the 352 flights under DL 1428 in the data flew JFK 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. 352 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 1428
For a booking, the cancellation rate is the figure to plan around on DL 1428: 3.69% of its 352 scheduled flights did not operate. A late arrival costs an hour and a half, 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 1528 on the same route84.8%
- 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
- 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.