Flight number record
DL 1510
Delta Air Lines · Atlanta to Miami
- Route
- ATL → MIA
- Departs
- 08:55
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1510, check with Delta Air Lines.
DL 1510 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 45 minutes on average. That rests on 365 flights, with a median arrival 6 minutes early.
Set against the rest of the country, DL 1510's record is 6 points better than the US average of 77.3%. That gap is worth roughly 64 fewer late arrivals for every thousand flights.
Key figures
On time
83.7%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
46 min
Across delayed arrivals only, not all flights
Cancelled
2.47%
National rate is 1.89%
1 hour+ late
3.1%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 6 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 1510 flies
DL 1510 flies ATL to MIA without a single fixed slot. Its most common scheduled departure was 08:55, used on 103 of 365 flights, with 08:35 (49 flights) and 09:00 (41 flights) next.
- Departs 08:55103 flights28.2%
- Departs 08:3549 flights13.4%
- Departs 09:0041 flights11.2%
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 08:55 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1510 runs level with that at 83.7%. 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 1510 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 1510 is 13 points ahead of 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 beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1510 | 365 | 83.7% | 46 min | 2.47% | B |
| 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 1510 quarter by quarter
DL 1510 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jan–Mar 2026 at 76.4%, a swing of 20 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 flights96.7%
- Oct–Dec 202592 flights77.5%
- Jan–Mar 202690 flights76.4%
- Apr–Jun 202691 flights86.5%
- Jul–Sep 202662 flights93.1%
Scale runs 70% to 100%.
By weekday, DL 1510 did best on Wednesday at 90.4% on time and worst on Monday at 73.6%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1510 runs when it is late
The 58 late arrivals split 26 under half an hour, 21 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early67 flights18.9%
- Within 15 min230 flights64.8%
- 15–29 min late26 flights7.3%
- 30–59 min late21 flights5.9%
- 1–2 hours late8 flights2.3%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
11 of 46 late departures made up the time and arrived on time, 24% of them. In the other direction, 23 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 1510
The latest arrival of the period was on 9 February 2026, 2 hours 47 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 |
|---|---|---|
| 9 February 2026 | 2 hours 47 minutes | Carrier |
| 9 November 2025 | 2 hours 46 minutes | Carrier |
| 29 August 2026 | 2 hours 36 minutes | National Airspace System |
| 11 December 2025 | 1 hour 39 minutes | Carrier |
| 16 March 2026 | 1 hour 39 minutes | National Airspace System |
Delay causes
Why DL 1510 runs late
Carrier accounts for 50% of the 2,653 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 45%National Airspace System
- 4%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,333 of the 2,653 delay minutes reported here. The split is drawn from 2,653 delay minutes reported on DL 1510.
Cancellations sit at 2.47% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.1% 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 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.
DL 1510 is not only a ATL to MIA flight. It also flew MIA to ATL (365 flights, 83.5% 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 |
|---|---|---|---|---|---|
| MIA to ATL | 365 | 83.5% | 69 min | 1.92% | B |
What to do with this
Booking DL 1510
For a booking, read DL 1510 as 83.7% on time with 2.47% 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 MIA, every carrier and departure
- MIA to ATL, the return direction
- Delta Air Lines 1332 on the same route82.2%
- Delta Air Lines 1588 on the same route64.2%
- 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
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.