Flight number record
DL 1510
Delta Air Lines · Miami to Atlanta
- Route
- MIA → ATL
- Departs
- 12:00
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1510, check with Delta Air Lines.
DL 1510 lands a B+, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 7 minutes early.
Key figures
On time
78.9%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.81%
1 hour+ late
5.5%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. The median arrival is 7 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 1510 flies
DL 1510 flies MIA to ATL without a single fixed slot. Its most common scheduled departure was 12:00, used on 122 of 365 flights, with 12:01 (57 flights) and 12:36 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 12:00122 flights33.4%
- Departs 12:0157 flights15.6%
- Departs 12:3641 flights11.2%
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 12:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 1510 runs level with that at 78.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
DL 1510 next to MIA to ATL
Every carrier on MIA to ATL combined arrived on time 73.7% of the time across 6,223 flights, so DL 1510 is 5 points ahead of it. Delta flew 3,300 flights on the same city pair under all its flight numbers, including this one, and those ran 76.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1510 | 365 | 78.9% | 64 min | 0.82% | B+ |
| All Delta Air Lines on MIA–ATL | 3,300 | 76.7% | 83 min | 1.39% | B |
| All carriers on MIA–ATL | 6,223 | 73.7% | 80 min | 1.41% | C |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 1510 quarter by quarter
DL 1510 did not run the same all year. Its best quarter was Apr–Jun 2026 at 91.0% on time and its weakest Oct–Dec 2025 at 72.5%, a swing of 19 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 flights73.6%
- Oct–Dec 202592 flights72.5%
- Jan–Mar 202690 flights78.9%
- Apr–Jun 202691 flights91.0%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1510 ranged from 74.5% on Saturday to 82.7% on Monday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why DL 1510 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,865 reported delay minutes.
- 42%Carrier
- 35%Late-arriving aircraft
- 20%National Airspace System
- 3%Extreme weather
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,865 reported delay minutes here, that single category outweighs weather by 12 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,865 delay minutes reported on DL 1510.
Cancellations are rare at 0.82%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
5.5% 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 an hour, which a normal layover absorbs.
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. 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 1510 is not only a MIA to ATL flight. It also flew ATL to MIA (365 flights, 82.5% 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 |
|---|---|---|---|---|---|
| ATL to MIA | 365 | 82.5% | 46 min | 1.37% | B |
What to do with this
Booking DL 1510
For a booking, read DL 1510 as 78.9% on time with 0.82% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- MIA to ATL, every carrier and departure
- ATL to MIA, the return direction
- Delta Air Lines 1261 on the same route92.0%
- Delta Air Lines 1332 on the same route73.9%
- Delta Air Lines 2836 on the same route84.6%
- Delta Air Lines 1211 on the same route92.2%
- Delta Air Lines 1386 on the same route58.4%
- Frontier Airlines 4405 on the same route60.5%
- Miami International (MIA) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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
- Why the first flight of the morning is statistically safest
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.