Flight number record
DL 1525
Delta Air Lines · Atlanta to Tampa
- Route
- ATL → TPA
- Departs
- 12:25
- Flights
- 351
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1525, check with Delta Air Lines.
DL 1525 lands a B+, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 351 flights, with a median arrival 3 minutes early.
Key figures
On time
78.7%
Arrivals under 15 minutes late, of 348 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
7.8%
National rate is 8.3%
These figures cover 351 flights between September 2025 and August 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.
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Schedule
When DL 1525 flies
DL 1525 flies ATL to TPA without a single fixed slot. Its most common scheduled departure was 12:25, used on 38 of 351 flights, with 12:22 (38 flights) next.
- Departs 12:2538 flights10.8%
- Departs 12:2238 flights10.8%
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 12:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1525 runs level with that at 78.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 1525 next to ATL to TPA
Every carrier on ATL to TPA combined arrived on time 73.0% of the time across 6,204 flights, so DL 1525 is 6 points ahead of it. Delta flew 4,452 flights on the same city pair under all its flight numbers, including this one, and those ran 74.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1525thin sample | 351 | 78.7% | 66 min | 0.28% | B+ |
| All Delta Air Lines on ATL–TPA | 4,452 | 74.3% | 59 min | 1.33% | C |
| All carriers on ATL–TPA | 6,204 | 73.0% | 64 min | 1.34% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1525 quarter by quarter
Quarter by quarter DL 1525 held fairly steady: 77.8% in Oct–Dec 2025, 78.7% in Jan–Mar 2026, 79.8% in Apr–Jun 2026 and 73.2% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights—
- Oct–Dec 202590 flights77.8%
- Jan–Mar 202689 flights78.7%
- Apr–Jun 202685 flights79.8%
- Jul–Sep 202657 flights73.2%
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1525 did best on Thursday at 90.4% on time and worst on Sunday at 66.0%. 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 1525 runs when it is late
The 74 late arrivals split 30 under half an hour, 17 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early19 flights5.5%
- Within 15 min255 flights73.3%
- 15–29 min late30 flights8.6%
- 30–59 min late17 flights4.9%
- 1–2 hours late18 flights5.2%
- 2+ hours late9 flights2.6%
Scale runs 0% to 100%.
Share of 348 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 65 departures that left 15 minutes late or more, only 7 made it up before arrival. 16 flights left on time and still arrived late.
The worst days
Worst days for DL 1525
The latest arrival of the period was on 26 May 2026, 7 hours 26 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 May 2026 | 7 hours 26 minutes | Carrier |
| 16 March 2026 | 5 hours 47 minutes | National Airspace System |
| 11 October 2025 | 4 hours 7 minutes | Carrier |
| 25 January 2026 | 4 hours 1 minute | Carrier |
| 25 October 2025 | 2 hours 35 minutes | Carrier |
Delay causes
Why DL 1525 runs late
Carrier accounts for 63% of the 4,856 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 25%National Airspace System
- 11%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,067 of the 4,856 delay minutes reported here. The split is drawn from 4,856 delay minutes reported on DL 1525.
Cancellations are rare at 0.28%, below the national 1.89% 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
7.8% of arrivals land an hour or more late, close to the national 8.3%, so 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.
DL 1525 is not only a ATL to TPA flight. It also flew TPA to ATL (289 flights, 72.2% 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. 351 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 |
|---|---|---|---|---|---|
| TPA to ATLthin sample | 289 | 72.2% | 87 min | 0.00% | C+ |
What to do with this
Booking DL 1525
For a booking, read DL 1525 as 78.7% on time with 0.28% cancelled over 351 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to TPA, every carrier and departure
- TPA to ATL, the return direction
- Delta Air Lines 1227 on the same route90.8%
- Delta Air Lines 1587 on the same route79.8%
- Delta Air Lines 1099 on the same route83.7%
- Delta Air Lines 759 on the same route68.5%
- Delta Air Lines 1457 on the same route65.9%
- Delta Air Lines 1594 on the same route61.8%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Tampa International (TPA) 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.