Flight number record

DL 1525

Delta Air Lines · Atlanta to Tampa

Route: ATL → TPA
Departs: 12:33
Flights: 350
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1525, check with Delta Air Lines.

DL 1525 lands a B+, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 350 flights, with a median arrival 3 minutes early.

On time

77.0%

Arrivals under 15 minutes late, of 348 completed flights

Avg delay

68 min

Across delayed arrivals only, not all flights

Cancelled

0.29%

National rate is 1.81%

1 hour+ late

8.3%

National rate is 8.1%

These figures cover 350 flights between July 2025 and June 2026. Beyond the headline rate, 8.3% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 1525 flies

DL 1525 flies ATL to TPA without a single fixed slot. Its most common scheduled departure was 12:33, used on 60 of 350 flights, with 12:30 (45 flights) and 12:25 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:3360 flights17.1%
Departs 12:3045 flights12.9%
Departs 12:2538 flights10.9%

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 12:33 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 1525 runs level with that at 77.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1525 next to ATL to TPA

Every carrier on ATL to TPA combined arrived on time 73.3% of the time across 6,141 flights, so DL 1525 is 4 points ahead of it. Delta flew 4,413 flights on the same city pair under all its flight numbers, including this one, and those ran 74.6% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 5 points.

DL 1525 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1525thin sample	350	77.0%	68 min	0.29%	B+
All Delta Air Lines on ATL–TPA	4,413	74.6%	55 min	1.18%	C
All carriers on ATL–TPA	6,141	73.3%	61 min	1.22%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1525 quarter by quarter

Quarter by quarter DL 1525 held fairly steady: 71.8% in Jul–Sep 2025, 77.8% in Oct–Dec 2025, 78.7% in Jan–Mar 2026 and 79.8% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202586 flights71.8%
Oct–Dec 202590 flights77.8%
Jan–Mar 202689 flights78.7%
Apr–Jun 202685 flights79.8%

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 64.0%. Each day rests on about 50 flights, so a gap of 26 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1525 runs late

One category carries most of the weight here. Carrier accounts for 61% of the 5,473 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
61%
National Airspace System
21%
Late-arriving aircraft
16%
Extreme weather
2%

The largest share of delay minutes, 61%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,321 of the 5,473 delay minutes reported here. The split is drawn from 5,473 delay minutes reported on DL 1525.

Cancellations are rare at 0.29%, 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

8.3% 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 a little over an hour, which a normal layover absorbs.

DL 1525 is not only a ATL to TPA flight. It also flew TPA to ATL (288 flights, 73.3% 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. 350 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.

Other routes flown as DL 1525
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
TPA to ATLthin sample	288	73.3%	85 min	0.00%	C+

What to do with this

Booking DL 1525

For a booking, read DL 1525 as 77.0% on time with 0.29% cancelled over 350 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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.

Key figures