Flight number record

DL 1508

Delta Air Lines · Atlanta to San Antonio

Route: ATL → SAT
Departs: 23:00
Flights: 356
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1508, check with Delta Air Lines.

DL 1508 lands a B+, 2 points 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 roughly 50 minutes on average. That is a workable record, not a spotless one. That rests on 356 flights, with a median arrival 6 minutes early.

On time

79.3%

Arrivals under 15 minutes late, of 353 completed flights

Avg delay

52 min

Across delayed arrivals only, not all flights

Cancelled

0.84%

National rate is 1.81%

1 hour+ late

5.7%

National rate is 8.1%

These figures cover 356 flights between July 2025 and June 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.

Schedule

When DL 1508 flies

DL 1508 flies ATL to SAT without a single fixed slot. Its most common scheduled departure was 23:00, used on 80 of 356 flights, with 23:10 (55 flights) and 22:35 (46 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 23:0080 flights22.5%
Departs 23:1055 flights15.4%
Departs 22:3546 flights12.9%

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 23:00 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 1508 runs 9 points better at 79.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 1508 next to ATL to SAT

Every carrier on ATL to SAT combined arrived on time 81.2% of the time across 3,027 flights, so DL 1508 is 2 points behind it. Delta flew 2,610 flights on the same city pair under all its flight numbers, including this one, and those ran 81.5% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 2 points.

DL 1508 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1508thin sample	356	79.3%	52 min	0.84%	B+
All Delta Air Lines on ATL–SAT	2,610	81.5%	53 min	1.69%	B
All carriers on ATL–SAT	3,027	81.2%	55 min	1.49%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1508 quarter by quarter

Quarter by quarter DL 1508 held fairly steady: 76.7% in Jul–Sep 2025, 74.4% in Oct–Dec 2025, 84.3% in Jan–Mar 2026 and 82.2% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202591 flights76.7%
Oct–Dec 202590 flights74.4%
Jan–Mar 202684 flights84.3%
Apr–Jun 202691 flights82.2%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1508 ranged from 74.0% on Thursday to 84.8% on Saturday. With about 51 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1508 runs late

One category carries most of the weight here. Carrier accounts for 52% of the 3,777 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
52%
Late-arriving aircraft
32%
National Airspace System
15%
Extreme weather
1%

The largest share of delay minutes, 52%, 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 1,965 of the 3,777 delay minutes reported here. The split is drawn from 3,777 delay minutes reported on DL 1508.

Cancellations are rare at 0.84%, 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

5.7% 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 roughly 50 minutes, which a normal layover absorbs.

The 874 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.

Every one of the 356 flights under DL 1508 in the data flew ATL to SAT. 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. 356 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 1508

For a booking, read DL 1508 as 79.3% on time with 0.84% cancelled over 356 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