Flight number record
DL 1508
Delta Air Lines · Atlanta to San Antonio
- Route
- ATL → SAT
- Departs
- 23:00
- Flights
- 352
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1508, check with Delta Air Lines.
DL 1508 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 352 flights, with a median arrival 6 minutes early.
Key figures
On time
78.5%
Arrivals under 15 minutes late, of 349 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.85%
National rate is 1.89%
1 hour+ late
6.6%
National rate is 8.3%
These figures cover 352 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 1508 flies
DL 1508 flies ATL to SAT without a single fixed slot. Its most common scheduled departure was 23:00, used on 110 of 352 flights, with 23:10 (55 flights) and 20:50 (38 flights) next.
- Departs 23:00110 flights31.3%
- Departs 23:1055 flights15.6%
- Departs 20:5038 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 23:00 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1508 runs 8 points better at 78.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 1508 next to ATL to SAT
Every carrier on ATL to SAT combined arrived on time 81.1% of the time across 2,962 flights, so DL 1508 is 3 points behind it. Delta flew 2,596 flights on the same city pair under all its flight numbers, including this one, and those ran 81.1% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1508thin sample | 352 | 78.5% | 60 min | 0.85% | B+ |
| All Delta Air Lines on ATL–SAT | 2,596 | 81.1% | 55 min | 1.85% | B |
| All carriers on ATL–SAT | 2,962 | 81.1% | 56 min | 1.65% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1508 quarter by quarter
DL 1508 did not run the same all year. Its best quarter was Jan–Mar 2026 at 84.3% on time and its weakest Jul–Sep 2026 at 63.2%, a swing of 21 points on roughly 88 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 202529 flights—
- Oct–Dec 202590 flights74.4%
- Jan–Mar 202684 flights84.3%
- Apr–Jun 202691 flights82.2%
- Jul–Sep 202658 flights63.2%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1508 did best on Wednesday at 92.3% on time and worst on Friday at 70.6%. Each day rests on about 50 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1508 runs when it is late
DL 1508 often beats the schedule: 103 of 349 completed flights, 30%, arrived 15 minutes or more early. The 75 late arrivals split 20 under half an hour, 32 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early103 flights29.5%
- Within 15 min171 flights49.0%
- 15–29 min late20 flights5.7%
- 30–59 min late32 flights9.2%
- 1–2 hours late14 flights4.0%
- 2+ hours late9 flights2.6%
Scale runs 0% to 100%.
Share of 349 completed flights by arrival against schedule.
A late pushback is often recovered here: of 94 departures that left 15 minutes late or more, 29 still arrived on time. 10 flights left on time and still arrived late.
The worst days
Worst days for DL 1508
The latest arrival of the period was on 6 July 2026, 7 hours 46 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 July 2026 | 7 hours 46 minutes | Carrier |
| 14 June 2026 | 3 hours 8 minutes | Late-arriving aircraft |
| 31 December 2025 | 2 hours 22 minutes | Carrier |
| 11 July 2026 | 2 hours 22 minutes | Carrier |
| 18 July 2026 | 2 hours 14 minutes | Carrier |
Delay causes
Why DL 1508 runs late
Carrier accounts for 60% of the 4,531 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Carrier
- 27%Late-arriving aircraft
- 12%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 60%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,700 of the 4,531 delay minutes reported here. The split is drawn from 4,531 delay minutes reported on DL 1508.
Cancellations are rare at 0.85%, 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
6.6% 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.
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.
Every one of the 352 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. 352 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 78.5% on time with 0.85% cancelled over 352 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to SAT, every carrier and departure
- SAT to ATL, the return direction
- Delta Air Lines 2893 on the same route74.2%
- Delta Air Lines 1408 on the same route85.8%
- Delta Air Lines 1465 on the same route77.5%
- Delta Air Lines 1676 on the same route91.3%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- San Antonio International (SAT) 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.