Flight number record
DL 2534
Delta Air Lines · San Antonio to Los Angeles
- Route
- SAT → LAX
- Departs
- 06:00
- Flights
- 334
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2534, check with Delta Air Lines.
DL 2534 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 334 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 2534's record is 14 points better than the US average of 77.3%. That gap is worth roughly 143 fewer late arrivals for every thousand flights.
Key figures
On time
91.6%
Arrivals under 15 minutes late, of 333 completed flights
Avg delay
93 min
Across delayed arrivals only, not all flights
Cancelled
0.30%
National rate is 1.89%
1 hour+ late
3.6%
National rate is 8.3%
These figures cover 334 flights between September 2025 and August 2026. The median arrival is 13 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When DL 2534 flies
DL 2534 flies SAT to LAX without a single fixed slot. Its most common scheduled departure was 06:00, used on 110 of 334 flights, with 07:00 (62 flights) and 07:35 (36 flights) next.
- Departs 06:00110 flights32.9%
- Departs 07:0062 flights18.6%
- Departs 07:3536 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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2534 runs 2 points better at 91.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 2534 next to SAT to LAX
Every carrier on SAT to LAX combined arrived on time 85.9% of the time across 1,814 flights, so DL 2534 is 6 points ahead of it. Delta flew 679 flights on the same city pair under all its flight numbers, including this one, and those ran 88.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2534thin sample | 334 | 91.6% | 93 min | 0.30% | A+ |
| All Delta Air Lines on SAT–LAX | 679 | 88.8% | 107 min | 0.29% | A+ |
| All carriers on SAT–LAX | 1,814 | 85.9% | 88 min | 0.44% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2534 quarter by quarter
DL 2534 did not run the same all year. Its best quarter was Oct–Dec 2025 at 98.9% on time and its weakest Jan–Mar 2026 at 85.6%, a swing of 13 points on roughly 67 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 202530 flights90.0%
- Oct–Dec 202592 flights98.9%
- Jan–Mar 202690 flights85.6%
- Apr–Jun 202660 flights89.8%
- Jul–Sep 202662 flights91.9%
Scale runs 75% to 100%.
By weekday, DL 2534 ranged from 87.2% on Thursday to 95.7% on Saturday. With about 48 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 2534 runs when it is late
DL 2534 often beats the schedule: 157 of 333 completed flights, 47%, arrived 15 minutes or more early. The 28 late arrivals split 7 under half an hour, 9 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early157 flights47.1%
- Within 15 min148 flights44.4%
- 15–29 min late7 flights2.1%
- 30–59 min late9 flights2.7%
- 1–2 hours late4 flights1.2%
- 2+ hours late8 flights2.4%
Scale runs 0% to 100%.
Share of 333 completed flights by arrival against schedule.
5 of 28 late departures made up the time and arrived on time, 18% of them. Only 5 left on time and still arrived late.
The worst days
Worst days for DL 2534
The latest arrival of the period was on 4 September 2025, 6 hours 3 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 |
|---|---|---|
| 4 September 2025 | 6 hours 3 minutes | Carrier |
| 25 January 2026 | 5 hours 41 minutes | Late-arriving aircraft |
| 20 July 2026 | 3 hours 41 minutes | Carrier |
| 29 June 2026 | 2 hours 47 minutes | Carrier |
| 29 August 2026 | 2 hours 47 minutes | Carrier |
Delay causes
Why DL 2534 runs late
Carrier accounts for 77% of the 2,615 delay minutes carriers reported here, and the remaining four split what is left.
- 77%Carrier
- 9%National Airspace System
- 8%Late-arriving aircraft
- 7%Extreme weather
The largest share of delay minutes, 77%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,002 of the 2,615 delay minutes reported here. The split is drawn from 2,615 delay minutes reported on DL 2534.
Cancellations are rare at 0.30%, 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
Badly late arrivals are rare here: only 3.6% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,211 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.
The same number turns up on one other city pair in the data, including ATL to MEM (31), but none flew often enough under DL 2534 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SAT to LAX only.
One caution: this is a thin sample. 334 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 2534
For a booking, DL 2534 has one of the better records a US domestic flight can show: 91.6% on time and 0.30% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SAT to LAX, every carrier and departure
- LAX to SAT, the return direction
- SkyWest Airlines 4951 on the same route91.7%
- San Antonio International (SAT) delay statistics
- Los Angeles International (LAX) 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.