Flight number record

DL 2534

Delta Air Lines · San Antonio to Los Angeles

Route: SAT → LAX
Departs: 06:00
Flights: 334
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 15 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 334 flights, with a median arrival 14 minutes early.

Set against the rest of the country, DL 2534's record is 15 points better than the US average of 77.6%. That gap is worth roughly 149 fewer late arrivals for every thousand flights.

On time

92.5%

Arrivals under 15 minutes late, of 333 completed flights

Avg delay

86 min

Across delayed arrivals only, not all flights

Cancelled

0.30%

National rate is 1.81%

1 hour+ late

2.7%

National rate is 8.1%

These figures cover 334 flights between July 2025 and June 2026. The median arrival is 14 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 2534 flies

DL 2534 flies SAT to LAX without a single fixed slot. Its most common scheduled departure was 06:00, used on 172 of 334 flights, with 07:00 (62 flights) and 07:35 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:00172 flights51.5%
Departs 07:0062 flights18.6%
Departs 07:3536 flights10.8%

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 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 3 points better at 92.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 2534 next to SAT to LAX

Every carrier on SAT to LAX combined arrived on time 86.6% of the time across 1,881 flights, so DL 2534 is 6 points ahead of it. Delta flew 684 flights on the same city pair under all its flight numbers, including this one, and those ran 89.4% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 11 points.

DL 2534 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2534thin sample	334	92.5%	86 min	0.30%	A+
All Delta Air Lines on SAT–LAX	684	89.4%	107 min	0.44%	A+
All carriers on SAT–LAX	1,881	86.6%	89 min	0.48%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 84 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 202592 flights94.6%
Oct–Dec 202592 flights98.9%
Jan–Mar 202690 flights85.6%
Apr–Jun 202660 flights89.8%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2534 ranged from 89.4% on Thursday to 97.9% 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.

Delay causes

Why DL 2534 runs late

One category carries most of the weight here. Carrier accounts for 73% of the 2,144 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
73%
Late-arriving aircraft
10%
National Airspace System
9%
Extreme weather
8%

The largest share of delay minutes, 73%, 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 1,561 of the 2,144 delay minutes reported here. The split is drawn from 2,144 delay minutes reported on DL 2534.

Cancellations are rare at 0.30%, 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

Badly late arrivals are rare here: only 2.7% land an hour or more behind schedule, against 8.1% 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. 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.

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: 92.5% on time and 0.30% cancelled. That is a base rate, not a promise about any single 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