Carrier route record

DLAUS→LAX

Delta Air Lines · Austin to Los Angeles

Flights: 1,286
Period: July 2025 to June 2026
Share of route: 32%
Carriers: 6

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

Delta on AUS to LAX lands a B, 5 points better than the national rate of 77.6%. About one flight in six 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 1,286 flights. The strongest carrier on the route with a full sample, United Airlines, flew 451 at 88.8% on time.

United Airlines is the most reliable of the four carriers covered here at 88.8% on time across 451 flights.

On time

83.0%

Arrivals under 15 minutes late, of 1,268 completed flights

Avg delay

69 min

Across delayed arrivals only, not all flights

Cancelled

1.09%

National rate is 1.81%

Whole route

81.3%

Every carrier on AUS to LAX, 4,077 flights

These figures cover 1,286 flights between July 2025 and June 2026. The median arrival is 9 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.

Carrier by carrier

Delta against every carrier on AUS to LAX

Delta flew 1,286 of the 4,077 flights on AUS to LAX, about 32% of it. Its 83.0% on time is 2 points better than the route as a whole, which runs 81.3%. Ranked by on-time rate it is number three of six carriers on the route, where the range runs from United at 88.8% to American at 71.5%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. United Airlines arrives on time 88.8% of the time; American Airlines manages 71.5%. Sample sizes sit next to every figure, because a two-point gap across 482 flights means less than a ten-point one.

On-time performance by carrier on AUS to LAX
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	451	88.8%	91 min	0.44%	A+
SkyWest Airlines	817	88.0%	71 min	0.49%	A+
Delta Air Lines (this page)	1,286	83.0%	69 min	1.09%	B
Spirit Airlinesthin sample	16	75.0%	54 min	0.00%	B+
Southwest Airlines	1,025	75.0%	52 min	0.49%	B+
American Airlines	482	71.5%	98 min	1.04%	C

The spread between United and American is 17 points, wide enough that it should decide the booking. On a hundred trips that is 17 more arrivals inside the on-time window.

Flight by flight

Delta flight numbers on AUS to LAX

DL 30607:2090.6% · 365 flights

Departure window

When Delta runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 13 points, against 17 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am365 flights90.6%
8am–11am—
11am–2pm115 flights90.2%
2pm–5pm517 flights78.0%
5pm–8pm245 flights78.7%
8pm–5am44 flights83.7%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 90.6% of the time, against 78.0% for the afternoon window. That is 13 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 517 flights scheduled in it.

Across the year

Delta on AUS to LAX through the year

Darker means more delays. Figures are on-time percentages.September best, July worst

July is the worst month at 64.0% on time, 29 points below September, the best at 92.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. May was the busiest month here, with 118 flights.

Across the week, Wednesday is the strongest day at 87.8% on time and Monday the weakest at 76.5%. 11 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Delta runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 46% of the 15,000 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.

Late-arriving aircraft
46%
Carrier
44%
National Airspace System
8%
Extreme weather
2%

46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 15,000 reported delay minutes here, that single category outweighs weather by 23 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 14,943 reported delay minutes.

The largest share of delay minutes, 44%, 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 6,542 of the 15,000 delay minutes reported here.

Cancellations sit at 1.09% against a national 1.81%, which is ordinary. Diversions add another 0.31%.

Connections and stage length

What a delay here costs

5.6% 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.

The 1,242 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 return leg runs 81.5% on time across 1,285 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

The sample behind these figures is 1,286 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.

What to do with this

Booking Delta on AUS to LAX

Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 92.5% on time and July 64.0%, a swing of 29 points. If the dates move at all, move them out of July before you think about anything else. 1,268 completed flights over 12 months sit behind that.

Where to go next

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