Carrier route record

DLATL→LAX

Delta Air Lines · Atlanta to Los Angeles

Flights: 3,817
Period: September 2025 to August 2026
Share of route: 79%
Carriers: 4

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

Delta on ATL to LAX lands a B+, 2 points 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 3,817 flights. The strongest carrier on the route with a full sample, American Airlines, flew 377 at 73.0% on time.

The US average over the same twelve months is 77.3%, so there is little to separate Delta on ATL to LAX from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

79.1%

Arrivals under 15 minutes late, of 3,784 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

0.73%

National rate is 1.89%

Whole route

77.8%

Every carrier on ATL to LAX, 4,851 flights

These figures cover 3,817 flights between September 2025 and August 2026. The median arrival is 4 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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Carrier by carrier

Delta against every carrier on ATL to LAX

Delta flew 3,817 of the 4,851 flights on ATL to LAX, most of the route. Its 79.1% on time is about level with the route as a whole at 77.8%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from Delta at 79.1% to Frontier at 70.5%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The two carriers here are closely matched: 3 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

On-time performance by carrier on ATL to LAX
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines (this page)	3,817	79.1%	57 min	0.73%	B+
Spirit Airlinesthin sample	167	78.9%	92 min	0.60%	B+
American Airlines	377	73.0%	120 min	0.80%	C+
Frontier Airlines	490	70.5%	61 min	1.63%	C

No carrier stands out. American tops the table at 73.0%, 3 points clear of the bottom, which is inside the range this kind of sample moves year to year.

Flight by flight

Delta flight numbers on ATL to LAX

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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 21 points, against 3 points between the best and worst carrier.

5am–8am367 flights88.2%
8am–11am957 flights86.7%
11am–2pm486 flights88.0%
2pm–5pm774 flights75.8%
5pm–8pm612 flights67.4%
8pm–5am621 flights70.8%

Scale runs 60% to 95%.

Book the early departure. Flights leaving between 5am–8am arrive on time 88.2% of the time, against 67.4% for the evening window. That is 21 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 957 flights scheduled in it.

Across the year

Delta on ATL to LAX through the year

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

July is the worst month at 70.0% on time, 16 points below March, the best at 86.3%. 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. July was the busiest month here, with 356 flights.

Across the week, Wednesday is the strongest day at 84.7% on time and Sunday the weakest at 74.1%, a spread of 11 points.

Arrival by arrival

How late Delta on ATL to LAX runs when it is late

Delta on ATL to LAX often beats the schedule: 993 of 3,784 completed flights, 26%, arrived 15 minutes or more early. The 789 late arrivals split 319 under half an hour, 246 between 30 and 60 minutes, and 224 an hour or more.

15+ min early993 flights26.2%
Within 15 min2,002 flights52.9%
15–29 min late319 flights8.4%
30–59 min late246 flights6.5%
1–2 hours late151 flights4.0%
2+ hours late73 flights1.9%

Scale runs 0% to 100%.

Share of 3,784 completed flights by arrival against schedule.

241 of 821 late departures made up the time and arrived on time, 29% of them. In the other direction, 209 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAX.

The worst days

Worst days for Delta on ATL to LAX

The latest arrival of the period was on 27 August 2026, 14 hours 47 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.

The latest arrivals of Delta on ATL to LAX in the period
Date	Arrived late by	Largest filed cause
27 August 2026	14 hours 47 minutes	Carrier
13 April 2026	13 hours 22 minutes	Extreme weather
18 September 2025	12 hours 28 minutes	Carrier
8 July 2026	8 hours 22 minutes	Carrier
2 July 2026	7 hours 3 minutes	Carrier

Delay causes

Why Delta runs late on this route

Carrier accounts for 58% of the 45,000 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
58%
National Airspace System
19%
Late-arriving aircraft
15%
Extreme weather
7%
Security
1%

The largest share of delay minutes, 58%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 26,000 of the 45,000 delay minutes reported here. The split is drawn from 44,759 reported delay minutes.

Cancellations are rare at 0.73%, 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 stage length

What a delay here costs

5.9% 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.

At 1,947 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The return leg runs 80.8% on time across 3,811 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 3,817 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 ATL to LAX

Put together: the calendar is the biggest lever here, not the carrier or the hour. March runs 86.3% on time and July 70.0%, a swing of 16 points. If the dates move at all, move them out of July before you think about anything else. 3,784 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures