Carrier route record

AAATL→LAX

American Airlines · Atlanta to Los Angeles

Flights: 377
Period: September 2025 to August 2026
Share of route: 8%
Carriers: 4

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

American on ATL to LAX sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land close to two hours behind schedule. That rests on 377 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 3,817 at 79.1% on time.

The national on-time rate over the same period is 77.3%, so American on ATL to LAX runs 4 points behind the country as a whole. Across a thousand flights that is about 43 extra late arrivals.

On time

73.0%

Arrivals under 15 minutes late, of 374 completed flights

Avg delay

120 min

Across delayed arrivals only, not all flights

Cancelled

0.80%

National rate is 1.89%

Whole route

77.8%

Every carrier on ATL to LAX, 4,851 flights

These figures cover 377 flights between September 2025 and August 2026. Beyond the headline rate, 11.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

American against every carrier on ATL to LAX

American flew 377 of the 4,851 flights on ATL to LAX, about 8% of it. Its 73.0% on time is 5 points worse than the route as a whole, which runs 77.8%. Ranked by on-time rate it is number three 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 choice of carrier is not cosmetic here. Delta Air Lines arrives on time 79.1% of the time; Frontier Airlines manages 70.5%. Sample sizes sit next to every figure, because a two-point gap across 490 flights means less than a ten-point one.

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

Delta leads Frontier by 9 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

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Departure window

When American runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 10 points, against 9 points between the best and worst carrier.

5am–8am19 flights—
8am–11am—
11am–2pm—
2pm–5pm85 flights80.0%
5pm–8pm273 flights69.6%
8pm–5am—

Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.

The best window here is not the first bank but the 2pm–5pm slot at 80.0% on time, ahead of 5pm–8pm at 69.6%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 5pm–8pm window is the busiest, with 273 flights scheduled in it.

Across the year

American 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 45.2% on time, 45 points below March, the best at 90.0%. 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. November was the busiest month here, with 39 flights.

Across the week, Wednesday is the strongest day at 80.8% on time and Monday the weakest at 67.3%, a spread of 14 points.

Arrival by arrival

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

American on ATL to LAX often beats the schedule: 140 of 374 completed flights, 37%, arrived 15 minutes or more early. The 101 late arrivals split 27 under half an hour, 31 between 30 and 60 minutes, and 43 an hour or more.

15+ min early140 flights37.4%
Within 15 min133 flights35.6%
15–29 min late27 flights7.2%
30–59 min late31 flights8.3%
1–2 hours late20 flights5.3%
2+ hours late23 flights6.1%

Scale runs 0% to 100%.

Share of 374 completed flights by arrival against schedule.

A late pushback is often recovered here: of 137 departures that left 15 minutes late or more, 43 still arrived on time. Only 7 left on time and still arrived late.

The worst days

Worst days for American on ATL to LAX

The latest arrival of the period was on 10 July 2026, 17 hours 45 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in July 2026.

The latest arrivals of American on ATL to LAX in the period
Date	Arrived late by	Largest filed cause
10 July 2026	17 hours 45 minutes	Late-arriving aircraft
7 October 2025	17 hours 2 minutes	Carrier
24 July 2026	16 hours 34 minutes	Carrier
15 July 2026	15 hours 53 minutes	Carrier
14 June 2026	7 hours 33 minutes	Late-arriving aircraft

Delay causes

Why American runs late on this route

Late-arriving aircraft accounts for 55% of the 12,000 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
55%
Carrier
37%
National Airspace System
5%
Extreme weather
3%
Security
0%

55% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 12,000 reported delay minutes here, that single category outweighs weather by 21 to one. The split is drawn from 12,132 reported delay minutes.

The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,491 of the 12,000 delay minutes reported here.

Cancellations are rare at 0.80%, 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

11.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.

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 is a different operation and performs like one: it runs 66.5% on time across 376 flights, 7 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 7 points of difference.

One caution: this is a thin sample. 377 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 American on ATL to LAX

Put together: treat all of this as provisional. 377 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 73.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 374 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