Carrier route record
AAORD→LAX
American Airlines · Chicago to Los Angeles
- Flights
- 3,052
- Period
- July 2025 to June 2026
- Share of route
- 44%
- Carriers
- 5
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with American Airlines.
American on ORD to LAX sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 3,052 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.6%, so American on ORD to LAX runs 9 points behind the country as a whole. Across a thousand flights that is about 90 extra late arrivals.
Key figures
On time
68.6%
Arrivals under 15 minutes late, of 2,978 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
2.29%
National rate is 1.81%
Whole route
72.5%
Every carrier on ORD to LAX, 6,961 flights
These figures cover 3,052 flights between July 2025 and June 2026. Beyond the headline rate, 11.7% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
American against every carrier on ORD to LAX
American flew 3,052 of the 6,961 flights on ORD to LAX, about 44% of it. Its 68.6% on time is 4 points worse than the route as a whole, which runs 72.5%. Ranked by on-time rate it is number three of five carriers on the route, where the range runs from United at 76.5% to Delta at 60.6%. Three of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 3,380 | 76.5% | 69 min | 0.65% | B+ |
| Spirit Airlinesthin sample | 235 | 74.4% | 88 min | 3.40% | C− |
| American Airlines (this page) | 3,052 | 68.6% | 75 min | 2.29% | C |
| Frontier Airlinesthin sample | 228 | 66.4% | 75 min | 4.82% | C− |
| Delta Air Linesthin sample | 66 | 60.6% | 57 min | 0.00% | D+ |
Flight by flight
American flight numbers on ORD to LAX
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 28 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am683 flights83.0%
- 8am–11am561 flights72.0%
- 11am–2pm423 flights69.5%
- 2pm–5pm435 flights66.3%
- 5pm–8pm492 flights58.6%
- 8pm–5am458 flights54.6%
Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 54.6% on time, against 83.0% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 683 flights scheduled in it.
Across the year
American on ORD to LAX through the year
June is the worst month at 54.5% on time, 24 points below May, the best at 78.3%. 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. June was the busiest month here, with 296 flights.
Across the week, Tuesday is the strongest day at 72.8% on time and Sunday the weakest at 64.7%. 8 points is a smaller lever than departure hour, but it is free.
Delay causes
Why American runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 70,000 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.
- 43%Late-arriving aircraft
- 34%Carrier
- 15%National Airspace System
- 7%Extreme weather
- 0%Security
43% 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 70,000 reported delay minutes here, that single category outweighs weather by 6 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 70,458 reported delay minutes.
The largest share of delay minutes, 34%, 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 24,000 of the 70,000 delay minutes reported here.
Cancellations sit at 2.29% against a national 1.81%, which is ordinary. Diversions add another 0.13%.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.7% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
At 1,744 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 72.9% on time across 3,051 flights, 4 points above 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 4 points of difference.
The sample behind these figures is 3,052 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 American on ORD to LAX
Put together: the calendar is the biggest lever here, not the carrier or the hour. May runs 78.3% on time and June 54.5%, a swing of 24 points. If the dates move at all, move them out of June before you think about anything else. 2,978 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to LAX, every carrier
- American on LAX to ORD, the return leg
- United Airlines on ORD to LAX76.5%
- Spirit Airlines on ORD to LAX74.4%
- Frontier Airlines on ORD to LAX66.4%
- American Airlines network-wide record
- Chicago O'Hare International (ORD) delay statistics
- Los Angeles International (LAX) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
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.