Carrier route record
AALAX→ORD
American Airlines · Los Angeles to Chicago
- Flights
- 3,051
- 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 LAX to ORD sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 3,051 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.6%, so American on LAX to ORD runs 5 points behind the country as a whole. Across a thousand flights that is about 47 extra late arrivals.
Key figures
On time
72.9%
Arrivals under 15 minutes late, of 2,953 completed flights
Avg delay
96 min
Across delayed arrivals only, not all flights
Cancelled
2.33%
National rate is 1.81%
Whole route
76.4%
Every carrier on LAX to ORD, 6,964 flights
These figures cover 3,051 flights between July 2025 and June 2026. Beyond the headline rate, 11.9% 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 LAX to ORD
American flew 3,051 of the 6,964 flights on LAX to ORD, about 44% of it. Its 72.9% on time is 4 points worse than the route as a whole, which runs 76.4%. Ranked by on-time rate it is number three of five carriers on the route, where the range runs from United at 80.5% to Frontier at 61.4%. 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 | 80.5% | 67 min | 0.74% | B+ |
| Spirit Airlinesthin sample | 240 | 77.7% | 75 min | 4.17% | B− |
| American Airlines (this page) | 3,051 | 72.9% | 96 min | 2.33% | C |
| Delta Air Linesthin sample | 66 | 68.3% | 86 min | 0.00% | C+ |
| Frontier Airlinesthin sample | 227 | 61.4% | 149 min | 4.85% | D− |
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 29 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–8am509 flights89.0%
- 8am–11am747 flights74.0%
- 11am–2pm493 flights63.8%
- 2pm–5pm363 flights60.0%
- 5pm–8pm355 flights67.3%
- 8pm–5am584 flights76.1%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.0% of the time, against 60.0% for the afternoon window. That is 29 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 747 flights scheduled in it.
Across the year
American on LAX to ORD through the year
August is the worst month at 66.5% on time, 16 points below February, the best at 82.6%. 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 78.3% on time and Sunday the weakest at 66.1%. 12 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 49% of the 77,000 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.
- 49%Late-arriving aircraft
- 34%Carrier
- 17%National Airspace System
- 0%Extreme weather
- 0%Security
49% 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 77,000 reported delay minutes here, that single category outweighs weather by 49 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 76,599 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 89.0% on time here.
Cancellations sit at 2.33% against a national 1.81%, which is ordinary. Diversions add another 0.88%.
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. 11.9% 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 68.6% on time across 3,052 flights, 4 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 4 points of difference.
The sample behind these figures is 3,051 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 LAX to ORD
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 82.6% on time and August 66.5%, a swing of 16 points. If the dates move at all, move them out of August before you think about anything else. 2,953 completed flights over 12 months sit behind that.
Related
Where to go next
- LAX to ORD, every carrier
- American on ORD to LAX, the return leg
- United Airlines on LAX to ORD80.5%
- Spirit Airlines on LAX to ORD77.7%
- Frontier Airlines on LAX to ORD61.4%
- American Airlines network-wide record
- Los Angeles International (LAX) delay statistics
- Chicago O'Hare International (ORD) 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.