About 1 in 3 AA 1543 flights from Chicago arrived 15+ minutes late, diverted or cancelled over the past year (37%); 3.4% were cancelled. The typical flight landed 3 minutes late.
AA 1543: ORD → SAN
Scheduled to leave Chicago at 5:49 p.m. local time. Over the past year it arrived on time 63% of the time (237 flights), worse than other AA flights on the route at that hour (66%). Last seen in the data Aug 31, 2026.
Usually American Airlines's last flight of the day from Chicago to San Diego (65% of days). American Airlines's last ORD–SAN flight was cancelled 3.3% of the time, against 1.0% for its earlier ones. If it's cancelled, the next American Airlines flight is usually around 6:45 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 36 | 67% |
| Tuesday | 34 | 68% |
| Wednesday | 34 | 59% |
| Thursday | 33 | 48% |
| Friday | 34 | 74% |
| Saturday | 31 | 74% |
| Sunday | 35 | 51% |
Why it was late
All flights ORD → SAN · Connecting off AA 1543? Check the risk
Questions
How often is AA 1543 from ORD to SAN late?
American Airlines 1543 from Chicago, IL to San Diego, CA arrived 15 or more minutes late, was diverted or was cancelled on 37% of 237 scheduled flights between September 2025 and August 2026. 3.4% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check American Airlines for today's flight. Method.