About 5 in 10 AA 431 flights from Chicago arrived 15+ minutes late, diverted or cancelled over the past year (54%); 2.1% were cancelled. The typical flight landed 18 minutes late.
AA 431: ORD → SAT
Scheduled to leave Chicago at 9:19 p.m. local time. Over the past year it arrived on time 46% of the time (143 flights), better than other AA flights on the route at that hour (37%). Last seen in the data Aug 31, 2026.
Usually American Airlines's last flight of the day from Chicago to San Antonio (100% of days). American Airlines's last ORD–SAT flight was cancelled 3.0% of the time, against 1.9% for its earlier ones. If it's cancelled, the next American Airlines flight is usually around 10:05 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 24 | 46% |
| Tuesday | 18 | — |
| Wednesday | 18 | — |
| Thursday | 23 | 35% |
| Friday | 18 | — |
| Saturday | 19 | — |
| Sunday | 23 | 43% |
Why it was late
All flights ORD → SAT · Connecting off AA 431? Check the risk
Questions
How often is AA 431 from ORD to SAT late?
American Airlines 431 from Chicago, IL to San Antonio, TX arrived 15 or more minutes late, was diverted or was cancelled on 54% of 143 scheduled flights between September 2025 and August 2026. 2.1% 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.