About 1 in 4 AA 4637 flights from Philadelphia arrived 15+ minutes late, diverted or cancelled over the past year (27%); 3.8% were cancelled. The typical flight landed 11 minutes early.
AA 4637: PHL → IND
Scheduled to leave Philadelphia at 6:40 p.m. local time, operated by Republic Airways as YX 4637. Over the past year it arrived on time 73% of the time (320 flights), in line with other AA flights on the route at that hour (70%). Last seen in the data Aug 31, 2026.
Usually American Airlines's last flight of the day from Philadelphia to Indianapolis (63% of days). American Airlines's last PHL–IND flight was cancelled 3.9% of the time, against 4.2% for its earlier ones. If it's cancelled, the next American Airlines flight is usually around 8:22 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 47 | 72% |
| Tuesday | 45 | 80% |
| Wednesday | 45 | 78% |
| Thursday | 45 | 64% |
| Friday | 46 | 76% |
| Saturday | 46 | 78% |
| Sunday | 46 | 61% |
Why it was late
All flights PHL → IND · Connecting off AA 4637? Check the risk
Questions
How often is AA 4637 from PHL to IND late?
American Airlines 4637 from Philadelphia, PA to Indianapolis, IN arrived 15 or more minutes late, was diverted or was cancelled on 27% of 320 scheduled flights between September 2025 and August 2026. 3.8% 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.