About 1 in 10 AA 4788 flights from Buffalo arrived 15+ minutes late, diverted or cancelled over the past year (10%); 3.7% were cancelled. The typical flight landed 16 minutes early.
AA 4788: BUF → BOS
Scheduled to leave Buffalo at 7:00 a.m. local time, operated by Republic Airways as YX 4788. Over the past year it arrived on time 90% of the time (134 flights), in line with other AA flights on the route at that hour (88%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 21 | 100% |
| Tuesday | 21 | 90% |
| Wednesday | 21 | 86% |
| Thursday | 21 | 86% |
| Friday | 21 | 86% |
| Saturday | 15 | — |
| Sunday | 14 | — |
Why it was late
All flights BUF → BOS · Connecting off AA 4788? Check the risk
Questions
How often is AA 4788 from BUF to BOS late?
American Airlines 4788 from Buffalo, NY to Boston, MA arrived 15 or more minutes late, was diverted or was cancelled on 10% of 134 scheduled flights between September 2025 and August 2026. 3.7% 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.