About 1 in 4 AA 4378 flights from New York arrived 15+ minutes late, diverted or cancelled over the past year (24%); 4.8% were cancelled. The typical flight landed 3 minutes early.
AA 4378: JFK → RDU
Scheduled to leave New York at 9:40 a.m. local time, operated by Republic Airways as YX 4378. Over the past year it arrived on time 76% of the time (210 flights), worse than other AA flights on the route at that hour (80%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 31 | 71% |
| Tuesday | 30 | 80% |
| Wednesday | 29 | 86% |
| Thursday | 28 | 75% |
| Friday | 31 | 77% |
| Saturday | 31 | 81% |
| Sunday | 30 | 63% |
Why it was late
All flights JFK → RDU · Connecting off AA 4378? Check the risk
Questions
How often is AA 4378 from JFK to RDU late?
American Airlines 4378 from New York, NY to Raleigh/Durham, NC arrived 15 or more minutes late, was diverted or was cancelled on 24% of 210 scheduled flights between September 2025 and August 2026. 4.8% 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.