About 1 in 6 DL 4959 flights from Jacksonville arrived 15+ minutes late, diverted or cancelled over the past year (15%); 4.3% were cancelled. The typical flight landed 13 minutes early.
DL 4959: JAX → JFK
Scheduled to leave Jacksonville at 7:00 a.m. local time, operated by Endeavor Air as 9E 4959. Over the past year it arrived on time 85% of the time (349 flights), in line with other DL flights on the route at that hour (84%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 78% |
| Tuesday | 50 | 76% |
| Wednesday | 50 | 96% |
| Thursday | 50 | 88% |
| Friday | 50 | 88% |
| Saturday | 49 | 86% |
| Sunday | 49 | 80% |
Why it was late
All flights JAX → JFK · Connecting off DL 4959? Check the risk
Questions
How often is DL 4959 from JAX to JFK late?
Delta Air Lines 4959 from Jacksonville, FL to New York, NY arrived 15 or more minutes late, was diverted or was cancelled on 15% of 349 scheduled flights between September 2025 and August 2026. 4.3% 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 Delta Air Lines for today's flight. Method.