About 1 in 6 DL 5223 flights from New York arrived 15+ minutes late, diverted or cancelled over the past year (16%); 3.2% were cancelled. The typical flight landed 14 minutes early.
DL 5223: JFK → BUF
Scheduled to leave New York at 8:00 a.m. local time, operated by Endeavor Air as 9E 5223. Over the past year it arrived on time 84% of the time (339 flights), in line with other DL flights on the route at that hour (82%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 84% |
| Tuesday | 50 | 80% |
| Wednesday | 50 | 88% |
| Thursday | 49 | 86% |
| Friday | 49 | 86% |
| Saturday | 41 | 85% |
| Sunday | 49 | 78% |
Why it was late
All flights JFK → BUF · Connecting off DL 5223? Check the risk
Questions
How often is DL 5223 from JFK to BUF late?
Delta Air Lines 5223 from New York, NY to Buffalo, NY arrived 15 or more minutes late, was diverted or was cancelled on 16% of 339 scheduled flights between September 2025 and August 2026. 3.2% 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.