About 1 in 3 DL 5250 flights from New York arrived 15+ minutes late, diverted or cancelled over the past year (37%); 10.6% were cancelled. The typical flight landed 6 minutes early.
DL 5250: JFK → BUF
Scheduled to leave New York at 5:30 p.m. local time, operated by Endeavor Air as 9E 5250. Over the past year it arrived on time 63% of the time (348 flights), in line with other DL flights on the route at that hour (63%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 63% |
| Tuesday | 50 | 56% |
| Wednesday | 50 | 60% |
| Thursday | 50 | 62% |
| Friday | 49 | 80% |
| Saturday | 49 | 69% |
| Sunday | 49 | 53% |
Why it was late
All flights JFK → BUF · Connecting off DL 5250? Check the risk
DL 5250: BUF → JFK
Scheduled to leave Buffalo at 7:59 p.m. local time, operated by Endeavor Air as 9E 5250. Over the past year it arrived on time 66% of the time (347 flights), in line with other DL flights on the route at that hour (68%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Buffalo to New York (100% of days). Delta Air Lines's last BUF–JFK flight was cancelled 11.9% of the time, against 5.5% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 7:00 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 61% |
| Tuesday | 50 | 64% |
| Wednesday | 50 | 74% |
| Thursday | 49 | 67% |
| Friday | 49 | 76% |
| Saturday | 49 | 67% |
| Sunday | 49 | 55% |
Why it was late
All flights BUF → JFK · Connecting off DL 5250? Check the risk
Questions
How often is DL 5250 from JFK to BUF late?
Delta Air Lines 5250 from New York, NY to Buffalo, NY arrived 15 or more minutes late, was diverted or was cancelled on 37% of 348 scheduled flights between September 2025 and August 2026. 10.6% were cancelled.
How often is DL 5250 from BUF to JFK late?
Delta Air Lines 5250 from Buffalo, NY to New York, NY arrived 15 or more minutes late, was diverted or was cancelled on 34% of 347 scheduled flights between September 2025 and August 2026. 11.8% 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 Delta Air Lines for today's flight. Method.