About 1 in 3 DL 4640 flights from Detroit arrived 15+ minutes late, diverted or cancelled over the past year (30%); 0.8% were cancelled. The typical flight landed 5 minutes early.
DL 4640: DTW → PIT
Scheduled to leave Detroit at 2:20 p.m. local time, operated by Endeavor Air as 9E 4640. Over the past year it arrived on time 70% of the time (129 flights), worse than other DL flights on the route at that hour (78%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 19 | — |
| Tuesday | 18 | — |
| Wednesday | 18 | — |
| Thursday | 19 | — |
| Friday | 19 | — |
| Saturday | 17 | — |
| Sunday | 19 | — |
Why it was late
All flights DTW → PIT · Connecting off DL 4640? Check the risk
Questions
How often is DL 4640 from DTW to PIT late?
Delta Air Lines 4640 from Detroit, MI to Pittsburgh, PA arrived 15 or more minutes late, was diverted or was cancelled on 30% of 129 scheduled flights between September 2025 and August 2026. 0.8% 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.