About 1 in 4 DL 3909 flights from Detroit arrived 15+ minutes late, diverted or cancelled over the past year (26%); 3.8% were cancelled. The typical flight landed 9 minutes early.
DL 3909: DTW → AZO
Scheduled to leave Detroit at 10:55 p.m. local time, operated by SkyWest as OO 3909. Over the past year it arrived on time 74% of the time (320 flights), in line with other DL flights on the route at that hour (73%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Detroit to Kalamazoo (100% of days). Delta Air Lines's last DTW–AZO flight was cancelled 3.6% of the time, against 1.8% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 10:05 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 73% |
| Tuesday | 41 | 76% |
| Wednesday | 41 | 68% |
| Thursday | 49 | 71% |
| Friday | 49 | 73% |
| Saturday | 40 | 90% |
| Sunday | 49 | 69% |
Why it was late
All flights DTW → AZO · Connecting off DL 3909? Check the risk
Questions
How often is DL 3909 from DTW to AZO late?
Delta Air Lines 3909 from Detroit, MI to Kalamazoo, MI arrived 15 or more minutes late, was diverted or was cancelled on 26% of 320 scheduled flights between September 2025 and August 2026. 3.8% 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.