About 1 in 3 DL 3964 flights from Detroit arrived 15+ minutes late, diverted or cancelled over the past year (30%); 0.9% were cancelled. The typical flight landed 7 minutes early.
DL 3964: DTW → MBS
Scheduled to leave Detroit at 4:35 p.m. local time, operated by SkyWest as OO 3964. Over the past year it arrived on time 70% of the time (220 flights), in line with other DL flights on the route at that hour (70%). Last seen in the data Aug 30, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 35 | 69% |
| Tuesday | 34 | 71% |
| Wednesday | 34 | 85% |
| Thursday | 34 | 71% |
| Friday | 32 | 69% |
| Saturday | 17 | — |
| Sunday | 34 | 65% |
Why it was late
All flights DTW → MBS · Connecting off DL 3964? Check the risk
DL 3964: MBS → DTW
Scheduled to leave Saginaw at 6:15 p.m. local time, operated by SkyWest as OO 3964. Over the past year it arrived on time 73% of the time (181 flights), better than other DL flights on the route at that hour (69%). Last seen in the data Aug 30, 2026.
Usually Delta Air Lines's last flight of the day from Saginaw to Detroit (100% of days). Delta Air Lines's last MBS–DTW flight was cancelled 1.1% of the time, against 1.0% for its earlier ones. If it's cancelled, the next Delta Air Lines flight is usually around 6:55 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 29 | 76% |
| Tuesday | 28 | 64% |
| Wednesday | 28 | 82% |
| Thursday | 28 | 79% |
| Friday | 27 | 78% |
| Saturday | 12 | — |
| Sunday | 29 | 62% |
Why it was late
All flights MBS → DTW · Connecting off DL 3964? Check the risk
Questions
How often is DL 3964 from DTW to MBS late?
Delta Air Lines 3964 from Detroit, MI to Saginaw/Bay City/Midland, MI arrived 15 or more minutes late, was diverted or was cancelled on 30% of 220 scheduled flights between September 2025 and August 2026. 0.9% were cancelled.
How often is DL 3964 from MBS to DTW late?
Delta Air Lines 3964 from Saginaw/Bay City/Midland, MI to Detroit, MI arrived 15 or more minutes late, was diverted or was cancelled on 27% of 181 scheduled flights between September 2025 and August 2026. 1.1% 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.