About 1 in 3 DL 4166 flights from Detroit arrived 15+ minutes late, diverted or cancelled over the past year (29%); 0.8% were cancelled. The typical flight landed 9 minutes early.
DL 4166: DTW → ATW
Scheduled to leave Detroit at 5:06 p.m. local time, operated by SkyWest as OO 4166. Over the past year it arrived on time 71% of the time (249 flights), in line with other DL flights on the route at that hour (70%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 37 | 70% |
| Tuesday | 36 | 61% |
| Wednesday | 34 | 76% |
| Thursday | 33 | 55% |
| Friday | 36 | 78% |
| Saturday | 36 | 81% |
| Sunday | 37 | 76% |
Why it was late
All flights DTW → ATW · Connecting off DL 4166? Check the risk
DL 4166: ATW → DTW
Scheduled to leave Appleton at 6:13 p.m. local time, operated by SkyWest as OO 4166. Over the past year it arrived on time 74% of the time (247 flights), in line with other DL flights on the route at that hour (74%). Last seen in the data Aug 31, 2026.
Usually Delta Air Lines's last flight of the day from Appleton to Detroit (100% of days). Delta Air Lines's last ATW–DTW flight was cancelled 0.8% of the time, against 1.5% 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 | 37 | 73% |
| Tuesday | 36 | 64% |
| Wednesday | 34 | 82% |
| Thursday | 33 | 61% |
| Friday | 36 | 75% |
| Saturday | 35 | 86% |
| Sunday | 36 | 81% |
Why it was late
All flights ATW → DTW · Connecting off DL 4166? Check the risk
Questions
How often is DL 4166 from DTW to ATW late?
Delta Air Lines 4166 from Detroit, MI to Appleton, WI arrived 15 or more minutes late, was diverted or was cancelled on 29% of 249 scheduled flights between September 2025 and August 2026. 0.8% were cancelled.
How often is DL 4166 from ATW to DTW late?
Delta Air Lines 4166 from Appleton, WI to Detroit, MI arrived 15 or more minutes late, was diverted or was cancelled on 26% of 247 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.