Flight OddsDL4231 CIU → DTW
Delta Air Lines · Sault Ste. Marie, MI to Detroit, MI · 363 flights observed, 2025-07-01 to 2026-06-30 · 285 mi
On-time arrival
83%
Median delay
-13 min
90th percentile
+64 min
Cancellation rate
6%
How often is DL4231 on time?
Across 363 flights on CIU → DTW from 2025-07-01 to 2026-06-30, DL4231 arrived within 15 minutes of schedule 83% of the time. The median arrival delay was -13 min, and the worst 10% of flights arrived +64 min or later. 6% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 284 | 83% |
| 16-30 min | 10 | 3% |
| 31-60 min | 11 | 3% |
| 61-120 min | 16 | 5% |
| 2+ hrs | 20 | 6% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 30 | 73% | +27 min |
| 2025-08 | 31 | 94% | 0 min |
| 2025-09 | 30 | 93% | -8 min |
| 2025-10 | 31 | 87% | -3 min |
| 2025-11 | 28 | 86% | -1 min |
| 2025-12 | 28 | 82% | +6 min |
| 2026-01 | 27 | 70% | +18 min |
| 2026-02 | 24 | 63% | +40 min |
| 2026-03 | 26 | 77% | +12 min |
| 2026-04 | 26 | 81% | +15 min |
| 2026-05 | 30 | 90% | -8 min |
| 2026-06 | 30 | 97% | -11 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 47 | 83% |
| Tue | 52 | 85% |
| Wed | 48 | 94% |
| Thu | 47 | 83% |
| Fri | 48 | 79% |
| Sat | 50 | 78% |
| Sun | 49 | 82% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…