Flight OddsDL3979 GRR → DTW
Delta Air Lines · Grand Rapids, MI to Detroit, MI · 36 flights observed, 2026-03-08 to 2026-04-12 · 120 mi
DL3979 covers more than one route in the data window — the stats below are for GRR → DTW, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
71%
Median delay
-2 min
90th percentile
+102 min
Cancellation rate
3%
How often is DL3979 on time?
Across 36 flights on GRR → DTW from 2026-03-08 to 2026-04-12, DL3979 arrived within 15 minutes of schedule 71% of the time. The median arrival delay was -2 min, and the worst 10% of flights arrived +102 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 25 | 71% |
| 16-30 min | 2 | 6% |
| 31-60 min | 3 | 9% |
| 61-120 min | 2 | 6% |
| 2+ hrs | 3 | 9% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 23 | 65% | +35 min |
| 2026-04 | 12 | 83% | +4 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 60% |
| Tue | 5 | 60% |
| Wed | 4 | 50% |
| Thu | 5 | 40% |
| Fri | 5 | 100% |
| Sat | 5 | 80% |
| Sun | 6 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…