Flight OddsDL4639 DTW → BUF
Delta Air Lines · Detroit, MI to Buffalo, NY · 37 flights observed, 2026-01-19 to 2026-06-05 · 241 mi
DL4639 covers more than one route in the data window — the stats below are for DTW → BUF, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
78%
Median delay
-10 min
90th percentile
+77 min
Cancellation rate
3%
How often is DL4639 on time?
Across 37 flights on DTW → BUF from 2026-01-19 to 2026-06-05, DL4639 arrived within 15 minutes of schedule 78% of the time. The median arrival delay was -10 min, and the worst 10% of flights arrived +77 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 | 28 | 78% |
| 16-30 min | 1 | 3% |
| 31-60 min | 2 | 6% |
| 61-120 min | 2 | 6% |
| 2+ hrs | 3 | 8% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 6 | 67% | +44 min |
| 2026-02 | 5 | 60% | +9 min |
| 2026-05 | 20 | 85% | +3 min |
| 2026-06 | 5 | 80% | +18 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 8 | 63% |
| Tue | 4 | 50% |
| Wed | 4 | 75% |
| Thu | 8 | 100% |
| Fri | 8 | 75% |
| Sat | No data | — |
| Sun | 4 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…