Flight OddsDL509 DTW → SFO
Delta Air Lines · Detroit, MI to San Francisco, CA · 144 flights observed, 2025-07-01 to 2026-06-29 · 2,079 mi
DL509 covers more than one route in the data window — the stats below are for DTW → SFO, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
57%
Median delay
+10 min
90th percentile
+96 min
Cancellation rate
1%
How often is DL509 on time?
Across 144 flights on DTW → SFO from 2025-07-01 to 2026-06-29, DL509 arrived within 15 minutes of schedule 57% of the time. The median arrival delay was +10 min, and the worst 10% of flights arrived +96 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 82 | 57% |
| 16-30 min | 16 | 11% |
| 31-60 min | 24 | 17% |
| 61-120 min | 10 | 7% |
| 2+ hrs | 11 | 8% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 19 | 63% | +21 min |
| 2025-08 | 6 | 50% | +29 min |
| 2025-12 | 8 | 25% | +64 min |
| 2026-01 | 30 | 63% | +51 min |
| 2026-02 | 28 | 75% | +10 min |
| 2026-03 | 28 | 64% | +58 min |
| 2026-04 | 10 | 40% | +27 min |
| 2026-06 | 14 | 21% | +48 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 25 | 44% |
| Tue | 17 | 71% |
| Wed | 15 | 60% |
| Thu | 23 | 65% |
| Fri | 24 | 58% |
| Sat | 12 | 58% |
| Sun | 27 | 52% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…