Flight OddsDL4027 SEA → ONT
Delta Air Lines · Seattle, WA to Ontario, CA · 280 flights observed, 2025-07-01 to 2026-04-12 · 956 mi
DL4027 covers more than one route in the data window — the stats below are for SEA → ONT, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
89%
Median delay
-9 min
90th percentile
+16 min
Cancellation rate
0%
How often is DL4027 on time?
Across 280 flights on SEA → ONT from 2025-07-01 to 2026-04-12, DL4027 arrived within 15 minutes of schedule 89% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +16 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 249 | 89% |
| 16-30 min | 9 | 3% |
| 31-60 min | 13 | 5% |
| 61-120 min | 5 | 2% |
| 2+ hrs | 3 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 84% | -4 min |
| 2025-08 | 31 | 100% | -10 min |
| 2025-09 | 30 | 83% | +1 min |
| 2025-10 | 31 | 84% | +2 min |
| 2025-11 | 28 | 96% | -5 min |
| 2025-12 | 28 | 89% | -8 min |
| 2026-01 | 30 | 93% | -8 min |
| 2026-02 | 28 | 89% | +2 min |
| 2026-03 | 30 | 83% | +0 min |
| 2026-04 | 12 | 92% | +3 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 40 | 90% |
| Tue | 41 | 93% |
| Wed | 39 | 87% |
| Thu | 38 | 89% |
| Fri | 39 | 74% |
| Sat | 41 | 100% |
| Sun | 41 | 90% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…