Flight OddsDL4042 ONT → SEA
Delta Air Lines · Ontario, CA to Seattle, WA · 286 flights observed, 2025-07-01 to 2026-04-12 · 956 mi
DL4042 covers more than one route in the data window — the stats below are for ONT → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
95%
Median delay
-9 min
90th percentile
+10 min
Cancellation rate
0%
How often is DL4042 on time?
Across 286 flights on ONT → SEA from 2025-07-01 to 2026-04-12, DL4042 arrived within 15 minutes of schedule 95% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +10 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 | 269 | 95% |
| 16-30 min | 9 | 3% |
| 31-60 min | 0 | 0% |
| 61-120 min | 1 | 0% |
| 2+ hrs | 5 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 97% | -6 min |
| 2025-08 | 31 | 94% | -1 min |
| 2025-09 | 29 | 97% | +18 min |
| 2025-10 | 31 | 97% | -11 min |
| 2025-11 | 30 | 97% | -16 min |
| 2025-12 | 30 | 97% | -14 min |
| 2026-01 | 31 | 87% | -3 min |
| 2026-02 | 28 | 96% | -14 min |
| 2026-03 | 31 | 90% | +2 min |
| 2026-04 | 12 | 100% | -9 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 40 | 95% |
| Tue | 41 | 95% |
| Wed | 40 | 95% |
| Thu | 40 | 90% |
| Fri | 41 | 90% |
| Sat | 41 | 98% |
| Sun | 41 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…