Flight OddsWN4255 SJC → ONT
Southwest Airlines · San Jose, CA to Ontario, CA · 58 flights observed, 2026-04-07 to 2026-06-03 · 333 mi
WN4255 covers more than one route in the data window — the stats below are for SJC → ONT, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
83%
Median delay
+2 min
90th percentile
+28 min
Cancellation rate
0%
How often is WN4255 on time?
Across 58 flights on SJC → ONT from 2026-04-07 to 2026-06-03, WN4255 arrived within 15 minutes of schedule 83% of the time. The median arrival delay was +2 min, and the worst 10% of flights arrived +28 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 | 48 | 83% |
| 16-30 min | 5 | 9% |
| 31-60 min | 4 | 7% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 1 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 24 | 88% | +3 min |
| 2026-05 | 31 | 77% | +10 min |
| 2026-06 | 3 | 100% | -15 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 8 | 88% |
| Tue | 9 | 78% |
| Wed | 9 | 78% |
| Thu | 8 | 100% |
| Fri | 8 | 88% |
| Sat | 8 | 75% |
| Sun | 8 | 75% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…