Flight OddsWN4879 SJC → ONT
Southwest Airlines · San Jose, CA to Ontario, CA · 27 flights observed, 2026-06-04 to 2026-06-30 · 333 mi
WN4879 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
100%
Median delay
-14 min
90th percentile
-6 min
Cancellation rate
4%
How often is WN4879 on time?
Across 27 flights on SJC → ONT from 2026-06-04 to 2026-06-30, WN4879 arrived within 15 minutes of schedule 100% of the time. The median arrival delay was -14 min, and the worst 10% of flights arrived -6 min or later. 4% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 26 | 100% |
| 16-30 min | 0 | 0% |
| 31-60 min | 0 | 0% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-06 | 26 | 100% | -13 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 100% |
| Tue | 4 | 100% |
| Wed | 3 | 100% |
| Thu | 4 | 100% |
| Fri | 4 | 100% |
| Sat | 4 | 100% |
| 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…