Flight OddsWN4143 SJC → ONT
Southwest Airlines · San Jose, CA to Ontario, CA · 34 flights observed, 2025-07-01 to 2025-08-04 · 333 mi
WN4143 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
91%
Median delay
-8 min
90th percentile
+9 min
Cancellation rate
0%
How often is WN4143 on time?
Across 34 flights on SJC → ONT from 2025-07-01 to 2025-08-04, WN4143 arrived within 15 minutes of schedule 91% of the time. The median arrival delay was -8 min, and the worst 10% of flights arrived +9 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 | 31 | 91% |
| 16-30 min | 2 | 6% |
| 31-60 min | 1 | 3% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 30 | 90% | -6 min |
| 2025-08 | 4 | 100% | -5 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 80% |
| Tue | 5 | 100% |
| Wed | 5 | 80% |
| Thu | 5 | 80% |
| Fri | 4 | 100% |
| Sat | 5 | 100% |
| Sun | 5 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…