Route
ONT → SJC
Ontario International Airport Mineta San Jose International Airport
How punctual is this route?
- On-time arrivals
- 85.9%
- Less than 15 minutes late
- Cancelled
- 0.1%
- Of scheduled flights
- Average delay when late
- 62 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,320
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 80%
- Airline (crew, maintenance, cleaning) 19%
- Air traffic control & airport 2%
- Security 0%
- Extreme weather 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 86.0% | 107 |
| October 2025 | 78.2% | 110 |
| November 2025 | 83.9% | 118 |
| December 2025 | 90.6% | 118 |
| January 2026 | 94.1% | 101 |
| February 2026 | 90.9% | 99 |
| March 2026 | 83.2% | 107 |
| April 2026 | 84.0% | 106 |
| May 2026 | 91.8% | 110 |
| June 2026 | 75.4% | 114 |
| July 2026 | 81.5% | 119 |
| August 2026 | 92.8% | 111 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 1,320 | 85.9% | 0.1% | 62 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3996
5% late · 64 flights
-
WN3164
33% late · 60 flights
-
WN3845
32% late · 60 flights
-
WN1368
0% late · 58 flights
-
WN3674
28% late · 58 flights
-
WN2057
2% late · 57 flights
-
WN3041
13% late · 47 flights
-
WN441
5% late · 43 flights
-
WN3997
10% late · 42 flights
-
WN4540
25% late · 40 flights
-
WN3162
17% late · 36 flights
-
WN2034
3% late · 33 flights
-
WN752
24% late · 33 flights
-
WN106
3% late · 32 flights
-
WN1698
10% late · 31 flights
-
WN2977
23% late · 31 flights
-
WN3673
26% late · 31 flights
-
WN3957
0% late · 31 flights
-
WN1966
3% late · 30 flights
-
WN2429
0% late · 28 flights
-
WN3040
4% late · 27 flights
-
WN383
0% late · 27 flights
-
WN4098
35% late · 26 flights
-
WN4099
40% late · 25 flights
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