Route
SJC → ONT
Mineta San Jose International Airport Ontario International Airport
How punctual is this route?
- On-time arrivals
- 82.4%
- Less than 15 minutes late
- Cancelled
- 0.2%
- Of scheduled flights
- Average delay when late
- 51 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,318
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 75%
- Airline (crew, maintenance, cleaning) 22%
- Air traffic control & airport 3%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 84.9% | 107 |
| October 2025 | 71.8% | 110 |
| November 2025 | 87.9% | 116 |
| December 2025 | 84.7% | 118 |
| January 2026 | 90.1% | 101 |
| February 2026 | 88.9% | 99 |
| March 2026 | 87.9% | 107 |
| April 2026 | 85.8% | 106 |
| May 2026 | 83.6% | 110 |
| June 2026 | 71.7% | 114 |
| July 2026 | 70.3% | 119 |
| August 2026 | 82.9% | 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 | 1,318 | 82.4% | 0.2% | 51 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN4879
2% late · 61 flights
-
WN3151
14% late · 60 flights
-
WN3983
22% late · 60 flights
-
WN4253
7% late · 58 flights
-
WN4255
19% late · 58 flights
-
WN704
3% late · 58 flights
-
WN1173
6% late · 50 flights
-
WN1642
4% late · 47 flights
-
WN814
20% late · 46 flights
-
WN3692
53% late · 45 flights
-
WN4103
0% late · 44 flights
-
WN653
0% late · 42 flights
-
WN3166
21% late · 33 flights
-
WN4132
3% late · 33 flights
-
WN757
13% late · 31 flights
-
WN1786
27% late · 30 flights
-
WN1827
27% late · 30 flights
-
WN2615
33% late · 30 flights
-
WN1522
39% late · 28 flights
-
WN4138
7% late · 28 flights
-
WN2767
19% late · 27 flights
-
WN3691
48% late · 27 flights
-
WN1629
4% late · 26 flights
-
WN1315
26% late · 23 flights
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