Route
ONT → OAK
Ontario International Airport Oakland San Francisco Bay Airport
Alerts at ONT and OAK
How punctual is this route?
- On-time arrivals
- 86.0%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,450
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 71%
- Airline (crew, maintenance, cleaning) 26%
- Air traffic control & airport 3%
- Security 0%
- Extreme weather 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.0% | 133 |
| October 2025 | 81.6% | 136 |
| November 2025 | 84.1% | 129 |
| December 2025 | 79.3% | 121 |
| January 2026 | 90.7% | 120 |
| February 2026 | 90.4% | 115 |
| March 2026 | 96.7% | 121 |
| April 2026 | 85.3% | 116 |
| May 2026 | 80.5% | 118 |
| June 2026 | 75.7% | 111 |
| July 2026 | 91.4% | 116 |
| August 2026 | 84.8% | 114 |
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 | 1,450 | 86.0% | 0.6% | 63 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3155
20% late · 60 flights
-
WN1003
5% late · 58 flights
-
WN2424
10% late · 58 flights
-
WN3662
26% late · 58 flights
-
WN3659
11% late · 57 flights
-
WN3985
16% late · 56 flights
-
WN3082
25% late · 51 flights
-
WN4331
2% late · 50 flights
-
WN1992
2% late · 47 flights
-
WN2572
11% late · 44 flights
-
WN3154
9% late · 43 flights
-
WN117
2% late · 42 flights
-
WN2011
27% late · 42 flights
-
WN2757
17% late · 42 flights
-
WN3661
26% late · 42 flights
-
WN3986
36% late · 35 flights
-
WN4135
0% late · 33 flights
-
WN4136
3% late · 33 flights
-
WN3868
10% late · 31 flights
-
WN4012
23% late · 31 flights
-
WN2563
0% late · 30 flights
-
WN2261
4% late · 28 flights
-
WN2986
7% late · 27 flights
-
WN658
7% late · 27 flights
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