Route
ONT → SFO
Ontario International Airport San Francisco International Airport
Alerts at ONT and SFO
How punctual is this route?
- On-time arrivals
- 60.7%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 66 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,335
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 64%
- Late-arriving aircraft 21%
- Airline (crew, maintenance, cleaning) 14%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 64.8% | 108 |
| October 2025 | 57.9% | 114 |
| November 2025 | 75.7% | 105 |
| December 2025 | 75.5% | 104 |
| January 2026 | 82.6% | 93 |
| February 2026 | 72.2% | 79 |
| March 2026 | 91.1% | 103 |
| April 2026 | 53.2% | 124 |
| May 2026 | 43.2% | 127 |
| June 2026 | 33.3% | 120 |
| July 2026 | 44.3% | 123 |
| August 2026 | 54.8% | 135 |
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 |
|---|---|---|---|---|
| United Airlines | 985 | 68.3% | 0.4% | 68 min |
| Frontier Airlines | 211 | 37.7% | 1.9% | 66 min |
| SkyWest Airlines | 139 | 40.9% | 1.4% | 59 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA2363
10% late · 232 flights
-
UA1375
46% late · 160 flights
-
F92677
60% late · 153 flights
-
UA1665
49% late · 83 flights
-
OO5624
87% late · 69 flights
-
F91159
68% late · 58 flights
-
UA1470
26% late · 58 flights
-
UA393
71% late · 55 flights
-
UA1708
25% late · 48 flights
-
UA698
40% late · 47 flights
-
UA2012
11% late · 37 flights
-
UA2072
35% late · 36 flights
-
UA1585
45% late · 31 flights
-
UA1840
16% late · 31 flights
-
UA2248
66% late · 29 flights
-
UA2332
17% late · 24 flights
-
UA2647
0% late · 24 flights
-
UA1503
45% late · 20 flights
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