Route
SFO → ONT
San Francisco International Airport Ontario International Airport
Alerts at SFO and ONT
How punctual is this route?
- On-time arrivals
- 76.5%
- Less than 15 minutes late
- Cancelled
- 0.8%
- Of scheduled flights
- Average delay when late
- 64 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,337
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 57%
- Airline (crew, maintenance, cleaning) 24%
- Air traffic control & airport 17%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 76.9% | 108 |
| October 2025 | 73.7% | 114 |
| November 2025 | 68.0% | 105 |
| December 2025 | 73.5% | 104 |
| January 2026 | 82.2% | 93 |
| February 2026 | 77.2% | 79 |
| March 2026 | 90.3% | 104 |
| April 2026 | 83.1% | 124 |
| May 2026 | 78.4% | 127 |
| June 2026 | 71.4% | 120 |
| July 2026 | 68.3% | 123 |
| August 2026 | 76.5% | 136 |
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 | 987 | 81.0% | 0.3% | 55 min |
| Frontier Airlines | 211 | 59.7% | 2.4% | 80 min |
| SkyWest Airlines | 139 | 69.1% | 2.2% | 70 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA552
20% late · 216 flights
-
F92678
40% late · 211 flights
-
UA2661
23% late · 195 flights
-
OO5613
35% late · 85 flights
-
UA1561
11% late · 76 flights
-
UA1697
16% late · 55 flights
-
UA1772
13% late · 55 flights
-
UA765
10% late · 49 flights
-
UA448
38% late · 47 flights
-
UA796
39% late · 36 flights
-
UA216
12% late · 34 flights
-
UA2692
38% late · 34 flights
-
UA373
7% late · 29 flights
-
UA487
8% late · 25 flights
-
UA1503
8% late · 24 flights
-
UA210
0% late · 24 flights
-
OO5740
29% late · 21 flights
-
UA1316
10% late · 21 flights
-
UA2478
14% late · 21 flights
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