Route
ONT → STS
Ontario International Airport Charles M. Schulz Sonoma County Airport
423 miles
Return route STS → ONT →
Alerts at ONT and STS
How punctual is this route?
- On-time arrivals
- 91.3%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 73 min
- Flights arriving 15+ minutes late
- Flights tracked
- 139
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 58%
- Airline (crew, maintenance, cleaning) 25%
- Air traffic control & airport 11%
- Extreme weather 5%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Mar 2026
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| March 2026 | 85.7% | 14 |
| April 2026 | 93.3% | 30 |
| May 2026 | 91.7% | 12 |
| June 2026 | 81.0% | 21 |
| July 2026 | 93.5% | 31 |
| August 2026 | 96.7% | 31 |
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 |
|---|---|---|---|---|
| SkyWest Airlines | 139 | 91.3% | 0.0% | 73 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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