Best Time to Fly STS to SAN: On-Time Stats by Hour & Airline
Charles M. Schulz - Sonoma County → San Diego International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 74.9% of Santa Rosa (STS) to San Diego (SAN) flights arrived on time (1,009 scheduled flights). That is 2.7 points below the national average of 77.6%.
Southwest Airlines was the most punctual of the 2 airlines on the route at 75.6%, while SkyWest Airlines trailed at 74.8%.
August has been the best month (77% on time) and Friday the weakest day of the week (64%).
3.0% of flights were cancelled, versus 1.8% nationally.
STS to SAN on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 75.6% | 69 min | 0.6% | 181 |
| SkyWest Airlines | 74.8% | 60 min | 3.5% | 828 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STS to SAN
On-time arrival % by scheduled departure hour (local time), 1,750 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 85.7% | 5.3% | 646 |
| 7am–8am | 90.2% | 1.2% | 83 |
| 9am–10am | 80.0% | 0.0% | 60 |
| 10am–11am | 68.0% | 0.0% | 97 |
| 11am–12pm | 62.1% | 1.0% | 104 |
| 2pm–3pm | 69.2% | 0.0% | 91 |
| 3pm–4pm | 73.9% | 0.0% | 69 |
| 4pm–5pm | 66.7% | 0.0% | 72 |
| 5pm–6pm | 40.5% | 0.0% | 37 |
| 6pm–7pm | 61.5% | 2.6% | 272 |
| 7pm–8pm | 58.1% | 1.4% | 207 |
| 8pm–9pm | Limited data | 12 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STS to SAN
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 69.7% | -3.0 pts | 13.2% | 38 |
| Christmas & New Year (Dec 20 - Jan 3) | 61.3% | -11.4 pts | 7.2% | 69 |
| Summer peak (Jun 15 - Aug 15) | 75.8% | +3.1 pts | 1.9% | 321 |
| All other days | 72.7% | — | 2.3% | 1,322 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).