Santa Rosa (STS) to San Diego (SAN): On-Time Performance
Data through July 2026
The calendar drives reliability on STS–SAN. July 2025 flights landed on schedule 85% of the time, but November 2024 dropped to 47% — a gap of 38 points. Across the full period the route averages 72% on-time against a national 78%. Morning departures also hold up better than evening ones (82% vs 57%), which matters most in the rough months.
- On-time
- 72%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 2.5%
- Flights/day
- 2.8
- last 12 months
- Duration
- 1h 43m
- scheduled
- Distance
- 508 mi
Best airline from STS to SAN
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 76% | 18 min | 0.6% | 181 |
| SkyWest Airlines | 72% | 17 min | 2.8% | 1,631 |
Monthly on-time trend
Best time to fly from STS to SAN
Aim for departures around 7 a.m. (90% on-time); avoid 5 p.m. departures (41%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 69% | 18 min |
| Tuesday | 79% | 12 min |
| Wednesdaybest | 81% | 11 min |
| Thursday | 69% | 19 min |
| Friday | 64% | 24 min |
| Saturday | 79% | 17 min |
| Sunday | 72% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft35%
- Airline operations31%
- National airspace system26%
- Weather8%
Frequently asked questions
- How often are flights from STS to SAN delayed?
- 28% of STS–SAN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 17 minutes.
- Which airline is most reliable from STS to SAN?
- Southwest Airlines has the best on-time record on this route at 76%, based on 181 flights. 2 airlines flew STS–SAN frequently enough to compare in this period.
- What is the best time of day to fly from STS to SAN?
- Departures around 7 a.m. have the best record (90% on-time), while departures around 5 p.m. have the worst (41%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STS to SAN?
- The scheduled STS–SAN flight time averages 1h 43m over 508 miles. Actual arrival times vary — flights on this route land 15+ minutes late 28% of the time.
- How often are STS to SAN flights cancelled?
- 2.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from STS to SAN?
- November 2024 was the roughest month in this dataset, with only 47% of arrivals on time. The best was July 2025 at 85%. If your dates are flexible, that 38-point gap is worth planning around.
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Based on 1,812 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.