SAN to STS flight delays & on-time performance
Nonstop flights from San Diego International Airport to Charles M. Schulz Sonoma County Airport · 508 miles · Aug 2025 – Jul 2026
- SAN: Airport closed. Closed, expected to reopen Oct 11 at 13:00 UTC.
On-time arrivals
78%
arrived < 15 min late
Cancelled
3.5%
35 flights
Avg arrival delay
11 min
48 min when late
Airlines
2
1,014 flights tracked
Key facts
- Flights from San Diego (SAN) to Santa Rosa (STS) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 3.5% were cancelled, and 6% arrived an hour or more late.
- SkyWest Airlines was the most punctual airline here (80% on time); Southwest Airlines was the least (70%).
- Departures scheduled around 5pm did best (89% on time); around 8pm did worst (60%).
- Wednesday was the most reliable day to fly (87% on time) and Friday the least (67%).
- The largest source of delay minutes was late-arriving aircraft (51%).
Which airline is most on time from SAN to STS?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 80% | 3.8% | 10 min | 5.3% | 832 |
| Southwest Airlines | 70% | 1.6% | 15 min | 7.9% | 182 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am88%80 flights
- 8am87%173 flights
- 9am83%92 flights
- 12pm73%171 flights
- 2pm65%26 flights
- 5pm89%58 flights
- 8pm60%50 flights
- 9pm75%342 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday79%3.7% cancelled
- Tuesday83%3.3% cancelled
- Wednesday87%2.4% cancelled
- Thursday83%4.4% cancelled
- Friday67%4.8% cancelled
- Saturday81%3.3% cancelled
- Sunday71%1.9% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft51%
- Air traffic control & airport congestion26%
- Airline (crew, maintenance, cleaning, fueling)20%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather51%
- Air traffic control & airport congestion37%
- Airline (crew, maintenance, cleaning, fueling)11%
- Security0%
SAN to STS: common questions
- How often are SAN to STS flights on time?
- 78% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from San Diego to Santa Rosa cancelled?
- 3.5% of scheduled flights were cancelled (35 of 1,014).
- How long are typical delays?
- Across all flights the average arrival delay was 11 min (early arrivals count as zero). Flights that were late arrived 48 min behind schedule on average, and 5.8% of flights were an hour or more late.
- How long is taxi time at SAN?
- Flights on this route spent 22 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STS to SAN — 75% on time
More flights from San Diego
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SAN → STS, nonstop flights by US airlines that report to the DOT. How we calculate this.