STS to SAN flight delays & on-time performance
Nonstop flights from Charles M. Schulz Sonoma County Airport to San Diego International Airport · 508 miles · Aug 2025 – Jul 2026
- SAN: Airport closed. Closed, expected to reopen Oct 11 at 13:00 UTC.
On-time arrivals
75%
arrived < 15 min late
Cancelled
3.0%
30 flights
Avg arrival delay
17 min
61 min when late
Airlines
2
1,009 flights tracked
Key facts
- Flights from Santa Rosa (STS) to San Diego (SAN) arrived on time 75% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 3% were cancelled, and 7% arrived an hour or more late.
- Southwest Airlines was the most punctual airline here (76% on time); SkyWest Airlines was the least (75%).
- Departures scheduled around 7am did best (90% on time); around 5pm did worst (41%).
- Wednesday was the most reliable day to fly (88% on time) and Friday the least (67%).
- The largest source of delay minutes was late-arriving aircraft (36%).
Which airline is most on time from STS to SAN?
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 |
|---|---|---|---|---|---|
| Southwest Airlines | 76% | 0.6% | 18 min | 7.2% | 181 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 75% | 3.5% | 16 min | 7.5% | 828 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am89%310 flights
- 7am90%83 flights
- 9am80%60 flights
- 10am72%69 flights
- 11am61%45 flights
- 2pm69%67 flights
- 3pm77%60 flights
- 4pm64%44 flights
- 5pm41%37 flights
- 6pm72%56 flights
- 7pm60%166 flights
- 8pm50%12 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday71%0.6% cancelled
- Tuesday85%5.8% cancelled
- Wednesday88%3.2% cancelled
- Thursday68%1.9% cancelled
- Friday67%3.6% cancelled
- Saturday81%3.4% cancelled
- Sunday73%3.2% 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 aircraft36%
- Airline (crew, maintenance, cleaning, fueling)33%
- Air traffic control & airport congestion26%
- Extreme weather5%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather57%
- Air traffic control & airport congestion33%
- Airline (crew, maintenance, cleaning, fueling)10%
- Security0%
STS to SAN: common questions
- How often are STS to SAN flights on time?
- 75% 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 Santa Rosa to San Diego cancelled?
- 3.0% of scheduled flights were cancelled (30 of 1,009).
- How long are typical delays?
- Across all flights the average arrival delay was 17 min (early arrivals count as zero). Flights that were late arrived 61 min behind schedule on average, and 7.5% of flights were an hour or more late.
- How long is taxi time at STS?
- Flights on this route spent 20 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SAN to STS — 78% on time
More flights from Santa Rosa
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: STS → SAN, nonstop flights by US airlines that report to the DOT. How we calculate this.