Santa Rosa (STS) to Phoenix (PHX): On-Time Performance
Data through May 2026
Santa Rosa (STS) to Phoenix (PHX) effectively runs on two schedules. In September 2024, 97% of arrivals were on time; in July 2025 that fell to 62% — a 34-point seasonal swing. Across the full period the route averages 80% on-time against a national 78%.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 0.2%
- Flights/day
- 1.9
- last 12 months
- Duration
- 2h 7m
- scheduled
- Distance
- 699 mi
Best airline from STS to PHX
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Airmost reliable | 84% | 11 min | 0.3% | 679 |
| American Airlines | 77% | 18 min | 0.0% | 167 |
| SkyWest Airlines | 75% | 26 min | 0.0% | 372 |
Monthly on-time trend
Best time to fly from STS to PHX
Aim for departures around 4 p.m. (83% on-time); avoid 1 p.m. departures (71%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 16 min |
| Tuesday | 86% | 14 min |
| Wednesday | 81% | 11 min |
| Thursday | 80% | 21 min |
| Friday | 75% | 17 min |
| Saturdaybest | 87% | 15 min |
| Sunday | 78% | 20 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft49%
- Airline operations36%
- National airspace system12%
- Weather3%
Frequently asked questions
- How often are flights from STS to PHX delayed?
- 20% of STS–PHX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 16 minutes.
- Which airline is most reliable from STS to PHX?
- Envoy Air has the best on-time record on this route at 84%, based on 679 flights. 3 airlines flew STS–PHX frequently enough to compare in this period.
- What is the best time of day to fly from STS to PHX?
- Departures around 4 p.m. have the best record (83% on-time), while departures around 1 p.m. have the worst (71%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STS to PHX?
- The scheduled STS–PHX flight time averages 2h 7m over 699 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are STS to PHX flights cancelled?
- 0.2% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from STS to PHX?
- July 2025 was the roughest month in this dataset, with only 62% of arrivals on time. The best was September 2024 at 97%. If your dates are flexible, that 34-point gap is worth planning around.
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Based on 1,218 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.