Best Time to Fly STS to PHX: On-Time Stats by Hour & Airline
Charles M. Schulz - Sonoma County → Phoenix Sky Harbor International
Data through July 2026 · Last updated October 18, 2026
693 flights were scheduled from Santa Rosa (STS) to Phoenix (PHX) in the last 12 months, and 76.9% of those that flew arrived on time, 0.7 points below the US average of 77.6%.
Envoy Air was the most punctual of the 2 airlines on the route at 79.9%, while SkyWest Airlines trailed at 71.5%.
August has been the best month (89% on time) and Monday the weakest day of the week (73%).
0.4% of flights were cancelled, versus 1.8% nationally.
STS to PHX 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 |
|---|---|---|---|---|
| Envoy Air | 79.9% | 54 min | 0.5% | 426 |
| SkyWest Airlines | 71.5% | 78 min | 0.4% | 261 |
| American Airlines | Limited data | 6 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STS to PHX
On-time arrival % by scheduled departure hour (local time), 1,278 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 1 | |
| 10am–11am | Limited data | 1 | |
| 12pm–1pm | 79.5% | 0.0% | 438 |
| 1pm–2pm | 62.8% | 0.5% | 189 |
| 2pm–3pm | Limited data | 1 | |
| 4pm–5pm | 82.0% | 0.3% | 648 |
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 PHX
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) | Limited data | 25 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 75.0% | -5.5 pts | 0.0% | 48 |
| Summer peak (Jun 15 - Aug 15) | 67.8% | -12.7 pts | 0.4% | 231 |
| All other days | 80.5% | — | 0.2% | 974 |
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).