Best Time to Fly ASE to SFO: On-Time Stats by Hour & Airline
Aspen Pitkin County Sardy Field → San Francisco International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 61.8% of Aspen (ASE) to San Francisco (SFO) flights arrived on time (376 scheduled flights). That is 15.9 points below the national average of 77.6%.
SkyWest Airlines was the only reporting airline with regular flights on this route.
January has been the best month (78% on time) and Sunday the weakest day of the week (56%).
5.6% of flights were cancelled, versus 1.8% nationally.
ASE to SFO 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 |
|---|---|---|---|---|
| SkyWest Airlines | 61.8% | 98 min | 5.6% | 376 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ASE to SFO
On-time arrival % by scheduled departure hour (local time), 742 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 73.5% | 0.7% | 149 |
| 9am–10am | 50.5% | 1.9% | 108 |
| 10am–11am | 45.7% | 5.4% | 37 |
| 12pm–1pm | 78.6% | 6.7% | 90 |
| 1pm–2pm | 65.3% | 9.3% | 54 |
| 2pm–3pm | Limited data | 16 | |
| 3pm–4pm | Limited data | 33 | |
| 4pm–5pm | 72.9% | 10.9% | 55 |
| 5pm–6pm | Limited data | 1 | |
| 6pm–7pm | 61.8% | 15.0% | 80 |
| 7pm–8pm | 59.8% | 5.9% | 119 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ASE to SFO
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Christmas & New Year (Dec 20 - Jan 3) | 43.6% | -27.7 pts | 8.3% | 60 |
| Summer peak (Jun 15 - Aug 15) | 51.0% | -20.3 pts | 1.4% | 147 |
| All other days | 71.3% | — | 7.8% | 535 |
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).