Best Time to Fly SFO to ASE: On-Time Stats by Hour & Airline
San Francisco International → Aspen Pitkin County Sardy Field
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 69.1% of San Francisco (SFO) to Aspen (ASE) flights arrived on time (378 scheduled flights). That is 8.5 points below the national average of 77.6%.
SkyWest Airlines was the only reporting airline with regular flights on this route.
March has been the best month (77% on time) and Friday the weakest day of the week (60%).
2.4% of flights were cancelled, versus 1.8% nationally.
SFO to ASE 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 | 69.1% | 131 min | 2.4% | 378 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SFO to ASE
On-time arrival % by scheduled departure hour (local time), 746 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 80.7% | 0.0% | 66 |
| 8am–9am | 52.1% | 2.4% | 125 |
| 9am–10am | 64.1% | 4.0% | 101 |
| 10am–11am | Limited data | 17 | |
| 12pm–1pm | Limited data | 16 | |
| 4pm–5pm | 68.7% | 1.3% | 317 |
| 6pm–7pm | 85.7% | 10.6% | 104 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SFO to ASE
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) | 38.6% | -35.3 pts | 1.7% | 60 |
| Summer peak (Jun 15 - Aug 15) | 62.4% | -11.5 pts | 0.7% | 146 |
| All other days | 73.9% | — | 3.7% | 540 |
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).