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Route Reliability

San Francisco → Aspen

SFO–ASE · 848 miles · San Francisco International Airport to Aspen/Pitkin County Airport

41
Bring Snacks
WanderNerd Reliability Score
74%
Arrive within 15 minutes
35 min
Average arrival delay
2.6%
Cancelled
380
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 74% of the time across 380 flights. No comparison to make.

What the data says

The late departure is the smart one here.

SFO–ASE flights departing between 6–9 PM arrived on time 88% of the time, versus 67% between 6–9 AM.

Friday is doing you no favors.

SFO–ASE flights arrived on time 85% of the time on Wednesdays and just 65% on Fridays. That gap is worth planning around.

Slipping a little lately.

SFO–ASE flights arrived on time 68% of the time over the last three months in the data, compared with 74% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon76%(50 flights)
  • Tue80%(44 flights)
  • Wed85%(48 flights)
  • Thu71%(48 flights)
  • Fri65%(46 flights)
  • Sat72%(58 flights)
  • Sun70%(59 flights)
On-time by departure window
  • 6–9 AM67%(48 flights)
  • 9 AM–12 PM71%(88 flights)
  • 12–3 PM—(5 flights)
  • 3–6 PM74%(170 flights)
  • 6–9 PM88%(42 flights)
On-time trend by month
55%
May

Jun 87% → May 55% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202568%38
August 202570%37
September 202596%23
December 202544%27
January 202681%58
February 202665%62
March 202685%58
May 202655%11

Keep nerding

Based on 380 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.