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Route Reliability

Aspen → San Francisco

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

46
Bring Snacks
WanderNerd Reliability Score
70%
Arrive within 15 minutes
22 min
Average arrival delay
6.1%
Cancelled
376
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 70% of the time across 376 flights. No comparison to make.

What the data says

The 3–6 PM departure wins.

ASE–SFO flights departing between 3–6 PM arrived on time 74% of the time, versus 60% between 6–9 PM.

Sunday scaries are real for this one.

ASE–SFO flights arrived on time 84% of the time on Tuesdays and just 62% on Sundays. That gap is worth planning around.

Keep a backup plan handy.

This route was cancelled 6.1% of the time. Typical for U.S. flights is around 1–2%.

Recent months have been rougher.

ASE–SFO flights arrived on time 63% of the time over the last three months in the data, compared with 73% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon65%(48 flights)
  • Tue84%(44 flights)
  • Wed83%(47 flights)
  • Thu67%(51 flights)
  • Fri63%(46 flights)
  • Sat67%(58 flights)
  • Sun62%(58 flights)
On-time by departure window
  • 6–9 AM74%(114 flights)
  • 9 AM–12 PM73%(63 flights)
  • 12–3 PM66%(64 flights)
  • 3–6 PM74%(43 flights)
  • 6–9 PM60%(68 flights)
On-time trend by month
50%
May

Jun 68% → May 50% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%31
July 202562%37
August 202576%37
September 202592%24
December 202548%27
January 202679%56
February 202659%64
March 202681%57
May 202650%10

Keep nerding

Based on 376 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.