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Flight Reliability

UA 5770 · United Airlines

Aspen → Denver (ASE–DEN)92% of its flights flew this route. The rest (SLC–SFO, SFO–SEA) are included in these numbers.

70
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
10 min
Average arrival delay
3.5%
Cancelled
3 min early
Median arrival delay

Based on 287 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

UA 5770 departing between 6–9 AM arrived on time 90% of the time, versus 73% between 9 AM–12 PM.

Sunday scaries are real for this one.

UA 5770 arrived on time 86% of the time on Saturdays and just 71% on Sundays. That gap is worth planning around.

Keep a backup plan handy.

UA 5770 was cancelled 3.5% of the time. Typical for U.S. flights is around 1–2%.

Slipping a little lately.

UA 5770 arrived on time 72% of the time over the last three months in the data, compared with 77% in the three months before that.

The breakdown

On-time by weekday
  • Mon80%(40 flights)
  • Tue74%(38 flights)
  • Wed83%(40 flights)
  • Thu71%(42 flights)
  • Fri75%(40 flights)
  • Sat86%(35 flights)
  • Sun71%(41 flights)
On-time by departure window
  • 6–9 AM90%(71 flights)
  • 9 AM–12 PM73%(202 flights)
  • 9 PM–12 AM—(3 flights)
On-time trend by month
40%
May

Jun 69% → May 40% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%29
July 202577%31
August 202583%18
November 202593%30
December 202566%29
January 202686%29
February 202680%25
March 202689%28
April 202687%23
May 202640%25
Departures on time
79%
Diverted
0.3%
Flights flown
276
Months covered
12

Same route, other flights

Keep nerding

Based on 287 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.