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Flight Reliability

UA 5771 · United Airlines

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

50
A Little Dicey
WanderNerd Reliability Score
72%
Arrive within 15 minutes
13 min
Average arrival delay
5.8%
Cancelled
5 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

UA 5771 departing between 6–9 AM arrived on time 81% of the time, versus 72% between 12–3 PM.

Saturdays have been rough.

UA 5771 arrived on time 81% of the time on Wednesdays and just 64% on Saturdays. That gap is worth planning around.

A bit behind the United Airlines network.

UA 5771 arrived on time 72% of the time, versus 79% across the United Airlines network.

Keep a backup plan handy.

UA 5771 was cancelled 5.8% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon77%(52 flights)
  • Tue75%(47 flights)
  • Wed81%(47 flights)
  • Thu69%(49 flights)
  • Fri75%(48 flights)
  • Sat64%(47 flights)
  • Sun66%(47 flights)
On-time by departure window
  • 6–9 AM81%(21 flights)
  • 12–3 PM72%(309 flights)
  • 6–9 PM—(7 flights)
On-time trend by month
83%
May

Jun 44% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202544%25
July 202577%26
August 202568%28
September 202577%30
October 202583%29
November 202590%29
December 202562%29
January 202682%27
February 202652%27
March 202670%27
April 202677%30
May 202683%30
Departures on time
74%
Diverted
1.4%
Flights flown
337
Months covered
12

Same route, other flights

Keep nerding

Based on 363 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.