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Flight Reliability

UA 4650 · United Airlines

Denver → Colorado Springs (DEN–COS)89% of its flights flew this route. The rest (FAT–LAX, DEN–SLC) are included in these numbers.

64
A Little Dicey
WanderNerd Reliability Score
71%
Arrive within 15 minutes
20 min
Average arrival delay
2.2%
Cancelled
2 min early
Median arrival delay

Based on 360 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 4650 departing between 6–9 AM arrived on time 88% of the time, versus 52% between 6–9 PM.

Sunday scaries are real for this one.

UA 4650 arrived on time 84% of the time on Wednesdays and just 62% on Sundays. That gap is worth planning around.

A bit behind the DEN–COS route.

UA 4650 arrived on time 71% of the time, versus 76% across the DEN–COS route.

Lagging the United Airlines network.

UA 4650 arrived on time 71% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon65%(51 flights)
  • Tue76%(46 flights)
  • Wed84%(51 flights)
  • Thu76%(50 flights)
  • Fri65%(48 flights)
  • Sat67%(52 flights)
  • Sun62%(53 flights)
On-time by departure window
  • 6–9 AM88%(34 flights)
  • 3–6 PM—(2 flights)
  • 6–9 PM52%(138 flights)
  • 9 PM–12 AM82%(177 flights)
On-time trend by month
74%
May

Jun 38% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202538%29
July 202547%30
August 202540%30
September 202562%26
October 202577%31
November 202593%27
December 202583%29
January 202683%30
February 202686%28
March 202687%30
April 202680%30
May 202674%31
Departures on time
67%
Diverted
0.3%
Flights flown
351
Months covered
12

Same route, other flights

Keep nerding

Based on 360 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.