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Flight Reliability

UA 5634 · United Airlines

Colorado Springs → Denver (COS–DEN)

87
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
6 min
Average arrival delay
0.6%
Cancelled
5 min early
Median arrival delay

Based on 348 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 82% of the time, against 76% between 6–9 AM.

Thursdays have been rough.

UA 5634 arrived on time 90% of the time on Wednesdays and just 71% on Thursdays. That gap is worth planning around.

A bit ahead of the COS–DEN route.

UA 5634 arrived on time 82% of the time, versus 78% across the COS–DEN route.

Slipping a little lately.

UA 5634 arrived on time 82% of the time over the last three months in the data, compared with 86% in the three months before that.

The breakdown

On-time by weekday
  • Mon82%(50 flights)
  • Tue84%(49 flights)
  • Wed90%(48 flights)
  • Thu71%(49 flights)
  • Fri78%(50 flights)
  • Sat84%(49 flights)
  • Sun82%(51 flights)
On-time by departure window
  • 6–9 AM76%(25 flights)
  • 9 AM–12 PM82%(321 flights)
On-time trend by month
87%
May

Jun 67% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%30
July 202577%30
August 202577%31
September 202593%30
October 202571%31
November 202593%29
December 202587%15
January 202677%31
February 202693%28
March 202677%31
April 202683%30
May 202687%30
Departures on time
83%
Diverted
0%
Flights flown
346
Months covered
12

Same route, other flights

Keep nerding

Based on 348 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.