Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 5221 · United Airlines

AMA → Denver (AMA–DEN)

87
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
6 min
Average arrival delay
1.1%
Cancelled
16 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Skip Saturday if you can.

UA 5221 arrived on time 90% of the time on Tuesdays. On Saturdays: 76%.

Better than the AMA–DEN route average.

UA 5221 arrived on time 84% of the time, versus 75% across the AMA–DEN route.

A bit ahead of the United Airlines network.

UA 5221 arrived on time 84% of the time, versus 79% across the United Airlines network.

Ticking up lately.

UA 5221 arrived on time 96% of the time over the last three months in the data, compared with 89% in the three months before that.

The breakdown

On-time by weekday
  • Mon84%(51 flights)
  • Tue90%(52 flights)
  • Wed83%(52 flights)
  • Thu81%(52 flights)
  • Fri88%(51 flights)
  • Sat76%(50 flights)
  • Sun89%(52 flights)
On-time trend by month
97%
May

Jun 70% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%30
July 202581%31
August 202571%31
September 202587%30
October 202574%31
November 202580%30
December 202583%30
January 202697%29
February 202686%28
March 202690%29
April 2026100%30
May 202697%31
Departures on time
88%
Diverted
0.3%
Flights flown
360
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.