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Flight Reliability

UA 621 · United Airlines

Albuquerque → Denver (ABQ–DEN)95% of its flights flew this route. The rest (DEN–GSP) are included in these numbers.

94
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
1 min early
Average arrival delay
0.8%
Cancelled
10 min early
Median arrival delay

Based on 385 historical flights. Data through May 2026.

What the data says

Thursday is the weak spot.

UA 621 arrived on time 98% of the time on Fridays. On Thursdays: 85%.

Better than the ABQ–DEN route average.

UA 621 arrived on time 90% of the time, versus 82% across the ABQ–DEN route.

Better than the United Airlines network average.

UA 621 arrived on time 90% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon93%(55 flights)
  • Tue87%(55 flights)
  • Wed86%(55 flights)
  • Thu85%(52 flights)
  • Fri98%(53 flights)
  • Sat87%(55 flights)
  • Sun95%(56 flights)
On-time by departure window
  • 6–9 AM90%(361 flights)
  • 9 AM–12 PM90%(20 flights)
On-time trend by month
92%
May

Jun 90% → May 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%29
July 202580%30
August 202584%31
September 202593%30
October 202584%31
November 202597%30
December 202590%30
January 202687%31
February 202696%28
March 202697%31
April 202690%29
May 202692%51
Departures on time
93%
Diverted
0.3%
Flights flown
381
Months covered
12

Same route, other flights

Keep nerding

Based on 385 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.