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Flight Reliability

UA 4640 · United Airlines

Huntsville → Denver (HSV–DEN)89% of its flights flew this route. The rest (DEN–GUC) are included in these numbers.

96
Nerd Approved
WanderNerd Reliability Score
89%
Arrive within 15 minutes
3 min early
Average arrival delay
0.2%
Cancelled
11 min early
Median arrival delay

Based on 408 historical flights. Data through May 2026.

What the data says

Skip Tuesday if you can.

UA 4640 arrived on time 95% of the time on Fridays. On Tuesdays: 83%.

A bit ahead of the HSV–DEN route.

UA 4640 arrived on time 89% of the time, versus 84% across the HSV–DEN route.

Better than the United Airlines network average.

UA 4640 arrived on time 89% of the time, versus 79% across the United Airlines network.

It basically never cancels.

Out of 408 scheduled flights, only 0.2% were cancelled.

The breakdown

On-time by weekday
  • Mon88%(57 flights)
  • Tue83%(57 flights)
  • Wed88%(57 flights)
  • Thu90%(58 flights)
  • Fri95%(59 flights)
  • Sat92%(59 flights)
  • Sun88%(60 flights)
On-time by departure window
  • 6–9 AM89%(365 flights)
  • 12–3 PM91%(42 flights)
On-time trend by month
93%
May

Jun 93% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202584%31
August 202584%31
September 202590%30
October 202597%31
November 202590%30
December 202581%31
January 202690%31
February 202689%28
March 202684%57
April 202694%35
May 202693%42
Departures on time
89%
Diverted
0%
Flights flown
407
Months covered
12

Same route, other flights

Keep nerding

Based on 408 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.