Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 4720 · United Airlines

Salt Lake City → Denver (SLC–DEN)85% of its flights flew this route. The rest (ORD–COS, ASE–DEN) are included in these numbers.

89
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
5 min
Average arrival delay
0.6%
Cancelled
12 min early
Median arrival delay

Based on 336 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 4720 departing between 6–9 AM arrived on time 86% of the time, versus 36% between 3–6 PM.

Friday is doing you no favors.

UA 4720 arrived on time 91% of the time on Wednesdays and just 74% on Fridays. That gap is worth planning around.

Better than the SLC–DEN route average.

UA 4720 arrived on time 85% of the time, versus 77% across the SLC–DEN route.

A bit ahead of the United Airlines network.

UA 4720 arrived on time 85% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon85%(47 flights)
  • Tue84%(45 flights)
  • Wed91%(46 flights)
  • Thu87%(46 flights)
  • Fri74%(50 flights)
  • Sat86%(51 flights)
  • Sun85%(48 flights)
On-time by departure window
  • 6–9 AM86%(22 flights)
  • 12–3 PM86%(300 flights)
  • 3–6 PM36%(11 flights)
On-time trend by month
100%
May

Jun 83% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%29
July 202590%31
August 202597%31
September 202590%30
October 202594%31
November 202596%28
December 202568%31
January 202623%13
February 202679%19
March 202672%29
April 202687%30
May 2026100%31
Departures on time
86%
Diverted
0.3%
Flights flown
333
Months covered
12

Same route, other flights

Keep nerding

Based on 336 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.