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Flight Reliability

UA 4799 · United Airlines

Denver → BIS (DEN–BIS)88% of its flights flew this route. The rest (PSP–DEN, ORD–BOI) are included in these numbers.

67
Usually Fine
WanderNerd Reliability Score
73%
Arrive within 15 minutes
20 min
Average arrival delay
1.6%
Cancelled
6 min early
Median arrival delay

Based on 381 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 4799 departing between 3–6 PM arrived on time 80% of the time, versus 72% between 6–9 PM.

Friday is doing you no favors.

UA 4799 arrived on time 78% of the time on Thursdays. On Fridays: 67%.

A bit behind the DEN–BIS route.

UA 4799 arrived on time 73% of the time, versus 76% across the DEN–BIS route.

A bit behind the United Airlines network.

UA 4799 arrived on time 73% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon77%(57 flights)
  • Tue75%(55 flights)
  • Wed75%(57 flights)
  • Thu78%(51 flights)
  • Fri67%(54 flights)
  • Sat68%(44 flights)
  • Sun69%(55 flights)
On-time by departure window
  • 12–3 PM—(7 flights)
  • 3–6 PM80%(39 flights)
  • 6–9 PM72%(327 flights)
On-time trend by month
79%
May

Jun 26% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202526%27
July 202559%29
August 202547%30
September 202581%26
October 202589%27
November 202589%26
December 202571%31
January 202670%30
February 202682%27
March 202686%36
April 202686%56
May 202679%28
Departures on time
75%
Diverted
0.5%
Flights flown
373
Months covered
12

Same route, other flights

Keep nerding

Based on 381 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.