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Flight Reliability

UA 478 · United Airlines

BIL → Denver (BIL–DEN)91% of its flights flew this route. The rest (DEN–LAS, ORD–MSN) are included in these numbers.

77
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
9 min
Average arrival delay
0%
Cancelled
8 min early
Median arrival delay

Based on 401 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 478 departing between 3–6 PM arrived on time 86% of the time, versus 74% between 12–3 PM.

Monday is the weak spot.

UA 478 arrived on time 83% of the time on Sundays. On Mondays: 68%.

A bit behind the BIL–DEN route.

UA 478 arrived on time 75% of the time, versus 81% across the BIL–DEN route.

A bit behind the United Airlines network.

UA 478 arrived on time 75% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon68%(57 flights)
  • Tue71%(56 flights)
  • Wed74%(57 flights)
  • Thu71%(55 flights)
  • Fri75%(56 flights)
  • Sat80%(56 flights)
  • Sun83%(58 flights)
On-time by departure window
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM74%(358 flights)
  • 3–6 PM86%(36 flights)
On-time trend by month
84%
May

Jun 45% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202545%29
July 202556%27
August 202539%31
September 202560%30
October 202576%37
November 202588%59
December 202588%32
January 202690%30
February 202682%28
March 202677%31
April 202697%30
May 202684%31
Departures on time
79%
Diverted
1.5%
Flights flown
395
Months covered
12

Same route, other flights

Keep nerding

Based on 401 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.