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Flight Reliability

UA 4663 · United Airlines

Denver → BIS (DEN–BIS)93% of its flights flew this route. The rest (CRW–ORD, CID–DEN) are included in these numbers.

89
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
2 min
Average arrival delay
0.5%
Cancelled
8 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

UA 4663 departing between 6–9 AM arrived on time 92% of the time, versus 83% between 9 AM–12 PM.

Mondays have been rough.

UA 4663 arrived on time 92% of the time on Fridays and just 69% on Mondays. That gap is worth planning around.

Better than the DEN–BIS route average.

UA 4663 arrived on time 84% of the time, versus 76% across the DEN–BIS route.

A bit ahead of the United Airlines network.

UA 4663 arrived on time 84% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon69%(52 flights)
  • Tue90%(51 flights)
  • Wed90%(52 flights)
  • Thu82%(51 flights)
  • Fri92%(51 flights)
  • Sat87%(52 flights)
  • Sun77%(53 flights)
On-time by departure window
  • 6–9 AM92%(26 flights)
  • 9 AM–12 PM83%(335 flights)
  • 3–6 PM—(1 flights)
On-time trend by month
90%
May

Jun 90% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202577%31
August 202581%31
September 202587%30
October 202574%31
November 202597%29
December 202580%30
January 202687%30
February 202689%28
March 202674%31
April 202683%30
May 202690%31
Departures on time
86%
Diverted
0.3%
Flights flown
362
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.