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Flight Reliability

UA 1666 · United Airlines

Cincinnati → Denver (CVG–DEN)91% of its flights flew this route. The rest (DEN–CLT, XNA–DEN) are included in these numbers.

92
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
1 min
Average arrival delay
0.8%
Cancelled
10 min early
Median arrival delay

Based on 398 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

UA 1666 departing between 6–9 AM arrived on time 92% of the time, versus 84% between 9 AM–12 PM.

Friday is doing you no favors.

UA 1666 arrived on time 97% of the time on Sundays and just 79% on Fridays. That gap is worth planning around.

A bit ahead of the CVG–DEN route.

UA 1666 arrived on time 87% of the time, versus 82% across the CVG–DEN route.

Better than the United Airlines network average.

UA 1666 arrived on time 87% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon86%(58 flights)
  • Tue88%(56 flights)
  • Wed90%(57 flights)
  • Thu86%(56 flights)
  • Fri79%(56 flights)
  • Sat87%(55 flights)
  • Sun97%(57 flights)
On-time by departure window
  • 6–9 AM92%(158 flights)
  • 9 AM–12 PM84%(236 flights)
  • 3–6 PM—(1 flights)
On-time trend by month
87%
May

Jun 90% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202594%31
August 202584%31
September 202593%30
October 202589%37
November 202593%56
December 202578%32
January 202683%30
February 202675%28
March 202681%31
April 202697%29
May 202687%30
Departures on time
89%
Diverted
0%
Flights flown
395
Months covered
12

Same route, other flights

Keep nerding

Based on 398 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.