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Flight Reliability

UA 2166 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 2166 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

81%
Arrive within 15 minutes
5 min
Average arrival delay
1.3%
Cancelled
7 min early
Median arrival delay

Based on 459 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(68 flights)
  • Tue87%(61 flights)
  • Wed77%(68 flights)
  • Thu91%(67 flights)
  • Fri75%(69 flights)
  • Sat79%(52 flights)
  • Sun80%(66 flights)
On-time by departure window
  • 3–6 AM94%(18 flights)
  • 6–9 AM94%(63 flights)
  • 9 AM–12 PM84%(118 flights)
  • 12–3 PM81%(72 flights)
  • 3–6 PM73%(148 flights)
  • 6–9 PM80%(30 flights)
  • 9 PM–12 AM—(2 flights)
On-time trend by month
74%
May

Jun 90% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%52
July 202577%31
August 202567%42
September 202578%36
October 202580%56
November 202584%19
December 202568%31
January 202692%26
February 202685%59
March 202682%38
April 2026100%30
May 202674%31
Departures on time
83%
Diverted
0.4%
Flights flown
451
Months covered
12

Keep nerding

Based on 459 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.