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Flight Reliability

UA 4666 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4666 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

82%
Arrive within 15 minutes
3 min
Average arrival delay
1.4%
Cancelled
5 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(52 flights)
  • Tue90%(51 flights)
  • Wed86%(51 flights)
  • Thu78%(51 flights)
  • Fri75%(51 flights)
  • Sat84%(51 flights)
  • Sun80%(51 flights)
On-time by departure window
  • 6–9 AM89%(79 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM78%(101 flights)
  • 6–9 PM82%(152 flights)
  • 9 PM–12 AM80%(25 flights)
On-time trend by month
67%
May

Jun 83% → May 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202590%31
August 202581%31
September 202580%30
October 202583%30
November 202579%28
December 202583%30
January 202684%31
February 202693%28
March 202690%29
April 202673%30
May 202667%30
Departures on time
84%
Diverted
0.5%
Flights flown
358
Months covered
12

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.