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Flight Reliability

UA 4660 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4660 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

73%
Arrive within 15 minutes
20 min
Average arrival delay
1.9%
Cancelled
8 min early
Median arrival delay

Based on 362 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(49 flights)
  • Tue69%(51 flights)
  • Wed75%(51 flights)
  • Thu74%(49 flights)
  • Fri71%(51 flights)
  • Sat68%(50 flights)
  • Sun76%(53 flights)
On-time by departure window
  • 6–9 AM94%(145 flights)
  • 3–6 PM—(4 flights)
  • 6–9 PM57%(196 flights)
  • 9 PM–12 AM—(9 flights)
On-time trend by month
97%
May

Jun 45% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202545%29
July 202535%26
August 202532%31
September 202559%29
October 202577%31
November 202589%28
December 202565%31
January 202697%30
February 202696%28
March 202690%30
April 202690%30
May 202697%31
Departures on time
73%
Diverted
0.3%
Flights flown
354
Months covered
12

Keep nerding

Based on 362 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.