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Flight Reliability

UA 5523 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5523 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

77%
Arrive within 15 minutes
14 min
Average arrival delay
2.7%
Cancelled
4 min early
Median arrival delay

Based on 339 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(48 flights)
  • Tue81%(42 flights)
  • Wed81%(42 flights)
  • Thu78%(51 flights)
  • Fri73%(51 flights)
  • Sat84%(44 flights)
  • Sun74%(50 flights)
On-time by departure window
  • 9 AM–12 PM68%(85 flights)
  • 12–3 PM81%(95 flights)
  • 3–6 PM65%(46 flights)
  • 6–9 PM76%(21 flights)
  • 9 PM–12 AM88%(81 flights)
On-time trend by month
87%
May

Jun 57% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%30
July 202567%30
August 202565%23
September 202580%30
October 202583%29
November 202577%22
December 202557%23
January 202697%31
February 202678%23
March 202673%26
April 202693%30
May 202687%31
Departures on time
81%
Diverted
0.6%
Flights flown
328
Months covered
12

Keep nerding

Based on 339 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.