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Flight Reliability

UA 531 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 531 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

74%
Arrive within 15 minutes
13 min
Average arrival delay
0.4%
Cancelled
2 min early
Median arrival delay

Based on 561 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(85 flights)
  • Tue73%(63 flights)
  • Wed78%(83 flights)
  • Thu78%(85 flights)
  • Fri63%(87 flights)
  • Sat79%(67 flights)
  • Sun75%(89 flights)
On-time by departure window
  • 9 AM–12 PM—(1 flights)
  • 3–6 PM70%(192 flights)
  • 6–9 PM75%(139 flights)
  • 9 PM–12 AM77%(227 flights)
On-time trend by month
73%
May

Jun 54% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202554%35
July 202565%62
August 202545%56
September 202581%47
October 202588%34
November 202587%47
December 202581%31
January 202687%30
February 202673%45
March 202686%57
April 202682%56
May 202673%59
Departures on time
76%
Diverted
0%
Flights flown
559
Months covered
12

Keep nerding

Based on 561 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.