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Flight Reliability

UA 4531 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4531 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

75%
Arrive within 15 minutes
15 min
Average arrival delay
2.8%
Cancelled
2 min early
Median arrival delay

Based on 247 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon88%(33 flights)
  • Tue75%(32 flights)
  • Wed66%(35 flights)
  • Thu74%(35 flights)
  • Fri61%(33 flights)
  • Sat81%(37 flights)
  • Sun77%(34 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 9 AM–12 PM—(9 flights)
  • 12–3 PM68%(76 flights)
  • 3–6 PM77%(106 flights)
  • 6–9 PM72%(39 flights)
  • 9 PM–12 AM—(8 flights)
On-time trend by month
69%
May

Aug 71% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202571%14
September 202586%29
October 202565%31
November 202579%28
December 202538%16
January 202674%23
February 202688%16
March 202676%25
April 202693%29
May 202669%26
Departures on time
75%
Diverted
0.4%
Flights flown
239
Months covered
12

Keep nerding

Based on 247 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.