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Flight Reliability

UA 1531 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1531 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

59%
Arrive within 15 minutes
29 min
Average arrival delay
1.3%
Cancelled
10 min
Median arrival delay

Based on 784 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon58%(108 flights)
  • Tue64%(111 flights)
  • Wed58%(112 flights)
  • Thu56%(110 flights)
  • Fri51%(112 flights)
  • Sat65%(107 flights)
  • Sun61%(113 flights)
On-time by departure window
  • 6–9 AM91%(88 flights)
  • 3–6 PM56%(393 flights)
  • 6–9 PM53%(292 flights)
On-time trend by month
69%
May

Jun 61% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202561%59
July 202537%59
August 202557%72
September 202551%84
October 202571%68
November 202570%87
December 202560%77
January 202650%62
February 202661%49
March 202669%54
April 202649%51
May 202669%51
Departures on time
67%
Diverted
0.1%
Flights flown
773
Months covered
12

Keep nerding

Based on 784 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.