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Flight Reliability

UA 1591 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1591 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

78%
Arrive within 15 minutes
7 min
Average arrival delay
0.9%
Cancelled
4 min early
Median arrival delay

Based on 458 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(68 flights)
  • Tue79%(56 flights)
  • Wed88%(64 flights)
  • Thu69%(68 flights)
  • Fri82%(68 flights)
  • Sat72%(61 flights)
  • Sun78%(68 flights)
On-time by departure window
  • 6–9 AM95%(21 flights)
  • 9 AM–12 PM87%(158 flights)
  • 12–3 PM74%(147 flights)
  • 6–9 PM69%(127 flights)
On-time trend by month
81%
May

Jun 63% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%30
July 202543%30
August 202577%31
September 202590%30
October 202581%31
November 202582%28
December 202594%31
January 202688%43
February 202687%46
March 202661%36
April 202680%55
May 202681%62
Departures on time
81%
Diverted
0.2%
Flights flown
453
Months covered
12

Keep nerding

Based on 458 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.