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Flight Reliability

UA 1597 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1597 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

81%
Arrive within 15 minutes
2 min
Average arrival delay
1.0%
Cancelled
7 min early
Median arrival delay

Based on 414 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon88%(57 flights)
  • Tue84%(55 flights)
  • Wed77%(61 flights)
  • Thu72%(61 flights)
  • Fri76%(59 flights)
  • Sat87%(54 flights)
  • Sun83%(63 flights)
On-time by departure window
  • 6–9 AM73%(84 flights)
  • 9 AM–12 PM93%(71 flights)
  • 12–3 PM89%(64 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM78%(111 flights)
  • 9 PM–12 AM75%(79 flights)
On-time trend by month
76%
May

Jun 86% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%49
July 202577%57
August 202587%31
September 202597%30
October 202594%31
November 202572%25
December 202568%31
February 202694%17
March 202679%34
April 202678%59
May 202676%41
Departures on time
82%
Diverted
0%
Flights flown
410
Months covered
12

Keep nerding

Based on 414 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.