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Flight Reliability

UA 5135 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5135 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

55%
Arrive within 15 minutes
40 min
Average arrival delay
8.3%
Cancelled
12 min
Median arrival delay

Based on 375 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon44%(54 flights)
  • Tue70%(30 flights)
  • Wed61%(57 flights)
  • Thu50%(56 flights)
  • Fri45%(58 flights)
  • Sat65%(31 flights)
  • Sun61%(56 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 12–3 PM—(7 flights)
  • 3–6 PM61%(69 flights)
  • 6–9 PM53%(265 flights)
On-time trend by month
54%
May

Jun 32% → May 54% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202532%28
July 202551%57
August 202558%43
September 202567%30
October 202543%30
November 202554%26
December 202562%21
January 202655%20
February 202671%21
March 202658%19
April 202668%19
May 202654%28
Departures on time
68%
Diverted
0.5%
Flights flown
342
Months covered
12

Keep nerding

Based on 375 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.