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Flight Reliability

UA 2135 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 2135 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

82%
Arrive within 15 minutes
3 min
Average arrival delay
0.5%
Cancelled
8 min early
Median arrival delay

Based on 766 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(108 flights)
  • Tue82%(107 flights)
  • Wed87%(110 flights)
  • Thu86%(110 flights)
  • Fri80%(112 flights)
  • Sat80%(101 flights)
  • Sun78%(110 flights)
On-time by departure window
  • 6–9 AM92%(327 flights)
  • 12–3 PM78%(310 flights)
  • 3–6 PM55%(42 flights)
  • 6–9 PM66%(68 flights)
  • 9 PM–12 AM73%(11 flights)
On-time trend by month
78%
May

Jun 53% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%32
July 202573%56
August 202581%72
September 202582%90
October 202576%87
November 202574%54
December 202584%61
January 202697%62
February 2026100%54
March 202683%57
April 202690%60
May 202678%73
Departures on time
82%
Diverted
0.5%
Flights flown
758
Months covered
12

Keep nerding

Based on 766 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.