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Flight Reliability

UA 5129 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5129 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

73%
Arrive within 15 minutes
21 min
Average arrival delay
2.5%
Cancelled
4 min early
Median arrival delay

Based on 397 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon68%(59 flights)
  • Tue78%(46 flights)
  • Wed74%(57 flights)
  • Thu79%(58 flights)
  • Fri62%(58 flights)
  • Sat85%(46 flights)
  • Sun70%(57 flights)
On-time by departure window
  • 6–9 AM93%(14 flights)
  • 12–3 PM87%(115 flights)
  • 3–6 PM85%(91 flights)
  • 6–9 PM56%(112 flights)
  • 9 PM–12 AM53%(49 flights)
On-time trend by month
84%
May

Jun 44% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202544%34
July 202544%57
August 202556%43
September 202585%20
October 202583%24
November 202590%29
December 202591%34
January 202683%30
February 202686%28
March 202693%27
April 202688%24
May 202684%31
Departures on time
76%
Diverted
1.5%
Flights flown
381
Months covered
12

Keep nerding

Based on 397 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.