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Flight Reliability

UA 5858 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5858 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
5 min
Average arrival delay
2.1%
Cancelled
8 min early
Median arrival delay

Based on 286 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(43 flights)
  • Tue86%(35 flights)
  • Wed79%(28 flights)
  • Thu79%(47 flights)
  • Fri84%(49 flights)
  • Sat85%(33 flights)
  • Sun78%(45 flights)
On-time by departure window
  • 9 AM–12 PM83%(63 flights)
  • 12–3 PM75%(73 flights)
  • 3–6 PM90%(129 flights)
  • 9 PM–12 AM33%(15 flights)
On-time trend by month
91%
May

Jun 97% → May 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%29
July 202585%27
August 202589%18
September 202578%18
October 202596%24
November 202571%24
December 202539%13
January 202671%21
February 202683%23
March 202667%30
April 202690%30
May 202691%23
Departures on time
81%
Diverted
0%
Flights flown
280
Months covered
12

Keep nerding

Based on 286 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.