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Flight Reliability

UA 4858 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4858 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

78%
Arrive within 15 minutes
7 min
Average arrival delay
2.0%
Cancelled
8 min early
Median arrival delay

Based on 200 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(27 flights)
  • Tue82%(28 flights)
  • Wed82%(27 flights)
  • Thu85%(26 flights)
  • Fri74%(27 flights)
  • Sat74%(27 flights)
  • Sun71%(34 flights)
On-time by departure window
  • 9 AM–12 PM—(2 flights)
  • 12–3 PM77%(143 flights)
  • 6–9 PM82%(51 flights)
On-time trend by month
93%
May

Nov 79% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
November 202579%29
December 202565%31
January 202669%29
February 202693%28
April 202676%29
May 202693%30
Departures on time
81%
Diverted
0%
Flights flown
196
Months covered
11

Keep nerding

Based on 200 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.