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Flight Reliability

UA 1858 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1858 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

89%
Arrive within 15 minutes
1 min
Average arrival delay
0.6%
Cancelled
8 min early
Median arrival delay

Based on 480 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon95%(78 flights)
  • Tue89%(61 flights)
  • Wed94%(65 flights)
  • Thu84%(81 flights)
  • Fri86%(80 flights)
  • Sat81%(36 flights)
  • Sun91%(76 flights)
On-time by departure window
  • 6–9 AM100%(18 flights)
  • 9 AM–12 PM93%(262 flights)
  • 12–3 PM83%(197 flights)
On-time trend by month
93%
May

Jun 100% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 202597%31
August 202597%37
September 202590%48
October 202585%65
November 202586%57
December 202563%32
January 202688%25
February 202691%21
March 202688%50
April 202694%52
May 202693%29
Departures on time
91%
Diverted
0%
Flights flown
477
Months covered
12

Keep nerding

Based on 480 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.