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Flight Reliability

UA 4555 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4555 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

66%
Arrive within 15 minutes
27 min
Average arrival delay
4.0%
Cancelled
0 min
Median arrival delay

Based on 324 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(46 flights)
  • Tue76%(42 flights)
  • Wed74%(42 flights)
  • Thu60%(47 flights)
  • Fri59%(44 flights)
  • Sat57%(42 flights)
  • Sun62%(47 flights)
On-time by departure window
  • 6–9 AM85%(87 flights)
  • 9 AM–12 PM—(6 flights)
  • 12–3 PM70%(10 flights)
  • 3–6 PM57%(207 flights)
On-time trend by month
71%
May

Jun 55% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202555%29
July 202528%18
August 202565%26
September 202593%27
October 202573%30
November 202544%25
December 202552%27
January 202662%29
February 202682%28
March 202664%28
April 202685%26
May 202671%17
Departures on time
73%
Diverted
0.3%
Flights flown
310
Months covered
12

Keep nerding

Based on 324 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.