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Flight Reliability

UA 255 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 255 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

76%
Arrive within 15 minutes
12 min
Average arrival delay
1.0%
Cancelled
9 min early
Median arrival delay

Based on 407 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(58 flights)
  • Tue83%(57 flights)
  • Wed64%(56 flights)
  • Thu71%(59 flights)
  • Fri78%(60 flights)
  • Sat77%(56 flights)
  • Sun80%(56 flights)
On-time by departure window
  • 6–9 AM87%(78 flights)
  • 9 AM–12 PM79%(119 flights)
  • 12–3 PM84%(104 flights)
  • 3–6 PM71%(14 flights)
  • 6–9 PM53%(87 flights)
On-time trend by month
97%
May

Jun 41% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202541%17
July 202539%31
August 202565%40
September 202588%50
October 202571%31
November 202583%30
December 202573%30
January 202689%45
February 202694%36
March 202674%31
April 202667%30
May 202697%31
Departures on time
76%
Diverted
0.2%
Flights flown
402
Months covered
12

Keep nerding

Based on 407 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.