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Flight Reliability

UA 1023 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1023 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

68%
Arrive within 15 minutes
21 min
Average arrival delay
0.4%
Cancelled
2 min
Median arrival delay

Based on 519 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(76 flights)
  • Tue73%(70 flights)
  • Wed60%(70 flights)
  • Thu56%(73 flights)
  • Fri65%(74 flights)
  • Sat71%(73 flights)
  • Sun70%(79 flights)
On-time by departure window
  • 6–9 AM83%(24 flights)
  • 9 AM–12 PM87%(55 flights)
  • 12–3 PM67%(153 flights)
  • 3–6 PM60%(214 flights)
  • 9 PM–12 AM73%(69 flights)
On-time trend by month
87%
May

Jun 83% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202548%31
August 202565%31
September 202570%30
October 202563%43
November 202569%81
December 202567%61
January 202649%41
February 202657%28
March 202676%54
April 202660%30
May 202687%55
Departures on time
79%
Diverted
0.4%
Flights flown
515
Months covered
12

Keep nerding

Based on 519 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.