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Flight Reliability

UA 323 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 323 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

80%
Arrive within 15 minutes
7 min
Average arrival delay
0.8%
Cancelled
7 min early
Median arrival delay

Based on 373 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(56 flights)
  • Tue87%(54 flights)
  • Wed85%(47 flights)
  • Thu84%(55 flights)
  • Fri66%(56 flights)
  • Sat80%(51 flights)
  • Sun84%(49 flights)
On-time by departure window
  • 6–9 AM83%(64 flights)
  • 9 AM–12 PM90%(41 flights)
  • 12–3 PM78%(201 flights)
  • 3–6 PM72%(43 flights)
  • 6–9 PM95%(19 flights)
On-time trend by month
83%
May

Jun 85% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202585%34
July 202574%23
August 202584%49
September 202589%28
October 202593%27
November 202572%29
December 202577%30
January 202669%29
February 202689%28
March 202671%31
April 202677%30
May 202683%30
Departures on time
81%
Diverted
0.5%
Flights flown
368
Months covered
12

Keep nerding

Based on 373 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.