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Flight Reliability

UA 623 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 623 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
6 min
Average arrival delay
2.7%
Cancelled
5 min early
Median arrival delay

Based on 513 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(69 flights)
  • Tue78%(68 flights)
  • Wed77%(74 flights)
  • Thu85%(74 flights)
  • Fri83%(72 flights)
  • Sat75%(64 flights)
  • Sun79%(76 flights)
On-time by departure window
  • 6–9 AM71%(14 flights)
  • 9 AM–12 PM81%(326 flights)
  • 12–3 PM80%(133 flights)
  • 3–6 PM87%(15 flights)
  • 6–9 PM—(9 flights)
On-time trend by month
80%
May

Jun 79% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%28
July 202579%28
August 202584%43
September 202587%60
October 202570%56
November 202583%30
December 202573%30
January 202690%29
February 202692%26
March 202671%55
April 202682%56
May 202680%56
Departures on time
87%
Diverted
0.4%
Flights flown
497
Months covered
12

Keep nerding

Based on 513 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.