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Flight Reliability

UA 4563 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4563 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

82%
Arrive within 15 minutes
10 min
Average arrival delay
2.8%
Cancelled
10 min early
Median arrival delay

Based on 325 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(48 flights)
  • Tue87%(45 flights)
  • Wed81%(43 flights)
  • Thu86%(49 flights)
  • Fri85%(47 flights)
  • Sat75%(40 flights)
  • Sun75%(44 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM92%(84 flights)
  • 12–3 PM80%(186 flights)
  • 3–6 PM69%(32 flights)
  • 6–9 PM77%(13 flights)
On-time trend by month
68%
May

Jun 83% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202577%31
August 202584%31
September 202590%29
October 202585%27
November 202576%25
December 202559%17
January 202684%25
February 202692%25
March 202683%30
April 2026100%15
May 202668%31
Departures on time
81%
Diverted
0%
Flights flown
316
Months covered
12

Keep nerding

Based on 325 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.