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Flight Reliability

UA 4456 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4456 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
34 min
Average arrival delay
2.5%
Cancelled
3 min early
Median arrival delay

Based on 319 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon76%(41 flights)
  • Tue58%(43 flights)
  • Wed66%(41 flights)
  • Thu73%(41 flights)
  • Fri54%(43 flights)
  • Sat72%(54 flights)
  • Sun76%(46 flights)
On-time by departure window
  • 6–9 AM90%(40 flights)
  • 9 AM–12 PM74%(23 flights)
  • 3–6 PM85%(41 flights)
  • 6–9 PM59%(191 flights)
  • 9 PM–12 AM64%(14 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%27
August 202589%18
September 202569%29
October 202574%31
November 202552%27
December 202560%30
January 202652%31
February 202674%27
March 202633%27
April 202678%36
May 202683%18
Departures on time
73%
Diverted
0.6%
Flights flown
309
Months covered
12

Keep nerding

Based on 319 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.