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Flight Reliability

UA 451 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 451 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

84%
Arrive within 15 minutes
2 min
Average arrival delay
0.3%
Cancelled
7 min early
Median arrival delay

Based on 389 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon93%(56 flights)
  • Tue82%(56 flights)
  • Wed89%(56 flights)
  • Thu91%(55 flights)
  • Fri80%(54 flights)
  • Sat83%(54 flights)
  • Sun72%(57 flights)
On-time by departure window
  • 6–9 AM89%(195 flights)
  • 9 AM–12 PM84%(94 flights)
  • 12–3 PM65%(31 flights)
  • 3–6 PM85%(26 flights)
  • 6–9 PM61%(18 flights)
  • 9 PM–12 AM92%(24 flights)
On-time trend by month
74%
May

Jun 89% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202589%54
July 202574%31
August 202571%31
September 202593%30
October 202590%31
November 202590%30
December 202567%30
January 202690%31
February 202693%28
March 202681%31
April 202697%30
May 202674%31
Departures on time
88%
Diverted
0%
Flights flown
388
Months covered
12

Keep nerding

Based on 389 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.