Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 4581 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4581 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

77%
Arrive within 15 minutes
13 min
Average arrival delay
4.2%
Cancelled
7 min early
Median arrival delay

Based on 307 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon70%(40 flights)
  • Tue80%(44 flights)
  • Wed76%(41 flights)
  • Thu81%(43 flights)
  • Fri73%(41 flights)
  • Sat78%(41 flights)
  • Sun81%(43 flights)
On-time by departure window
  • 6–9 AM91%(22 flights)
  • 9 AM–12 PM79%(107 flights)
  • 12–3 PM81%(48 flights)
  • 3–6 PM78%(40 flights)
  • 6–9 PM65%(26 flights)
  • 9 PM–12 AM70%(50 flights)
On-time trend by month
64%
May

Jun 80% → May 64% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%10
July 202593%30
August 202573%30
September 2025100%24
November 202573%26
December 202570%27
January 202667%30
February 202673%26
March 202693%28
April 202667%27
May 202664%28
Departures on time
78%
Diverted
0.3%
Flights flown
293
Months covered
12

Keep nerding

Based on 307 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.