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Flight Reliability

UA 581 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 581 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

75%
Arrive within 15 minutes
14 min
Average arrival delay
1.0%
Cancelled
1 min
Median arrival delay

Based on 392 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(54 flights)
  • Tue77%(56 flights)
  • Wed71%(56 flights)
  • Thu74%(57 flights)
  • Fri72%(57 flights)
  • Sat78%(51 flights)
  • Sun81%(57 flights)
On-time by departure window
  • 6–9 AM75%(20 flights)
  • 9 AM–12 PM80%(306 flights)
  • 12–3 PM33%(21 flights)
  • 3–6 PM59%(41 flights)
On-time trend by month
51%
May

Jun 69% → May 51% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%29
July 202571%31
August 202571%31
September 202580%30
October 202581%31
November 202593%29
December 202584%31
January 202681%31
February 202685%27
March 202677%30
April 202684%31
May 202651%57
Departures on time
80%
Diverted
0%
Flights flown
388
Months covered
12

Keep nerding

Based on 392 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.