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Flight Reliability

UA 4181 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4181 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
25 min
Average arrival delay
2.5%
Cancelled
8 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(47 flights)
  • Tue76%(50 flights)
  • Wed82%(51 flights)
  • Thu75%(51 flights)
  • Fri81%(52 flights)
  • Sat80%(51 flights)
  • Sun75%(51 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM84%(196 flights)
  • 9 AM–12 PM71%(48 flights)
  • 12–3 PM76%(38 flights)
  • 3–6 PM50%(40 flights)
  • 6–9 PM73%(30 flights)
On-time trend by month
84%
May

Jun 70% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%30
July 202557%28
August 202555%29
September 2025100%30
October 202584%31
November 202586%29
December 202573%30
January 202668%28
February 202689%28
March 202667%30
April 202683%29
May 202684%31
Departures on time
81%
Diverted
0.3%
Flights flown
353
Months covered
12

Keep nerding

Based on 363 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.