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Flight Reliability

UA 1181 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1181 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

85%
Arrive within 15 minutes
1 min early
Average arrival delay
1.0%
Cancelled
11 min early
Median arrival delay

Based on 495 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(71 flights)
  • Tue90%(67 flights)
  • Wed87%(67 flights)
  • Thu83%(70 flights)
  • Fri85%(68 flights)
  • Sat86%(70 flights)
  • Sun86%(72 flights)
On-time by departure window
  • 6–9 AM93%(262 flights)
  • 12–3 PM—(6 flights)
  • 3–6 PM78%(196 flights)
  • 6–9 PM71%(21 flights)
On-time trend by month
78%
May

Jun 68% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%50
July 202593%27
August 202569%45
September 202586%36
October 202587%61
November 202579%58
December 2025100%46
January 2026100%36
February 202696%28
March 202697%31
April 202687%30
May 202678%37
Departures on time
87%
Diverted
1.0%
Flights flown
485
Months covered
12

Keep nerding

Based on 495 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.