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Flight Reliability

UA 1156 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1156 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

64%
Arrive within 15 minutes
24 min
Average arrival delay
1.2%
Cancelled
5 min
Median arrival delay

Based on 571 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon59%(81 flights)
  • Tue67%(81 flights)
  • Wed65%(79 flights)
  • Thu63%(81 flights)
  • Fri61%(80 flights)
  • Sat75%(77 flights)
  • Sun60%(84 flights)
On-time by departure window
  • 6–9 AM100%(21 flights)
  • 9 AM–12 PM89%(35 flights)
  • 12–3 PM71%(24 flights)
  • 3–6 PM62%(281 flights)
  • 6–9 PM58%(200 flights)
  • 9 PM–12 AM—(2 flights)
On-time trend by month
80%
May

Jun 53% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%60
July 202543%60
August 202553%59
September 202565%54
October 202565%37
November 202589%28
December 202574%31
January 202687%30
February 202668%28
March 202658%52
April 202662%53
May 202680%71
Departures on time
70%
Diverted
0.2%
Flights flown
563
Months covered
12

Keep nerding

Based on 571 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.