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Flight Reliability

UA 4012 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4012 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

80%
Arrive within 15 minutes
2 min
Average arrival delay
2.2%
Cancelled
11 min early
Median arrival delay

Based on 224 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(30 flights)
  • Tue79%(29 flights)
  • Wed79%(29 flights)
  • Thu82%(34 flights)
  • Fri85%(33 flights)
  • Sat76%(33 flights)
  • Sun81%(31 flights)
On-time by departure window
  • 3–6 AM95%(56 flights)
  • 6–9 AM92%(13 flights)
  • 9 AM–12 PM73%(11 flights)
  • 12–3 PM71%(102 flights)
  • 3–6 PM—(5 flights)
  • 6–9 PM84%(32 flights)
On-time trend by month
91%
May

Oct 77% → May 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
October 202577%31
November 202552%27
December 202553%19
January 202696%27
February 202696%28
March 202687%30
April 202683%30
May 202691%21
Departures on time
85%
Diverted
0%
Flights flown
219
Months covered
9

Keep nerding

Based on 224 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.