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Flight Reliability

UA 4331 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4331 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

83%
Arrive within 15 minutes
6 min
Average arrival delay
2.1%
Cancelled
10 min early
Median arrival delay

Based on 280 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(36 flights)
  • Tue87%(31 flights)
  • Wed80%(45 flights)
  • Thu84%(37 flights)
  • Fri87%(39 flights)
  • Sat84%(38 flights)
  • Sun79%(48 flights)
On-time by departure window
  • 6–9 AM85%(13 flights)
  • 9 AM–12 PM87%(206 flights)
  • 3–6 PM67%(55 flights)
On-time trend by month
81%
May

Jun 70% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%23
July 202533%12
August 202583%12
October 202593%30
November 202576%21
December 202579%29
January 202693%30
February 202696%23
March 202696%28
April 202677%26
May 202681%31
Departures on time
86%
Diverted
0%
Flights flown
274
Months covered
12

Keep nerding

Based on 280 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.