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Flight Reliability

UA 2331 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 2331 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

82%
Arrive within 15 minutes
6 min
Average arrival delay
0.7%
Cancelled
8 min early
Median arrival delay

Based on 954 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(133 flights)
  • Tue85%(133 flights)
  • Wed79%(136 flights)
  • Thu87%(136 flights)
  • Fri78%(137 flights)
  • Sat84%(135 flights)
  • Sun80%(135 flights)
On-time by departure window
  • 6–9 AM97%(30 flights)
  • 9 AM–12 PM93%(293 flights)
  • 12–3 PM81%(361 flights)
  • 3–6 PM71%(156 flights)
  • 6–9 PM67%(105 flights)
On-time trend by month
82%
May

Jun 86% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%65
July 202579%92
August 202584%74
September 202577%90
October 202587%79
November 202579%29
December 202578%91
January 202687%90
February 202685%67
March 202680%89
April 202681%88
May 202682%91
Departures on time
85%
Diverted
0.2%
Flights flown
945
Months covered
12

Keep nerding

Based on 954 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.