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Flight Reliability

UA 1831 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1831 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

74%
Arrive within 15 minutes
22 min
Average arrival delay
1.0%
Cancelled
3 min early
Median arrival delay

Based on 504 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon78%(72 flights)
  • Tue80%(71 flights)
  • Wed78%(71 flights)
  • Thu70%(73 flights)
  • Fri67%(73 flights)
  • Sat84%(67 flights)
  • Sun63%(71 flights)
On-time by departure window
  • 9 AM–12 PM91%(21 flights)
  • 12–3 PM76%(356 flights)
  • 3–6 PM64%(118 flights)
  • 6–9 PM—(3 flights)
On-time trend by month
82%
May

Jun 60% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%30
July 202560%30
August 202582%28
September 202570%30
October 202587%31
November 202570%30
December 202572%43
January 202671%34
February 202685%59
March 202665%62
April 202677%60
May 202682%61
Departures on time
77%
Diverted
0.2%
Flights flown
498
Months covered
12

Keep nerding

Based on 504 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.