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Flight Reliability

UA 1811 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1811 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

81%
Arrive within 15 minutes
3 min
Average arrival delay
1.0%
Cancelled
8 min early
Median arrival delay

Based on 689 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(99 flights)
  • Tue78%(88 flights)
  • Wed88%(90 flights)
  • Thu86%(99 flights)
  • Fri77%(100 flights)
  • Sat76%(100 flights)
  • Sun80%(104 flights)
On-time by departure window
  • 3–6 AM88%(16 flights)
  • 6–9 AM84%(163 flights)
  • 9 AM–12 PM89%(177 flights)
  • 12–3 PM75%(307 flights)
  • 3–6 PM71%(17 flights)
On-time trend by month
88%
May

Jun 88% → May 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%76
July 202582%62
August 202571%62
September 202574%54
October 202581%36
November 202586%57
December 202571%61
January 202675%51
February 202692%47
March 202681%57
April 202685%59
May 202688%58
Departures on time
83%
Diverted
0.3%
Flights flown
680
Months covered
12

Keep nerding

Based on 689 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.