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Flight Reliability

UA 5100 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5100 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

69%
Arrive within 15 minutes
31 min
Average arrival delay
4.3%
Cancelled
2 min early
Median arrival delay

Based on 418 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(61 flights)
  • Tue61%(49 flights)
  • Wed75%(61 flights)
  • Thu70%(59 flights)
  • Fri70%(60 flights)
  • Sat77%(47 flights)
  • Sun60%(62 flights)
On-time by departure window
  • 9 AM–12 PM89%(18 flights)
  • 12–3 PM71%(326 flights)
  • 3–6 PM52%(44 flights)
  • 6–9 PM64%(11 flights)
On-time trend by month
58%
May

Jun 87% → May 58% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%45
July 202560%52
August 202563%43
September 202581%36
October 202594%31
November 202563%27
December 202576%21
January 202662%29
February 202675%28
March 202664%28
April 202646%28
May 202658%31
Departures on time
72%
Diverted
0.2%
Flights flown
399
Months covered
12

Keep nerding

Based on 418 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.