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Flight Reliability

UA 517 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 517 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

87%
Arrive within 15 minutes
1 min early
Average arrival delay
1.3%
Cancelled
8 min early
Median arrival delay

Based on 520 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon87%(77 flights)
  • Tue90%(70 flights)
  • Wed88%(69 flights)
  • Thu88%(75 flights)
  • Fri84%(77 flights)
  • Sat85%(67 flights)
  • Sun84%(76 flights)
On-time by departure window
  • 6–9 AM95%(110 flights)
  • 9 AM–12 PM87%(46 flights)
  • 12–3 PM92%(162 flights)
  • 3–6 PM68%(82 flights)
  • 6–9 PM87%(95 flights)
  • 9 PM–12 AM69%(16 flights)
On-time trend by month
82%
May

Jun 93% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%14
July 2025100%30
August 2025100%30
September 202594%65
October 202586%85
November 202591%58
December 202584%73
January 202697%36
February 202686%28
March 202663%19
April 202662%45
May 202682%28
Departures on time
88%
Diverted
0.4%
Flights flown
511
Months covered
12

Keep nerding

Based on 520 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.