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Flight Reliability

UA 1517 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1517 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

72%
Arrive within 15 minutes
23 min
Average arrival delay
2.7%
Cancelled
4 min early
Median arrival delay

Based on 402 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(56 flights)
  • Tue78%(55 flights)
  • Wed71%(61 flights)
  • Thu78%(58 flights)
  • Fri72%(60 flights)
  • Sat73%(40 flights)
  • Sun70%(57 flights)
On-time by departure window
  • 6–9 AM94%(17 flights)
  • 9 AM–12 PM84%(145 flights)
  • 3–6 PM39%(28 flights)
  • 6–9 PM67%(193 flights)
  • 9 PM–12 AM—(4 flights)
On-time trend by month
68%
May

Jun 93% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202550%56
August 202587%31
September 202597%34
October 202573%51
November 202552%27
December 202578%27
January 202683%24
February 202681%26
March 202664%28
April 202656%25
May 202668%28
Departures on time
72%
Diverted
1.0%
Flights flown
387
Months covered
12

Keep nerding

Based on 402 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.