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Flight Reliability

UA 1515 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1515 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

84%
Arrive within 15 minutes
0 min
Average arrival delay
0.4%
Cancelled
10 min early
Median arrival delay

Based on 270 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(41 flights)
  • Tue83%(35 flights)
  • Wed81%(37 flights)
  • Thu85%(39 flights)
  • Fri81%(42 flights)
  • Sat88%(34 flights)
  • Sun83%(41 flights)
On-time by departure window
  • 6–9 AM98%(40 flights)
  • 12–3 PM95%(79 flights)
  • 3–6 PM68%(114 flights)
  • 6–9 PM92%(36 flights)
On-time trend by month
52%
May

Aug 62% → May 52% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202562%13
September 202576%29
October 202596%27
November 202587%55
December 2025100%18
January 202692%25
February 202696%24
March 202697%29
April 202672%18
May 202652%31
Departures on time
81%
Diverted
0%
Flights flown
269
Months covered
10

Keep nerding

Based on 270 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.