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Flight Reliability

UA 3518 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 3518 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
3 min early
Average arrival delay
5.1%
Cancelled
13 min early
Median arrival delay

Based on 336 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon87%(46 flights)
  • Tue86%(44 flights)
  • Wed81%(48 flights)
  • Thu89%(47 flights)
  • Fri80%(46 flights)
  • Sat84%(43 flights)
  • Sun82%(45 flights)
On-time by departure window
  • 6–9 AM92%(125 flights)
  • 9 AM–12 PM77%(22 flights)
  • 12–3 PM88%(59 flights)
  • 3–6 PM71%(62 flights)
  • 6–9 PM80%(51 flights)
On-time trend by month
83%
May

Jun 83% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202583%29
August 202597%30
September 2025100%30
October 202584%31
November 202574%23
December 202572%29
January 202685%27
February 202689%26
March 202672%25
April 202685%27
May 202683%12
Departures on time
88%
Diverted
0%
Flights flown
319
Months covered
12

Keep nerding

Based on 336 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.