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Flight Reliability

UA 4398 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4398 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

55%
Arrive within 15 minutes
48 min
Average arrival delay
6.7%
Cancelled
9 min
Median arrival delay

Based on 328 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon59%(46 flights)
  • Tue54%(46 flights)
  • Wed49%(45 flights)
  • Thu62%(42 flights)
  • Fri51%(43 flights)
  • Sat60%(42 flights)
  • Sun52%(42 flights)
On-time by departure window
  • 3–6 AM79%(14 flights)
  • 6–9 AM67%(18 flights)
  • 12–3 PM56%(140 flights)
  • 3–6 PM48%(31 flights)
  • 6–9 PM52%(103 flights)
On-time trend by month
79%
May

Jul 39% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
July 202539%28
August 202545%31
September 202562%29
October 202533%30
November 202554%24
December 202542%26
January 202663%30
February 202661%28
March 202668%31
April 202674%27
May 202679%19
Departures on time
62%
Diverted
0%
Flights flown
306
Months covered
12

Keep nerding

Based on 328 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.