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Flight Reliability

UA 398 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 398 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

86%
Arrive within 15 minutes
2 min
Average arrival delay
1.7%
Cancelled
9 min early
Median arrival delay

Based on 362 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon90%(50 flights)
  • Tue89%(54 flights)
  • Wed87%(55 flights)
  • Thu86%(51 flights)
  • Fri92%(52 flights)
  • Sat75%(44 flights)
  • Sun80%(49 flights)
On-time by departure window
  • 6–9 AM92%(218 flights)
  • 9 AM–12 PM88%(43 flights)
  • 12–3 PM67%(67 flights)
  • 3–6 PM78%(27 flights)
On-time trend by month
95%
May

Jun 94% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202594%48
July 202590%31
August 202587%30
September 202597%30
October 202583%30
November 202565%23
December 202562%29
January 202679%29
February 202689%26
March 202686%29
April 202697%30
May 202695%20
Departures on time
89%
Diverted
0.3%
Flights flown
355
Months covered
12

Keep nerding

Based on 362 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.