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Flight Reliability

UA 5321 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5321 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

69%
Arrive within 15 minutes
17 min
Average arrival delay
1.7%
Cancelled
0 min
Median arrival delay

Based on 351 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(51 flights)
  • Tue78%(49 flights)
  • Wed62%(50 flights)
  • Thu70%(50 flights)
  • Fri67%(52 flights)
  • Sat71%(45 flights)
  • Sun57%(47 flights)
On-time by departure window
  • 6–9 AM79%(29 flights)
  • 9 AM–12 PM66%(88 flights)
  • 12–3 PM76%(173 flights)
  • 3–6 PM42%(48 flights)
  • 6–9 PM—(6 flights)
On-time trend by month
65%
May

Jun 40% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202540%30
July 202579%28
August 202577%31
September 202590%29
October 202592%24
November 202564%28
December 202555%31
January 202662%29
February 202670%27
March 202659%29
April 202678%27
May 202665%31
Departures on time
72%
Diverted
0.3%
Flights flown
344
Months covered
12

Keep nerding

Based on 351 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.