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Flight Reliability

UA 5021 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5021 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

68%
Arrive within 15 minutes
30 min
Average arrival delay
3.7%
Cancelled
0 min
Median arrival delay

Based on 382 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(49 flights)
  • Tue66%(55 flights)
  • Wed65%(52 flights)
  • Thu75%(51 flights)
  • Fri71%(51 flights)
  • Sat69%(49 flights)
  • Sun64%(52 flights)
On-time by departure window
  • 9 AM–12 PM83%(69 flights)
  • 12–3 PM74%(53 flights)
  • 3–6 PM53%(53 flights)
  • 6–9 PM54%(89 flights)
  • 9 PM–12 AM77%(95 flights)
On-time trend by month
48%
May

Jun 39% → May 48% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202539%28
July 202552%27
August 202568%40
September 202594%36
October 202586%29
November 202573%26
December 202560%25
January 202674%31
February 202675%28
March 202679%29
April 202662%29
May 202648%31
Departures on time
71%
Diverted
2.4%
Flights flown
359
Months covered
12

Keep nerding

Based on 382 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.