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Flight Reliability

UA 5721 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5721 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
21 min
Average arrival delay
3.5%
Cancelled
1 min early
Median arrival delay

Based on 342 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(47 flights)
  • Tue68%(50 flights)
  • Wed70%(46 flights)
  • Thu65%(48 flights)
  • Fri71%(49 flights)
  • Sat74%(43 flights)
  • Sun70%(47 flights)
On-time by departure window
  • 6–9 AM68%(126 flights)
  • 9 AM–12 PM59%(17 flights)
  • 12–3 PM—(4 flights)
  • 3–6 PM78%(58 flights)
  • 6–9 PM68%(125 flights)
On-time trend by month
77%
May

Jun 64% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%28
July 202573%30
August 202561%28
September 202567%27
October 202565%31
November 202596%28
December 202562%29
January 202677%30
February 202682%27
March 202643%30
April 202669%29
May 202677%13
Departures on time
76%
Diverted
0%
Flights flown
330
Months covered
12

Keep nerding

Based on 342 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.