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Flight Reliability

UA 721 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 721 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

78%
Arrive within 15 minutes
11 min
Average arrival delay
2.0%
Cancelled
3 min early
Median arrival delay

Based on 405 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(57 flights)
  • Tue85%(58 flights)
  • Wed77%(57 flights)
  • Thu77%(57 flights)
  • Fri74%(58 flights)
  • Sat82%(51 flights)
  • Sun74%(58 flights)
On-time by departure window
  • 9 AM–12 PM86%(73 flights)
  • 12–3 PM76%(305 flights)
  • 3–6 PM72%(18 flights)
On-time trend by month
87%
May

Jun 77% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%52
July 202577%31
August 202581%31
September 202575%28
October 202557%30
November 202569%29
December 202577%31
January 202676%29
February 202685%40
March 202680%35
April 202693%30
May 202687%30
Departures on time
85%
Diverted
0.2%
Flights flown
396
Months covered
12

Keep nerding

Based on 405 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.