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Flight Reliability

UA 643 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 643 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

81%
Arrive within 15 minutes
5 min
Average arrival delay
0.1%
Cancelled
7 min early
Median arrival delay

Based on 795 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(112 flights)
  • Tue79%(114 flights)
  • Wed89%(114 flights)
  • Thu76%(113 flights)
  • Fri77%(113 flights)
  • Sat83%(113 flights)
  • Sun82%(114 flights)
On-time by departure window
  • 3–6 AM95%(20 flights)
  • 6–9 AM92%(195 flights)
  • 9 AM–12 PM81%(218 flights)
  • 12–3 PM72%(74 flights)
  • 3–6 PM75%(286 flights)
On-time trend by month
86%
May

Jun 57% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%35
July 202550%62
August 202566%56
September 202581%78
October 202584%31
November 202597%30
December 202577%75
January 202687%93
February 202689%84
March 202691%69
April 202690%90
May 202686%90
Departures on time
86%
Diverted
0.1%
Flights flown
793
Months covered
12

Keep nerding

Based on 795 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.