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Flight Reliability

UA 6309 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 6309 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

75%
Arrive within 15 minutes
11 min
Average arrival delay
0.3%
Cancelled
7 min early
Median arrival delay

Based on 292 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(42 flights)
  • Tue65%(46 flights)
  • Wed73%(40 flights)
  • Thu81%(48 flights)
  • Fri79%(47 flights)
  • Sat79%(29 flights)
  • Sun72%(39 flights)
On-time by departure window
  • 9 AM–12 PM83%(149 flights)
  • 3–6 PM67%(142 flights)
On-time trend by month
87%
May

Jun 43% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202543%30
July 202565%31
August 202555%31
September 202590%29
October 202592%26
November 202587%23
December 202582%17
January 202668%25
February 202694%16
March 202683%18
April 202682%22
May 202687%23
Departures on time
77%
Diverted
0%
Flights flown
291
Months covered
12

Keep nerding

Based on 292 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.