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Flight Reliability

UA 2399 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 2399 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

86%
Arrive within 15 minutes
3 min early
Average arrival delay
0%
Cancelled
11 min early
Median arrival delay

Based on 367 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(55 flights)
  • Tue88%(56 flights)
  • Wed90%(51 flights)
  • Thu77%(56 flights)
  • Fri82%(49 flights)
  • Sat94%(46 flights)
  • Sun91%(54 flights)
On-time by departure window
  • 6–9 AM94%(163 flights)
  • 12–3 PM74%(46 flights)
  • 3–6 PM82%(158 flights)
On-time trend by month
84%
May

Jun 53% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%17
July 202561%23
August 202576%25
September 202597%30
October 202587%31
November 202586%29
December 202597%31
January 202697%31
February 202696%27
March 202694%31
April 202690%31
May 202684%61
Departures on time
87%
Diverted
0%
Flights flown
367
Months covered
12

Keep nerding

Based on 367 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.