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Flight Reliability

UA 2439 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 2439 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

77%
Arrive within 15 minutes
12 min
Average arrival delay
0.9%
Cancelled
3 min early
Median arrival delay

Based on 343 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(47 flights)
  • Tue76%(41 flights)
  • Wed75%(52 flights)
  • Thu79%(52 flights)
  • Fri69%(49 flights)
  • Sat83%(48 flights)
  • Sun77%(51 flights)
On-time by departure window
  • 6–9 AM96%(77 flights)
  • 9 AM–12 PM82%(17 flights)
  • 12–3 PM75%(52 flights)
  • 3–6 PM68%(181 flights)
  • 6–9 PM77%(13 flights)
On-time trend by month
79%
May

Jun 53% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%30
July 202563%30
August 202560%30
September 202560%30
October 202559%29
November 202583%24
December 202590%30
January 202688%25
February 202696%23
March 202694%31
April 2026100%30
May 202679%28
Departures on time
77%
Diverted
0%
Flights flown
340
Months covered
12

Keep nerding

Based on 343 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.