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Flight Reliability

UA 439 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 439 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

69%
Arrive within 15 minutes
16 min
Average arrival delay
1.7%
Cancelled
1 min early
Median arrival delay

Based on 361 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(50 flights)
  • Tue65%(46 flights)
  • Wed69%(51 flights)
  • Thu59%(54 flights)
  • Fri66%(50 flights)
  • Sat80%(51 flights)
  • Sun69%(51 flights)
On-time by departure window
  • 6–9 AM97%(37 flights)
  • 9 AM–12 PM87%(55 flights)
  • 12–3 PM90%(30 flights)
  • 3–6 PM—(5 flights)
  • 6–9 PM57%(226 flights)
On-time trend by month
60%
May

Jun 54% → May 60% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202554%35
July 202535%57
August 202541%17
October 202593%30
November 202597%30
December 202584%31
January 202671%31
February 202679%28
March 202676%33
April 202689%26
May 202660%30
Departures on time
68%
Diverted
0.6%
Flights flown
353
Months covered
12

Keep nerding

Based on 361 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.