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Flight Reliability

UA 5439 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5439 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

68%
Arrive within 15 minutes
17 min
Average arrival delay
3.2%
Cancelled
0 min
Median arrival delay

Based on 339 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(47 flights)
  • Tue71%(45 flights)
  • Wed74%(42 flights)
  • Thu67%(49 flights)
  • Fri64%(47 flights)
  • Sat60%(42 flights)
  • Sun74%(50 flights)
On-time by departure window
  • 6–9 AM69%(48 flights)
  • 9 AM–12 PM84%(19 flights)
  • 12–3 PM66%(243 flights)
  • 6–9 PM—(1 flights)
  • 9 PM–12 AM91%(11 flights)
On-time trend by month
65%
May

Jun 83% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202577%22
August 202588%24
September 202576%29
October 202579%28
November 202561%18
December 202550%30
January 202661%28
February 202669%26
March 202654%28
April 202657%28
May 202665%31
Departures on time
71%
Diverted
1.8%
Flights flown
322
Months covered
12

Keep nerding

Based on 339 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.