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Flight Reliability

UA 4259 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4259 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
12 min
Average arrival delay
1.8%
Cancelled
10 min early
Median arrival delay

Based on 284 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(41 flights)
  • Tue87%(38 flights)
  • Wed92%(37 flights)
  • Thu83%(41 flights)
  • Fri86%(42 flights)
  • Sat92%(36 flights)
  • Sun80%(44 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 12–3 PM96%(24 flights)
  • 6–9 PM85%(254 flights)
On-time trend by month
87%
May

Jun 67% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%27
July 202577%31
August 202583%30
September 202585%20
October 202597%31
November 202590%29
December 202587%31
March 202685%27
April 2026100%11
May 202687%30
Departures on time
84%
Diverted
0%
Flights flown
279
Months covered
12

Keep nerding

Based on 284 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.