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Flight Reliability

UA 4271 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4271 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

88%
Arrive within 15 minutes
1 min
Average arrival delay
0.6%
Cancelled
13 min early
Median arrival delay

Based on 330 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(45 flights)
  • Tue96%(45 flights)
  • Wed96%(44 flights)
  • Thu87%(45 flights)
  • Fri89%(44 flights)
  • Sat87%(52 flights)
  • Sun81%(52 flights)
On-time by departure window
  • 9 AM–12 PM91%(242 flights)
  • 12–3 PM77%(66 flights)
  • 6–9 PM84%(19 flights)
On-time trend by month
81%
May

Jun 55% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202555%11
July 202587%30
August 202581%31
September 202597%30
October 202594%31
November 202590%30
December 202584%31
January 202697%30
February 2026100%28
March 202686%14
April 202683%30
May 202681%31
Departures on time
91%
Diverted
0.3%
Flights flown
327
Months covered
12

Keep nerding

Based on 330 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.