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Flight Reliability

UA 4003 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4003 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

89%
Arrive within 15 minutes
6 min early
Average arrival delay
1.2%
Cancelled
14 min early
Median arrival delay

Based on 248 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(34 flights)
  • Tue94%(35 flights)
  • Wed94%(34 flights)
  • Thu86%(36 flights)
  • Fri94%(36 flights)
  • Sat94%(36 flights)
  • Sun79%(34 flights)
On-time by departure window
  • 6–9 AM79%(33 flights)
  • 9 AM–12 PM92%(131 flights)
  • 3–6 PM89%(81 flights)
On-time trend by month
87%
May

Oct 94% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
October 202594%31
November 202597%29
December 202594%31
January 202690%30
February 202693%28
March 202673%30
April 202687%30
May 202687%30
Departures on time
91%
Diverted
0%
Flights flown
245
Months covered
9

Keep nerding

Based on 248 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.