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Flight Reliability

UA 4383 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4383 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

73%
Arrive within 15 minutes
25 min
Average arrival delay
2.8%
Cancelled
6 min early
Median arrival delay

Based on 353 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(43 flights)
  • Tue74%(50 flights)
  • Wed75%(52 flights)
  • Thu65%(48 flights)
  • Fri73%(51 flights)
  • Sat80%(49 flights)
  • Sun65%(48 flights)
On-time by departure window
  • 6–9 AM80%(50 flights)
  • 9 AM–12 PM78%(113 flights)
  • 12–3 PM66%(56 flights)
  • 3–6 PM72%(58 flights)
  • 6–9 PM64%(64 flights)
On-time trend by month
76%
May

Jun 93% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%29
July 202563%30
August 202555%29
September 202590%30
October 202590%31
November 202572%25
December 202536%28
January 202659%27
February 202689%26
March 202676%29
April 202671%28
May 202676%29
Departures on time
75%
Diverted
0.6%
Flights flown
341
Months covered
12

Keep nerding

Based on 353 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.