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Flight Reliability

UA 4390 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4390 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

62%
Arrive within 15 minutes
30 min
Average arrival delay
2.5%
Cancelled
4 min
Median arrival delay

Based on 393 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon67%(54 flights)
  • Tue67%(55 flights)
  • Wed63%(54 flights)
  • Thu59%(56 flights)
  • Fri52%(54 flights)
  • Sat59%(56 flights)
  • Sun65%(52 flights)
On-time by departure window
  • 6–9 AM81%(26 flights)
  • 9 AM–12 PM71%(24 flights)
  • 12–3 PM49%(85 flights)
  • 3–6 PM64%(173 flights)
  • 6–9 PM62%(73 flights)
On-time trend by month
73%
May

Jun 73% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202545%29
August 202563%30
September 202577%30
October 202530%27
November 202545%29
December 202539%31
January 202676%29
February 202679%24
March 202656%34
April 202674%58
May 202673%30
Departures on time
68%
Diverted
0.5%
Flights flown
381
Months covered
12

Keep nerding

Based on 393 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.