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Flight Reliability

UA 3423 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 3423 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
3 min early
Average arrival delay
2.1%
Cancelled
10 min early
Median arrival delay

Based on 375 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(51 flights)
  • Tue85%(52 flights)
  • Wed91%(53 flights)
  • Thu88%(50 flights)
  • Fri83%(54 flights)
  • Sat85%(52 flights)
  • Sun87%(54 flights)
On-time by departure window
  • 6–9 AM93%(159 flights)
  • 9 AM–12 PM88%(72 flights)
  • 12–3 PM72%(32 flights)
  • 3–6 PM93%(27 flights)
  • 6–9 PM75%(75 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
100%
May

Jun 93% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202590%31
August 202581%31
September 202593%28
October 202565%31
November 202568%28
December 202577%30
January 202677%30
February 202696%26
March 202697%29
April 202697%30
May 2026100%42
Departures on time
88%
Diverted
0.3%
Flights flown
366
Months covered
12

Keep nerding

Based on 375 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.