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Flight Reliability

UA 3420 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 3420 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

81%
Arrive within 15 minutes
2 min
Average arrival delay
5.0%
Cancelled
10 min early
Median arrival delay

Based on 358 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(49 flights)
  • Tue81%(48 flights)
  • Wed77%(48 flights)
  • Thu83%(47 flights)
  • Fri78%(49 flights)
  • Sat80%(50 flights)
  • Sun79%(48 flights)
On-time by departure window
  • 6–9 AM81%(26 flights)
  • 9 AM–12 PM93%(53 flights)
  • 12–3 PM74%(27 flights)
  • 3–6 PM77%(68 flights)
  • 6–9 PM79%(165 flights)
On-time trend by month
90%
May

Jun 78% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%23
July 202593%30
August 202584%31
September 202580%30
October 202570%30
November 202586%22
December 202579%29
January 202676%29
February 202681%26
March 202677%31
April 202672%29
May 202690%29
Departures on time
84%
Diverted
0.3%
Flights flown
339
Months covered
12

Keep nerding

Based on 358 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.