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Flight Reliability

UA 3684 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 3684 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

82%
Arrive within 15 minutes
3 min
Average arrival delay
6.5%
Cancelled
9 min early
Median arrival delay

Based on 308 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(40 flights)
  • Tue87%(37 flights)
  • Wed88%(43 flights)
  • Thu83%(42 flights)
  • Fri85%(39 flights)
  • Sat74%(46 flights)
  • Sun73%(40 flights)
On-time by departure window
  • 6–9 AM95%(81 flights)
  • 9 AM–12 PM91%(75 flights)
  • 12–3 PM78%(23 flights)
  • 3–6 PM60%(67 flights)
  • 6–9 PM74%(19 flights)
  • 9 PM–12 AM77%(22 flights)
On-time trend by month
100%
May

Jun 88% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%25
July 202542%19
August 202593%30
September 202597%30
October 202587%30
November 202578%27
December 202570%30
January 202679%19
February 202676%25
March 202683%12
April 202683%29
May 2026100%11
Departures on time
82%
Diverted
0.3%
Flights flown
287
Months covered
12

Keep nerding

Based on 308 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.