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Flight Reliability

UA 3686 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 3686 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

72%
Arrive within 15 minutes
15 min
Average arrival delay
3.2%
Cancelled
3 min early
Median arrival delay

Based on 343 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(47 flights)
  • Tue84%(49 flights)
  • Wed76%(49 flights)
  • Thu72%(47 flights)
  • Fri60%(48 flights)
  • Sat71%(44 flights)
  • Sun68%(47 flights)
On-time by departure window
  • 9 AM–12 PM76%(96 flights)
  • 12–3 PM92%(25 flights)
  • 3–6 PM67%(181 flights)
  • 6–9 PM72%(29 flights)
On-time trend by month
95%
May

Jun 67% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%30
July 202556%27
August 202573%30
September 202567%30
October 202568%31
November 202563%27
December 202579%29
January 202673%30
February 202677%26
March 202682%27
April 202672%25
May 202695%19
Departures on time
78%
Diverted
0.3%
Flights flown
331
Months covered
12

Keep nerding

Based on 343 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.