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Flight Reliability

UA 366 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 366 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

88%
Arrive within 15 minutes
4 min early
Average arrival delay
3.1%
Cancelled
11 min early
Median arrival delay

Based on 354 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon85%(48 flights)
  • Tue89%(44 flights)
  • Wed89%(47 flights)
  • Thu94%(53 flights)
  • Fri87%(52 flights)
  • Sat90%(51 flights)
  • Sun81%(48 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM95%(102 flights)
  • 9 AM–12 PM95%(61 flights)
  • 12–3 PM84%(45 flights)
  • 3–6 PM80%(69 flights)
  • 6–9 PM88%(40 flights)
  • 9 PM–12 AM72%(25 flights)
On-time trend by month
94%
May

Aug 100% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 2025100%13
September 2025100%29
October 202587%31
November 202585%58
December 202589%18
January 202687%39
February 202686%42
March 202687%55
April 202678%27
May 202694%31
Departures on time
89%
Diverted
0%
Flights flown
343
Months covered
10

Keep nerding

Based on 354 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.