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Flight Reliability

UA 3635 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 3635 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

79%
Arrive within 15 minutes
11 min
Average arrival delay
3.2%
Cancelled
9 min early
Median arrival delay

Based on 402 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon76%(54 flights)
  • Tue80%(55 flights)
  • Wed81%(57 flights)
  • Thu84%(55 flights)
  • Fri78%(54 flights)
  • Sat86%(49 flights)
  • Sun73%(64 flights)
On-time by departure window
  • 6–9 AM88%(24 flights)
  • 9 AM–12 PM81%(69 flights)
  • 12–3 PM80%(153 flights)
  • 3–6 PM78%(27 flights)
  • 6–9 PM81%(31 flights)
  • 9 PM–12 AM75%(84 flights)
On-time trend by month
87%
May

Jun 78% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%27
July 202581%36
August 202583%35
September 202592%25
October 202571%14
November 202572%54
December 202571%31
January 202685%26
February 202696%27
March 202668%53
April 202683%30
May 202687%30
Departures on time
84%
Diverted
0.2%
Flights flown
388
Months covered
12

Keep nerding

Based on 402 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.