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Flight Reliability

UA 4633 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4633 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
8 min
Average arrival delay
1.6%
Cancelled
6 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(49 flights)
  • Tue77%(52 flights)
  • Wed84%(51 flights)
  • Thu84%(51 flights)
  • Fri82%(51 flights)
  • Sat83%(52 flights)
  • Sun75%(52 flights)
On-time by departure window
  • 3–6 AM91%(44 flights)
  • 9 AM–12 PM—(8 flights)
  • 12–3 PM91%(121 flights)
  • 3–6 PM61%(61 flights)
  • 6–9 PM80%(123 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
55%
May

Jun 82% → May 55% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%28
July 202577%30
August 202571%31
September 202583%30
October 202594%31
November 202593%30
December 202594%31
January 202681%31
February 202686%28
March 202669%29
April 202683%30
May 202655%29
Departures on time
81%
Diverted
0.3%
Flights flown
358
Months covered
12

Keep nerding

Based on 365 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.