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Flight Reliability

UA 3633 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 3633 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

87%
Arrive within 15 minutes
5 min early
Average arrival delay
4.3%
Cancelled
15 min early
Median arrival delay

Based on 325 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon91%(43 flights)
  • Tue83%(46 flights)
  • Wed91%(45 flights)
  • Thu89%(45 flights)
  • Fri82%(45 flights)
  • Sat88%(42 flights)
  • Sun82%(44 flights)
On-time by departure window
  • 6–9 AM100%(42 flights)
  • 12–3 PM83%(86 flights)
  • 3–6 PM85%(167 flights)
  • 6–9 PM85%(13 flights)
  • 9 PM–12 AM—(2 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
August 202590%29
September 2025100%28
October 202570%30
November 202583%29
December 202562%26
January 202682%28
February 202692%25
March 202693%30
April 202691%32
May 2026100%28
Departures on time
87%
Diverted
0.3%
Flights flown
310
Months covered
11

Keep nerding

Based on 325 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.