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Flight Reliability

UA 3638 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 3638 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

82%
Arrive within 15 minutes
2 min early
Average arrival delay
2.7%
Cancelled
14 min early
Median arrival delay

Based on 339 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(49 flights)
  • Tue85%(46 flights)
  • Wed83%(47 flights)
  • Thu86%(50 flights)
  • Fri81%(47 flights)
  • Sat80%(45 flights)
  • Sun80%(45 flights)
On-time by departure window
  • 6–9 AM90%(83 flights)
  • 9 AM–12 PM88%(170 flights)
  • 12–3 PM75%(20 flights)
  • 3–6 PM50%(22 flights)
  • 6–9 PM50%(10 flights)
  • 9 PM–12 AM67%(24 flights)
On-time trend by month
100%
May

Jun 60% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%25
July 202593%28
August 202574%31
September 202593%30
October 202571%31
November 202569%26
December 202573%15
January 202681%26
February 202696%26
March 202674%31
April 202697%30
May 2026100%30
Departures on time
88%
Diverted
0.3%
Flights flown
329
Months covered
12

Keep nerding

Based on 339 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.