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Flight Reliability

UA 4637 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4637 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

76%
Arrive within 15 minutes
9 min
Average arrival delay
1.4%
Cancelled
4 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(51 flights)
  • Tue83%(52 flights)
  • Wed86%(51 flights)
  • Thu78%(51 flights)
  • Fri64%(52 flights)
  • Sat78%(51 flights)
  • Sun71%(52 flights)
On-time by departure window
  • 3–6 AM100%(22 flights)
  • 6–9 AM83%(100 flights)
  • 9 AM–12 PM73%(11 flights)
  • 12–3 PM70%(53 flights)
  • 3–6 PM73%(129 flights)
  • 6–9 PM69%(45 flights)
On-time trend by month
84%
May

Jun 50% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%28
July 202577%31
August 202558%31
September 202563%30
October 202577%31
November 202596%28
December 202574%31
January 202681%31
February 202686%28
March 202697%30
April 202673%30
May 202684%31
Departures on time
82%
Diverted
0%
Flights flown
360
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.