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Flight Reliability

UA 635 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 635 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

89%
Arrive within 15 minutes
2 min early
Average arrival delay
1.4%
Cancelled
9 min early
Median arrival delay

Based on 494 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon84%(76 flights)
  • Tue91%(70 flights)
  • Wed100%(56 flights)
  • Thu87%(69 flights)
  • Fri87%(76 flights)
  • Sat93%(72 flights)
  • Sun85%(67 flights)
On-time by departure window
  • 6–9 AM94%(326 flights)
  • 9 AM–12 PM87%(113 flights)
  • 12–3 PM80%(25 flights)
  • 3–6 PM—(7 flights)
  • 6–9 PM53%(15 flights)
On-time trend by month
83%
May

Jun 100% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%23
July 202553%15
August 202595%38
September 202588%50
October 202594%31
November 202597%30
December 202590%30
January 202686%29
February 202691%42
March 202691%56
April 202694%53
May 202683%89
Departures on time
91%
Diverted
0.2%
Flights flown
486
Months covered
12

Keep nerding

Based on 494 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.