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Flight Reliability

UA 646 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 646 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

84%
Arrive within 15 minutes
2 min early
Average arrival delay
0.3%
Cancelled
10 min early
Median arrival delay

Based on 287 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(43 flights)
  • Tue95%(38 flights)
  • Wed86%(43 flights)
  • Thu76%(42 flights)
  • Fri83%(42 flights)
  • Sat86%(35 flights)
  • Sun81%(43 flights)
On-time by departure window
  • 6–9 AM95%(37 flights)
  • 9 AM–12 PM96%(53 flights)
  • 12–3 PM86%(77 flights)
  • 3–6 PM71%(104 flights)
  • 6–9 PM93%(15 flights)
On-time trend by month
95%
May

Aug 85% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202585%13
September 202580%30
October 202578%37
November 202586%59
January 202658%26
February 202683%36
March 202694%33
April 202697%30
May 202695%20
Departures on time
87%
Diverted
0%
Flights flown
286
Months covered
10

Keep nerding

Based on 287 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.