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Flight Reliability

UA 520 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 520 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

73%
Arrive within 15 minutes
11 min
Average arrival delay
0.7%
Cancelled
3 min early
Median arrival delay

Based on 425 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(59 flights)
  • Tue71%(61 flights)
  • Wed82%(60 flights)
  • Thu76%(59 flights)
  • Fri75%(59 flights)
  • Sat79%(62 flights)
  • Sun65%(62 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM75%(52 flights)
  • 9 AM–12 PM81%(75 flights)
  • 12–3 PM74%(86 flights)
  • 3–6 PM81%(90 flights)
  • 6–9 PM50%(82 flights)
  • 9 PM–12 AM83%(36 flights)
On-time trend by month
48%
May

Jun 45% → May 48% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202545%29
July 202555%31
August 202573%30
September 202596%24
November 202593%30
December 202571%31
January 202683%83
February 202676%54
March 202678%32
April 202687%30
May 202648%42
Departures on time
79%
Diverted
0%
Flights flown
422
Months covered
12

Keep nerding

Based on 425 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.