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Flight Reliability

UA 577 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 577 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

80%
Arrive within 15 minutes
10 min
Average arrival delay
2.6%
Cancelled
9 min early
Median arrival delay

Based on 425 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(61 flights)
  • Tue86%(63 flights)
  • Wed81%(57 flights)
  • Thu80%(64 flights)
  • Fri83%(64 flights)
  • Sat78%(50 flights)
  • Sun82%(54 flights)
On-time by departure window
  • 6–9 AM94%(120 flights)
  • 9 AM–12 PM80%(10 flights)
  • 12–3 PM77%(166 flights)
  • 3–6 PM69%(101 flights)
  • 6–9 PM—(8 flights)
  • 9 PM–12 AM—(8 flights)
On-time trend by month
93%
May

Jun 72% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%39
July 202576%53
August 202581%31
September 202557%28
October 202582%22
November 202574%27
December 202583%36
January 202691%55
February 202691%35
March 202677%30
April 202682%27
May 202693%30
Departures on time
81%
Diverted
0.2%
Flights flown
413
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.