Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 1577 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1577 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

78%
Arrive within 15 minutes
9 min
Average arrival delay
1.2%
Cancelled
4 min early
Median arrival delay

Based on 682 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(97 flights)
  • Tue76%(91 flights)
  • Wed79%(95 flights)
  • Thu77%(99 flights)
  • Fri78%(101 flights)
  • Sat87%(89 flights)
  • Sun74%(101 flights)
On-time by departure window
  • 9 AM–12 PM88%(66 flights)
  • 12–3 PM77%(393 flights)
  • 6–9 PM77%(145 flights)
  • 9 PM–12 AM74%(69 flights)
On-time trend by month
77%
May

Jun 88% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%72
July 202576%29
August 202571%59
September 202572%36
October 202576%55
November 202572%29
December 202571%31
January 202684%57
February 202683%66
March 202679%85
April 202673%64
May 202677%90
Departures on time
80%
Diverted
0.1%
Flights flown
673
Months covered
12

Keep nerding

Based on 682 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.