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Flight Reliability

UA 1557 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1557 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

66%
Arrive within 15 minutes
28 min
Average arrival delay
1.1%
Cancelled
2 min
Median arrival delay

Based on 451 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon68%(62 flights)
  • Tue69%(67 flights)
  • Wed64%(63 flights)
  • Thu68%(62 flights)
  • Fri66%(64 flights)
  • Sat65%(60 flights)
  • Sun61%(64 flights)
On-time by departure window
  • 6–9 AM83%(89 flights)
  • 9 AM–12 PM68%(110 flights)
  • 12–3 PM64%(52 flights)
  • 3–6 PM43%(106 flights)
  • 6–9 PM75%(84 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
72%
May

Jun 46% → May 72% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202546%26
July 202529%28
August 202538%29
September 202570%30
October 202584%37
November 202585%58
December 202568%31
January 202662%37
February 202674%50
March 202666%35
April 202658%31
May 202672%50
Departures on time
72%
Diverted
0.9%
Flights flown
442
Months covered
12

Keep nerding

Based on 451 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.