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Flight Reliability

UA 556 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 556 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

88%
Arrive within 15 minutes
4 min early
Average arrival delay
1.2%
Cancelled
13 min early
Median arrival delay

Based on 347 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon90%(51 flights)
  • Tue86%(50 flights)
  • Wed88%(51 flights)
  • Thu92%(51 flights)
  • Fri83%(52 flights)
  • Sat83%(36 flights)
  • Sun89%(52 flights)
On-time by departure window
  • 6–9 AM92%(144 flights)
  • 9 AM–12 PM76%(54 flights)
  • 12–3 PM89%(123 flights)
  • 6–9 PM77%(22 flights)
On-time trend by month
92%
May

Jun 90% → May 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202594%31
August 202589%28
September 202592%26
October 2025100%27
November 202597%30
December 202594%31
January 202667%30
February 202685%26
March 202671%31
April 202682%27
May 202692%26
Departures on time
89%
Diverted
0%
Flights flown
343
Months covered
12

Keep nerding

Based on 347 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.