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Flight Reliability

UA 5551 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5551 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

74%
Arrive within 15 minutes
9 min
Average arrival delay
1.8%
Cancelled
4 min early
Median arrival delay

Based on 333 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(52 flights)
  • Tue68%(38 flights)
  • Wed85%(48 flights)
  • Thu77%(51 flights)
  • Fri72%(50 flights)
  • Sat82%(33 flights)
  • Sun69%(51 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM90%(48 flights)
  • 12–3 PM76%(54 flights)
  • 3–6 PM70%(201 flights)
  • 6–9 PM74%(19 flights)
On-time trend by month
87%
May

Jun 36% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202536%28
July 202584%31
August 202556%27
September 202581%21
October 202575%24
November 202596%27
December 202567%30
January 202660%25
February 202682%27
March 202687%23
April 202683%30
May 202687%30
Departures on time
78%
Diverted
1.2%
Flights flown
323
Months covered
12

Keep nerding

Based on 333 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.