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Flight Reliability

UA 4777 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4777 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

89%
Arrive within 15 minutes
5 min
Average arrival delay
1.1%
Cancelled
12 min early
Median arrival delay

Based on 355 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon82%(51 flights)
  • Tue96%(52 flights)
  • Wed94%(51 flights)
  • Thu84%(50 flights)
  • Fri96%(50 flights)
  • Sat84%(45 flights)
  • Sun88%(51 flights)
On-time by departure window
  • 3–6 AM90%(209 flights)
  • 6–9 AM89%(18 flights)
  • 9 AM–12 PM90%(69 flights)
  • 6–9 PM85%(54 flights)
On-time trend by month
94%
May

Jun 86% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%28
July 202585%26
August 202594%31
September 202587%30
October 202590%31
November 202597%29
December 202577%31
January 202684%31
February 202692%25
March 202689%27
April 2026100%30
May 202694%31
Departures on time
92%
Diverted
0.3%
Flights flown
350
Months covered
12

Keep nerding

Based on 355 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.