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Flight Reliability

UA 277 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 277 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
1 min
Average arrival delay
0.9%
Cancelled
7 min early
Median arrival delay

Based on 583 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon89%(85 flights)
  • Tue92%(78 flights)
  • Wed89%(85 flights)
  • Thu86%(83 flights)
  • Fri86%(85 flights)
  • Sat88%(73 flights)
  • Sun86%(88 flights)
On-time by departure window
  • 6–9 AM89%(126 flights)
  • 9 AM–12 PM89%(220 flights)
  • 3–6 PM87%(231 flights)
On-time trend by month
90%
May

Jun 97% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%57
July 202588%58
August 202589%45
September 202583%30
October 202575%36
November 202585%58
December 202594%64
January 2026100%31
February 202682%28
March 202675%52
April 202693%56
May 202690%62
Departures on time
89%
Diverted
0.2%
Flights flown
577
Months covered
12

Keep nerding

Based on 583 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.