Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 661 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 661 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
20 min
Average arrival delay
1.0%
Cancelled
4 min
Median arrival delay

Based on 777 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(116 flights)
  • Tue71%(108 flights)
  • Wed67%(106 flights)
  • Thu63%(115 flights)
  • Fri64%(117 flights)
  • Sat69%(102 flights)
  • Sun63%(102 flights)
On-time by departure window
  • 6–9 AM93%(134 flights)
  • 12–3 PM71%(58 flights)
  • 3–6 PM52%(306 flights)
  • 6–9 PM67%(170 flights)
  • 9 PM–12 AM68%(98 flights)
On-time trend by month
78%
May

Jun 61% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202561%79
July 202594%31
August 202572%57
September 202573%60
October 202563%64
November 202554%57
December 202559%76
January 202662%53
February 202670%57
March 202658%81
April 202666%84
May 202678%67
Departures on time
73%
Diverted
0.4%
Flights flown
766
Months covered
12

Keep nerding

Based on 777 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.