Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 1663 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1663 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

78%
Arrive within 15 minutes
10 min
Average arrival delay
1.5%
Cancelled
4 min early
Median arrival delay

Based on 411 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon76%(59 flights)
  • Tue92%(59 flights)
  • Wed80%(59 flights)
  • Thu75%(56 flights)
  • Fri71%(58 flights)
  • Sat79%(57 flights)
  • Sun73%(56 flights)
On-time by departure window
  • 6–9 AM92%(36 flights)
  • 9 AM–12 PM87%(23 flights)
  • 12–3 PM52%(23 flights)
  • 3–6 PM—(5 flights)
  • 6–9 PM78%(317 flights)
On-time trend by month
77%
May

Jun 58% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202558%52
July 202594%31
August 202570%30
September 202581%53
October 202574%31
November 202569%29
December 202594%31
January 202693%29
February 202682%27
March 202673%30
April 202683%30
May 202677%31
Departures on time
77%
Diverted
0.2%
Flights flown
404
Months covered
12

Keep nerding

Based on 411 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.