Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 1640 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1640 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

86%
Arrive within 15 minutes
5 min early
Average arrival delay
0.8%
Cancelled
11 min early
Median arrival delay

Based on 366 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon90%(49 flights)
  • Tue87%(52 flights)
  • Wed84%(50 flights)
  • Thu86%(55 flights)
  • Fri79%(48 flights)
  • Sat85%(52 flights)
  • Sun89%(56 flights)
On-time by departure window
  • 6–9 AM83%(12 flights)
  • 9 AM–12 PM80%(148 flights)
  • 3–6 PM86%(21 flights)
  • 6–9 PM88%(140 flights)
  • 9 PM–12 AM100%(41 flights)
On-time trend by month
87%
May

Jun 87% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202584%31
August 202593%30
September 2025100%29
October 202582%34
November 202569%29
December 202577%30
January 202674%31
February 202685%27
March 2026100%30
April 202690%30
May 202687%31
Departures on time
84%
Diverted
0.3%
Flights flown
362
Months covered
12

Keep nerding

Based on 366 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.