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Flight Reliability

UA 1238 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1238 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
11 min
Average arrival delay
0.9%
Cancelled
6 min early
Median arrival delay

Based on 464 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(69 flights)
  • Tue77%(64 flights)
  • Wed80%(66 flights)
  • Thu79%(65 flights)
  • Fri85%(68 flights)
  • Sat76%(58 flights)
  • Sun61%(69 flights)
On-time by departure window
  • 6–9 AM91%(88 flights)
  • 9 AM–12 PM81%(142 flights)
  • 12–3 PM84%(37 flights)
  • 3–6 PM63%(84 flights)
  • 6–9 PM66%(56 flights)
  • 9 PM–12 AM77%(52 flights)
On-time trend by month
97%
May

Jun 45% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202545%53
July 202584%31
August 202584%49
September 202591%35
October 202579%52
November 202579%24
December 202564%45
January 202689%35
February 202678%41
March 202682%33
April 202680%30
May 202697%31
Departures on time
77%
Diverted
0.2%
Flights flown
459
Months covered
12

Keep nerding

Based on 464 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.