Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 1236 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1236 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

72%
Arrive within 15 minutes
14 min
Average arrival delay
1.0%
Cancelled
3 min early
Median arrival delay

Based on 501 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon66%(76 flights)
  • Tue73%(44 flights)
  • Wed73%(80 flights)
  • Thu70%(84 flights)
  • Fri69%(80 flights)
  • Sat84%(43 flights)
  • Sun75%(84 flights)
On-time by departure window
  • 9 AM–12 PM84%(31 flights)
  • 12–3 PM—(3 flights)
  • 3–6 PM76%(115 flights)
  • 6–9 PM77%(178 flights)
  • 9 PM–12 AM61%(164 flights)
On-time trend by month
85%
May

Jun 63% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%54
July 202546%50
August 202550%38
September 202564%25
October 202584%37
November 202560%30
December 202577%57
January 202685%53
February 202680%45
March 202679%33
April 202691%43
May 202685%26
Departures on time
72%
Diverted
1.0%
Flights flown
491
Months covered
12

Keep nerding

Based on 501 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.