(UA) United Airlines 1236 On-Time Performance Rating

Date Range:

15-Dec-2025 to 15-Feb-2026

(STL) St Louis Lambert International Airport

Saint Louis, MO, US

(DEN) Denver International Airport

Denver, CO, US

On-Time Performance Chart

(using rounded numbers)

On-Time

76%

Late

Very Late

Excessive

24%

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

99.71428571428571

Standard Deviation

124.3

Min

Max

298

UA 1236 On-Time Performance Details

Overall Rating

1.5 of 5

Poor

Percentage On-Time 77%

Average Delay Time 99.71428571428571 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 1.5 shows that this flight has on-time performance characteristics better than 28% of all other flights in the FlightStats database.

On-Time Performance Rating

2.9 of 5

Average

Percentage On-Time 77%

This flight has an on-time performance of 77%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 58% of other flights.

Delay Performance

0.0 of 5

Very Poor

Average Delay Time 99.71428571428571 min

This flight has an average delay of 99.71428571428571 minutes with a standard deviation of 124.3 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 0% of other flights.