(UA) United Airlines 551 On-Time Performance Rating

Date Range:

01-Jan-2026 to 28-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

86%

Late

Very Late

Excessive

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

18.5

Standard Deviation

23.8

Min

Max

UA 551 On-Time Performance Details

Overall Rating

4.2 of 5

Good

Percentage On-Time 86%

Average Delay Time 18.5 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 4.2 shows that this flight has on-time performance characteristics better than 83% of all other flights in the FlightStats database.

On-Time Performance Rating

4.5 of 5

Good

Percentage On-Time 86%

This flight has an on-time performance of 86%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 90% of other flights.

Delay Performance

3.9 of 5

Good

Average Delay Time 18.5 min

This flight has an average delay of 18.5 minutes with a standard deviation of 23.8 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 79% of other flights.