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(UA) United Airlines 4427 On-Time Performance Rating

Date Range:

15-Aug-2025 to 15-Oct-2025

(IAD) Washington Dulles International Airport

Dulles, VA, US

(STL) St Louis Lambert International Airport

Saint Louis, MO, US

On-Time Performance Chart

(using rounded numbers)
On-Time
46
87%
Late
3
6%
Very Late
0
0%
Excessive
3
6%
Cancelled
0
0%
Diverted
1
2%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
52
Total Delays ( > 1 min )
9
Codeshares
52
Average Delay (min.)
51.22222222222222
Standard Deviation
70.2
Min
0
Max
208

UA 4427 On-Time Performance Details

Overall Rating
2.8 of 5
Average
Percentage On-Time 89%
Average Delay Time 51.22222222222222 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.8 shows that this flight has on-time performance characteristics better than 54% of all other flights in the FlightStats database.
On-Time Performance Rating
4.9 of 5
Very Good
Percentage On-Time 89%
This flight has an on-time performance of 89%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 98% of other flights.
Delay Performance
0.6 of 5
Poor
Average Delay Time 51.22222222222222 min
This flight has an average delay of 51.22222222222222 minutes with a standard deviation of 70.2 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 12% of other flights.

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