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(UA) United Airlines 4390 On-Time Performance Rating

Date Range:

01-Sep-2026 to 31-Oct-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(PWM) Portland International Jetport

Portland, ME, US

On-Time Performance Chart

(using rounded numbers)
On-Time
8
100%
Late
0
0%
Very Late
0
0%
Excessive
0
0%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
8
Total Delays ( > 1 min )
3
Codeshares
8
Average Delay (min.)
5
Standard Deviation
2.6
Min
0
Max
7

UA 4390 On-Time Performance Details

Overall Rating
4.4 of 5
Good
Percentage On-Time 100%
Average Delay Time 5 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 4.4 shows that this flight has on-time performance characteristics better than 87% of all other flights in the FlightStats database.
On-Time Performance Rating
4.7 of 5
Very Good
Percentage On-Time 100%
This flight has an on-time performance of 100%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 95% of other flights.
Delay Performance
4.1 of 5
Good
Average Delay Time 5 min
This flight has an average delay of 5 minutes with a standard deviation of 2.6 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 82% of other flights.

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