(UA) United Airlines 4603 On-Time Performance Rating

Date Range:

15-Apr-2026 to 15-Jun-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

86%

Late

Very Late

Excessive

14%

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

171.5

Standard Deviation

126.6

Min

Max

261

UA 4603 On-Time Performance Details

Overall Rating

1.9 of 5

Average

Percentage On-Time 86%

Average Delay Time 171.5 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 1.9 shows that this flight has on-time performance characteristics better than 37% of all other flights in the FlightStats database.

On-Time Performance Rating

3.8 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 76% of other flights.

Delay Performance

0.0 of 5

Very Poor

Average Delay Time 171.5 min

This flight has an average delay of 171.5 minutes with a standard deviation of 126.6 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 0% of other flights.