(UA) United Airlines 4591 On-Time Performance Rating

Date Range:

01-Aug-2026 to 30-Sep-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(ROA) Roanoke-Blacksburg Regional Airport

Roanoke, VA, US

On-Time Performance Chart

(using rounded numbers)

On-Time

63%

Late

Very Late

Excessive

38%

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

112.6

Standard Deviation

126.8

Min

Max

281

UA 4591 On-Time Performance Details

Overall Rating

0.5 of 5

Very Poor

Percentage On-Time 63%

Average Delay Time 112.6 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.5 shows that this flight has on-time performance characteristics better than 8% of all other flights in the FlightStats database.

On-Time Performance Rating

0.9 of 5

Poor

Percentage On-Time 63%

This flight has an on-time performance of 63%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 18% of other flights.

Delay Performance

0.0 of 5

Very Poor

Average Delay Time 112.6 min

This flight has an average delay of 112.6 minutes with a standard deviation of 126.8 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 0% of other flights.