(UA) United Airlines 4563 On-Time Performance Rating

Date Range:

01-Aug-2026 to 30-Sep-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(GSP) Greenville-Spartanburg International Airport

Greenville, SC, US

On-Time Performance Chart

(using rounded numbers)

On-Time

92%

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.)

173

Standard Deviation

Min

Max

173

UA 4563 On-Time Performance Details

Overall Rating

2.4 of 5

Average

Percentage On-Time 92%

Average Delay Time 173 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 2.4 shows that this flight has on-time performance characteristics better than 46% of all other flights in the FlightStats database.

On-Time Performance Rating

4.7 of 5

Very Good

Percentage On-Time 92%

This flight has an on-time performance of 92%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 93% of other flights.

Delay Performance

0.0 of 5

Very Poor

Average Delay Time 173 min

This flight has an average delay of 173 minutes with a standard deviation of 0 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 1% of other flights.