(UA) United Airlines 4520 On-Time Performance Rating

Date Range:

15-Aug-2026 to 15-Oct-2026

(MHT) Manchester-Boston Regional Airport

Manchester, NH, US

(IAD) Washington Dulles International Airport

Dulles, VA, US

On-Time Performance Chart

(using rounded numbers)

On-Time

55%

Late

Very Late

18%

Excessive

27%

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

60.888888888888886

Standard Deviation

78.4

Min

Max

247

UA 4520 On-Time Performance Details

Overall Rating

0.3 of 5

Very Poor

Percentage On-Time 55%

Average Delay Time 60.888888888888886 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.3 shows that this flight has on-time performance characteristics better than 4% of all other flights in the FlightStats database.

On-Time Performance Rating

0.2 of 5

Very Poor

Percentage On-Time 55%

This flight has an on-time performance of 55%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 4% of other flights.

Delay Performance

0.3 of 5

Very Poor

Average Delay Time 60.888888888888886 min

This flight has an average delay of 60.888888888888886 minutes with a standard deviation of 78.4 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 5% of other flights.