(UA) United Airlines 3991 On-Time Performance Rating

Date Range:

15-Nov-2025 to 15-Jan-2026

(CLE) Cleveland Hopkins International Airport

Cleveland, OH, US

(IAD) Washington Dulles International Airport

Dulles, VA, US

On-Time Performance Chart

(using rounded numbers)

On-Time

83%

Late

Very Late

Excessive

17%

Cancelled

Diverted

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed

Total Delays ( > 1 min )

Codeshares

Average Delay (min.)

29.333333333333332

Standard Deviation

33.5

Min

Max

UA 3991 On-Time Performance Details

Overall Rating

3.3 of 5

Average

Percentage On-Time 83%

Average Delay Time 29.333333333333332 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.3 shows that this flight has on-time performance characteristics better than 64% of all other flights in the FlightStats database.

On-Time Performance Rating

3.6 of 5

Good

Percentage On-Time 83%

This flight has an on-time performance of 83%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 73% of other flights.

Delay Performance

2.9 of 5

Average

Average Delay Time 29.333333333333332 min

This flight has an average delay of 29.333333333333332 minutes with a standard deviation of 33.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 58% of other flights.