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(UA) United Airlines 3551 On-Time Performance Rating

Date Range:

15-Jun-2026 to 15-Aug-2026

(IAD) Washington Dulles International Airport

Dulles, VA, US

(BOS) Boston Logan International Airport

Boston, MA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
8
80%
Late
2
20%
Very Late
0
0%
Excessive
0
0%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
10
Total Delays ( > 1 min )
2
Codeshares
10
Average Delay (min.)
21.5
Standard Deviation
3.5
Min
0
Max
24

UA 3551 On-Time Performance Details

Overall Rating
3.5 of 5
Average
Percentage On-Time 80%
Average Delay Time 21.5 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 3.5 shows that this flight has on-time performance characteristics better than 68% of all other flights in the FlightStats database.
On-Time Performance Rating
3.6 of 5
Good
Percentage On-Time 80%
This flight has an on-time performance of 80%. 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
3.3 of 5
Average
Average Delay Time 21.5 min
This flight has an average delay of 21.5 minutes with a standard deviation of 3.5 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 66% of other flights.

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