(UA) United Airlines 3634 On-Time Performance Rating

Date Range:

15-Jan-2026 to 15-Mar-2026

(BUF) Buffalo Niagara International Airport

Buffalo, NY, US

(IAD) Washington Dulles International Airport

Dulles, VA, US

On-Time Performance Chart

(using rounded numbers)

On-Time

72%

Late

11%

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.)

116.44444444444444

Standard Deviation

173.3

Min

Max

488

UA 3634 On-Time Performance Details

Overall Rating

0.8 of 5

Poor

Percentage On-Time 72%

Average Delay Time 116.44444444444444 min

FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 0.8 shows that this flight has on-time performance characteristics better than 14% of all other flights in the FlightStats database.

On-Time Performance Rating

1.5 of 5

Poor

Percentage On-Time 72%

This flight has an on-time performance of 72%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 31% of other flights.

Delay Performance

0.0 of 5

Very Poor

Average Delay Time 116.44444444444444 min

This flight has an average delay of 116.44444444444444 minutes with a standard deviation of 173.3 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 0% of other flights.