(UA) United Airlines 4257 Flight Details
On time | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
01-Mar-2026
Scheduled
09:00
EST
Estimated
09:00
EST
Total Departure Delay: -
Flight Runway Times
01-Mar-2026
Scheduled
09:21
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
A3A
Craft Type
Embraer EMB-145XR
E45
Flight Time
Scheduled
1h 49m
Arrival
TYS
Knoxville McGhee Tyson Airport, TN, US
Flight Gate Times
01-Mar-2026
Scheduled
10:49
EST
Estimated
10:49
EST
Total Arrival Delay: -
Flight Runway Times
01-Mar-2026
Scheduled
10:45
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
-
Baggage Claim
-
Tail Number
N21129
Flight Time
Estimated
1h 49m
Flight Notes
Operated by CommuteAir on behalf of United Airlines
Also marketed as (AC) Air Canada 4741, (AV) Avianca 2346, (CM) Copa Airlines 2237
Event Timeline
Date
Event
Data Updated
1 Mar
06:50
01:50
01:50
Equipment Adjustment
Tail Number changed from N14179 to N21129
28 Feb
15:02
10:02
10:02
Gate Adjustment
Departure Gate changed from A4E to A3A
28 Feb
14:50
09:50
09:50
Equipment Adjustment
Tail Number changed from N14186 to N14179
28 Feb
14:07
09:07
09:07
Time Adjustment
Scheduled Runway Departure changed from Mar-01-2026 9:09 AM to Mar-01-2026 9:21 AM
Scheduled Runway Arrival changed from Mar-01-2026 10:12 AM to Mar-01-2026 10:45 AM
28 Feb
14:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Mar-01-2026 9:09 AM
Scheduled Runway Arrival changed to Mar-01-2026 10:12 AM
28 Feb
12:26
07:26
07:26
Gate Adjustment
Departure Gate changed from A4C to A4E
28 Feb
12:20
07:20
07:20
Gate Adjustment
Departure Gate changed from A4B to A4C
28 Feb
12:20
07:20
07:20
Gate Adjustment
Departure Gate changed from A4C to A4B
28 Feb
12:15
07:15
07:15
Gate Adjustment
Departure Gate changed to A4C
28 Feb
06:50
01:50
01:50
Time Adjustment
Estimated Gate Departure changed to Mar-01-2026 9:00 AM
Estimated Gate Arrival changed to Mar-01-2026 10:49 AM
Tail Number changed to N14186
Actual Equipment changed to E45
26 Feb
18:48
13:48
13:48
Record Created
26 Feb
18:48
13:48
13:48
Time Adjustment
Scheduled Gate Departure changed to Mar-01-2026 9:00 AM
Scheduled Gate Arrival changed to Mar-01-2026 10:49 AM
Scheduled Equipment changed to ERJ