(UA) United Airlines 4257 Flight Details
On time | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
29-Mar-2026
Scheduled
09:00
EDT
Estimated
09:00
EDT
Total Departure Delay: -
Flight Runway Times
29-Mar-2026
Scheduled
09:21
EDT
Actual
--
Runway Delay: -
Terminal
-
Gate
A4E
Craft Type
Embraer EMB-145XR
E45
Flight Time
Scheduled
1h 50m
Arrival
TYS
Knoxville McGhee Tyson Airport, TN, US
Flight Gate Times
29-Mar-2026
Scheduled
10:50
EDT
Estimated
10:50
EDT
Total Arrival Delay: -
Flight Runway Times
29-Mar-2026
Scheduled
10:46
EDT
Actual
--
Runway Delay: -
Terminal
-
Gate
-
Baggage Claim
-
Tail Number
N21154
Flight Time
Estimated
1h 50m
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
29 Mar
08:08
04:08
04:08
Equipment Adjustment
Tail Number changed from N12160 to N21154
28 Mar
23:50
19:50
19:50
Gate Adjustment
Departure Gate changed from A4E to A4B
28 Mar
23:50
19:50
19:50
Gate Adjustment
Departure Gate changed from A4B to A4E
28 Mar
17:45
13:45
13:45
Gate Adjustment
Departure Gate changed from A3A to A4E
28 Mar
17:38
13:38
13:38
Equipment Adjustment
Tail Number changed from N21154 to N12160
28 Mar
13:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed to Mar-29-2026 9:21 AM
Scheduled Runway Arrival changed to Mar-29-2026 10:46 AM
28 Mar
11:38
07:38
07:38
Gate Adjustment
Departure Gate changed from A6B to A3A
28 Mar
09:32
05:32
05:32
Equipment Adjustment
Tail Number changed from N13124 to N21154
28 Mar
05:50
01:50
01:50
Equipment Adjustment
Tail Number changed from N17146 to N13124
27 Mar
20:56
16:56
16:56
Gate Adjustment
Departure Gate changed to A6B
27 Mar
20:50
16:50
16:50
Time Adjustment
Estimated Gate Departure changed to Mar-29-2026 9:00 AM
Estimated Gate Arrival changed to Mar-29-2026 10:50 AM
Tail Number changed to N17146
Actual Equipment changed to E45
26 Mar
18:47
14:47
14:47
Record Created
26 Mar
18:47
14:47
14:47
Time Adjustment
Scheduled Gate Departure changed to Mar-29-2026 9:00 AM
Scheduled Gate Arrival changed to Mar-29-2026 10:50 AM
Scheduled Equipment changed to ERJ