(UA) United Airlines 4257 Flight Details
On time | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
19-Mar-2026
Scheduled
09:00
EDT
Estimated
09:00
EDT
Total Departure Delay: -
Flight Runway Times
19-Mar-2026
Scheduled
09:21
EDT
Actual
--
Runway Delay: -
Terminal
-
Gate
A5C
Craft Type
Embraer EMB-145XR
E45
Flight Time
Scheduled
1h 49m
Arrival
TYS
Knoxville McGhee Tyson Airport, TN, US
Flight Gate Times
19-Mar-2026
Scheduled
10:49
EDT
Estimated
10:49
EDT
Total Arrival Delay: -
Flight Runway Times
19-Mar-2026
Scheduled
10:45
EDT
Actual
--
Runway Delay: -
Terminal
-
Gate
-
Baggage Claim
-
Tail Number
N12163
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
18 Mar
23:32
19:32
19:32
Gate Adjustment
Departure Gate changed from A5 to A5C
18 Mar
18:44
14:44
14:44
Equipment Adjustment
Tail Number changed from N14188 to N12163
18 Mar
18:38
14:38
14:38
Gate Adjustment
Departure Gate changed from 5 to A5
Tail Number changed from N12136 to N14188
18 Mar
17:08
13:08
13:08
Gate Adjustment
Departure Gate changed from A5 to 5
18 Mar
16:56
12:56
12:56
Gate Adjustment
Departure Gate changed from A4E to A5
18 Mar
13:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed from Mar-19-2026 9:05 AM to Mar-19-2026 9:21 AM
Scheduled Runway Arrival changed from Mar-19-2026 10:09 AM to Mar-19-2026 10:45 AM
18 Mar
13:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Mar-19-2026 9:05 AM
Scheduled Runway Arrival changed to Mar-19-2026 10:09 AM
18 Mar
12:02
08:02
08:02
Gate Adjustment
Departure Gate changed from A6A to A4E
18 Mar
02:32
22:32
22:32
Equipment Adjustment
Tail Number changed from N14168 to N12136
18 Mar
02:26
22:26
22:26
Equipment Adjustment
Tail Number changed from N17159 to N14168
18 Mar
01:20
21:20
21:20
Gate Adjustment
Departure Gate changed to A6A
18 Mar
00:20
20:20
20:20
Equipment Adjustment
Tail Number changed from N12136 to N17159
17 Mar
18:45
14:45
14:45
Equipment Adjustment
Tail Number changed from N13202 to N12136
17 Mar
18:44
14:44
14:44
Time Adjustment
Estimated Gate Departure changed to Mar-19-2026 9:00 AM
Estimated Gate Arrival changed to Mar-19-2026 10:49 AM
Tail Number changed to N13202
Actual Equipment changed to E45
16 Mar
18:47
14:47
14:47
Record Created
16 Mar
18:47
14:47
14:47
Time Adjustment
Scheduled Gate Departure changed to Mar-19-2026 9:00 AM
Scheduled Gate Arrival changed to Mar-19-2026 10:49 AM
Scheduled Equipment changed to ERJ