(UA) United Airlines 4257 Flight Details
On time | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
13-Jan-2026
Scheduled
09:00
EST
Estimated
09:00
EST
Total Departure Delay: -
Flight Runway Times
13-Jan-2026
Scheduled
09:21
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
A5B
Craft Type
Embraer EMB-145XR
E45
Flight Time
Scheduled
1h 57m
Arrival
TYS
Knoxville McGhee Tyson Airport, TN, US
Flight Gate Times
13-Jan-2026
Scheduled
10:57
EST
Estimated
10:57
EST
Total Arrival Delay: -
Flight Runway Times
13-Jan-2026
Scheduled
10:53
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
11
Baggage Claim
-
Tail Number
N14143
Flight Time
Estimated
1h 57m
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
13 Jan
10:43
05:43
05:43
Gate Adjustment
Departure Gate changed from A1 to A5B
13 Jan
10:37
05:37
05:37
Gate Adjustment
Departure Gate changed from 1 to A1
Tail Number changed from N14186 to N14143
13 Jan
06:11
01:11
01:11
Gate Adjustment
Departure Gate changed from A1 to 1
13 Jan
05:49
00:49
00:49
Gate Adjustment
Departure Gate changed from A4F to A1
13 Jan
04:01
23:01
23:01
Equipment Adjustment
Tail Number changed from N14143 to N14186
13 Jan
03:19
22:19
22:19
Gate Adjustment
Arrival Gate changed to 11
12 Jan
22:37
17:37
17:37
Gate Adjustment
Departure Gate changed from A6A to A4F
12 Jan
22:37
17:37
17:37
Equipment Adjustment
Tail Number changed from N12145 to N14143
12 Jan
22:37
17:37
17:37
Gate Adjustment
Departure Gate changed from A2E to A6A
12 Jan
14:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed from Jan-13-2026 9:09 AM to Jan-13-2026 9:21 AM
Scheduled Runway Arrival changed from Jan-13-2026 10:14 AM to Jan-13-2026 10:53 AM
12 Jan
14:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Jan-13-2026 9:09 AM
Scheduled Runway Arrival changed to Jan-13-2026 10:14 AM
12 Jan
12:25
07:25
07:25
Gate Adjustment
Departure Gate changed to A2E
12 Jan
02:19
21:19
21:19
Equipment Adjustment
Tail Number changed from N14153 to N12145
12 Jan
02:07
21:07
21:07
Time Adjustment
Estimated Gate Departure changed to Jan-13-2026 9:00 AM
Estimated Gate Arrival changed to Jan-13-2026 10:57 AM
Tail Number changed to N14153
Actual Equipment changed to E45
10 Jan
18:42
13:42
13:42
Record Created
10 Jan
18:42
13:42
13:42
Time Adjustment
Scheduled Gate Departure changed to Jan-13-2026 9:00 AM
Scheduled Gate Arrival changed to Jan-13-2026 10:57 AM
Scheduled Equipment changed to ERJ