(UA) United Airlines 4257 Flight Details
On time | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
14-Mar-2026
Scheduled
09:00
EDT
Estimated
09:00
EDT
Total Departure Delay: -
Flight Runway Times
14-Mar-2026
Scheduled
09:21
EDT
Actual
--
Runway Delay: -
Terminal
-
Gate
A5B
Craft Type
Embraer EMB-145XR
E45
Flight Time
Scheduled
1h 49m
Arrival
TYS
Knoxville McGhee Tyson Airport, TN, US
Flight Gate Times
14-Mar-2026
Scheduled
10:49
EDT
Estimated
10:49
EDT
Total Arrival Delay: -
Flight Runway Times
14-Mar-2026
Scheduled
10:45
EDT
Actual
--
Runway Delay: -
Terminal
-
Gate
-
Baggage Claim
-
Tail Number
N12145
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
13 Mar
23:38
19:38
19:38
Gate Adjustment
Departure Gate changed from A5A to A5B
13 Mar
17:26
13:26
13:26
Gate Adjustment
Departure Gate changed from A5B to A5A
13 Mar
15:14
11:14
11:14
Gate Adjustment
Departure Gate changed from A4F to A5B
13 Mar
15:02
11:02
11:02
Equipment Adjustment
Tail Number changed from N16183 to N12145
13 Mar
13:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed from Mar-14-2026 9:06 AM to Mar-14-2026 9:21 AM
Scheduled Runway Arrival changed from Mar-14-2026 10:11 AM to Mar-14-2026 10:45 AM
13 Mar
13:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Mar-14-2026 9:06 AM
Scheduled Runway Arrival changed to Mar-14-2026 10:11 AM
13 Mar
11:39
07:39
07:39
Gate Adjustment
Departure Gate changed from A3A to A4F
13 Mar
00:02
20:02
20:02
Equipment Adjustment
Tail Number changed from N12167 to N16183
12 Mar
23:56
19:56
19:56
Equipment Adjustment
Tail Number changed from N21154 to N12167
12 Mar
23:56
19:56
19:56
Gate Adjustment
Departure Gate changed to A3A
12 Mar
05:50
01:50
01:50
Time Adjustment
Estimated Gate Departure changed to Mar-14-2026 9:00 AM
Estimated Gate Arrival changed to Mar-14-2026 10:49 AM
Tail Number changed to N21154
Actual Equipment changed to E45
11 Mar
18:45
14:45
14:45
Record Created
11 Mar
18:45
14:45
14:45
Time Adjustment
Scheduled Gate Departure changed to Mar-14-2026 9:00 AM
Scheduled Gate Arrival changed to Mar-14-2026 10:49 AM
Scheduled Equipment changed to ERJ