(UA) United Airlines 4257 Flight Details
On time | Departed
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
29-Jan-2026
Scheduled
09:00
EST
Actual
08:53
EST
Total Departure Delay: -
Flight Runway Times
29-Jan-2026
Scheduled
09:21
EST
Actual
09:08
EST
Runway Delay: -
Terminal
-
Gate
A4F
Craft Type
Embraer EMB-145XR
E45
Flight Time
Scheduled
1h 57m
Arrival
TYS
Knoxville McGhee Tyson Airport, TN, US
Flight Gate Times
29-Jan-2026
Scheduled
10:57
EST
Estimated
10:42
EST
Total Arrival Delay: -
Flight Runway Times
29-Jan-2026
Scheduled
10:53
EST
Estimated
10:38
EST
Runway Delay: -
Terminal
-
Gate
11
Baggage Claim
3
Tail Number
N21144
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
29 Jan
14:15
09:15
09:15
Time Adjustment
Estimated Runway Departure changed from Jan-29-2026 9:07 AM to Jan-29-2026 9:08 AM
Actual Runway Departure changed from Jan-29-2026 9:07 AM to Jan-29-2026 9:08 AM
Estimated Runway Arrival changed from Jan-29-2026 10:23 AM to Jan-29-2026 10:38 AM
Estimated Gate Arrival changed from Jan-29-2026 10:27 AM to Jan-29-2026 10:42 AM
29 Jan
14:10
09:10
09:10
Time Adjustment
Estimated Runway Departure changed from Jan-29-2026 9:08 AM to Jan-29-2026 9:07 AM
Actual Runway Departure changed from Jan-29-2026 9:08 AM to Jan-29-2026 9:07 AM
29 Jan
14:09
09:09
09:09
Time Adjustment
Estimated Runway Departure changed from Jan-29-2026 9:13 AM to Jan-29-2026 9:08 AM
Actual Runway Departure changed to Jan-29-2026 9:08 AM
29 Jan
13:57
08:57
08:57
Time Adjustment
Estimated Runway Departure changed from Jan-29-2026 9:21 AM to Jan-29-2026 9:13 AM
Estimated Gate Arrival changed from Jan-29-2026 10:57 AM to Jan-29-2026 10:27 AM
Arrival Gate changed to 11
Baggage changed to 3
29 Jan
13:57
08:57
08:57
Status Active
Estimated Gate Departure changed from Jan-29-2026 9:00 AM to Jan-29-2026 8:53 AM
Actual Gate Departure changed to Jan-29-2026 8:53 AM
Status changed from Scheduled to Active
29 Jan
13:55
08:55
08:55
Time Adjustment
Estimated Runway Arrival changed to Jan-29-2026 10:53 AM
29 Jan
13:55
08:55
08:55
Time Adjustment
Estimated Runway Arrival changed from Jan-29-2026 10:53 AM to Jan-29-2026 10:23 AM
29 Jan
12:41
07:41
07:41
Time Adjustment
Estimated Runway Departure changed to Jan-29-2026 9:21 AM
29 Jan
10:45
05:45
05:45
Gate Adjustment
Departure Gate changed from A4E to A4F
29 Jan
07:08
02:08
02:08
Gate Adjustment
Departure Gate changed from 5 to A4E
29 Jan
05:47
00:47
00:47
Gate Adjustment
Departure Gate changed from A5 to 5
29 Jan
05:27
00:27
00:27
Gate Adjustment
Departure Gate changed from A4E to A6B
29 Jan
05:27
00:27
00:27
Gate Adjustment
Departure Gate changed from A6B to A5
28 Jan
22:56
17:56
17:56
Gate Adjustment
Departure Gate changed from A3A to A4E
28 Jan
14:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed from Jan-29-2026 9:06 AM to Jan-29-2026 9:21 AM
Scheduled Runway Arrival changed from Jan-29-2026 10:13 AM to Jan-29-2026 10:53 AM
28 Jan
14:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Jan-29-2026 9:06 AM
Scheduled Runway Arrival changed to Jan-29-2026 10:13 AM
28 Jan
12:38
07:38
07:38
Gate Adjustment
Departure Gate changed to A3A
28 Jan
06:49
01:49
01:49
Time Adjustment
Estimated Gate Departure changed to Jan-29-2026 9:00 AM
Estimated Gate Arrival changed to Jan-29-2026 10:57 AM
Tail Number changed to N21144
Actual Equipment changed to E45
26 Jan
18:46
13:46
13:46
Record Created
26 Jan
18:46
13:46
13:46
Time Adjustment
Scheduled Gate Departure changed to Jan-29-2026 9:00 AM
Scheduled Gate Arrival changed to Jan-29-2026 10:57 AM
Scheduled Equipment changed to ERJ