(UA) United Airlines 4257 Flight Details
On time | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
01-Jan-2026
Scheduled
09:00
EST
Estimated
09:00
EST
Total Departure Delay: -
Flight Runway Times
01-Jan-2026
Scheduled
09:21
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
A4B
Craft Type
Embraer EMB-145XR
E45
Flight Time
Scheduled
1h 56m
Arrival
TYS
Knoxville McGhee Tyson Airport, TN, US
Flight Gate Times
01-Jan-2026
Scheduled
10:56
EST
Estimated
10:56
EST
Total Arrival Delay: -
Flight Runway Times
01-Jan-2026
Scheduled
10:52
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
-
Baggage Claim
-
Tail Number
N12142
Flight Time
Estimated
1h 56m
Flight Notes
Operated by CommuteAir on behalf of United Airlines
Also marketed as (AC) Air Canada 4741, (CM) Copa Airlines 2237
Event Timeline
Date
Event
Data Updated
1 Jan
07:31
02:31
02:31
Gate Adjustment
Departure Gate changed from A1C to A4B
1 Jan
06:49
01:49
01:49
Equipment Adjustment
Tail Number changed from N14198 to N12142
31 Dec
22:37
17:37
17:37
Gate Adjustment
Departure Gate changed from A4A to A1C
31 Dec
20:25
15:25
15:25
Gate Adjustment
Departure Gate changed from 5 to A4A
31 Dec
19:55
14:55
14:55
Gate Adjustment
Departure Gate changed from A5 to 5
31 Dec
19:49
14:49
14:49
Gate Adjustment
Departure Gate changed from 1 to A5
31 Dec
14:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed from Jan-01-2026 9:11 AM to Jan-01-2026 9:21 AM
Scheduled Runway Arrival changed from Jan-01-2026 10:14 AM to Jan-01-2026 10:52 AM
31 Dec
14:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Jan-01-2026 9:11 AM
Scheduled Runway Arrival changed to Jan-01-2026 10:14 AM
31 Dec
12:01
07:01
07:01
Gate Adjustment
Departure Gate changed from A1 to 1
31 Dec
11:55
06:55
06:55
Gate Adjustment
Departure Gate changed from A4C to A1
31 Dec
11:55
06:55
06:55
Equipment Adjustment
Tail Number changed from N17138 to N14198
31 Dec
06:49
01:49
01:49
Gate Adjustment
Departure Gate changed to A4C
30 Dec
23:13
18:13
18:13
Time Adjustment
Estimated Gate Departure changed to Jan-01-2026 9:00 AM
Estimated Gate Arrival changed to Jan-01-2026 10:56 AM
Tail Number changed to N17138
Actual Equipment changed to E45
29 Dec
18:45
13:45
13:45
Record Created
29 Dec
18:45
13:45
13:45
Time Adjustment
Scheduled Gate Departure changed to Jan-01-2026 9:00 AM
Scheduled Gate Arrival changed to Jan-01-2026 10:56 AM
Scheduled Equipment changed to ERJ