(UA) United Airlines 4257 Flight Details
Delayed by 1h | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
01-Feb-2026
Scheduled
09:00
EST
Estimated
10:00
EST
Total Departure Delay: 1 h
Flight Runway Times
01-Feb-2026
Scheduled
10:21
EST
Actual
--
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
01-Feb-2026
Scheduled
10:57
EST
Estimated
11:57
EST
Total Arrival Delay: 1 h
Flight Runway Times
01-Feb-2026
Scheduled
11:53
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
-
Baggage Claim
-
Tail Number
N12145
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
1 Feb
01:50
20:50
20:50
Time Adjustment
Estimated Gate Departure changed from Feb-01-2026 9:00 AM to Feb-01-2026 10:00 AM
Estimated Gate Arrival changed from Feb-01-2026 10:57 AM to Feb-01-2026 11:57 AM
1 Feb
01:13
20:13
20:13
Time Adjustment
Scheduled Runway Departure changed from Feb-01-2026 9:21 AM to Feb-01-2026 10:21 AM
Scheduled Runway Arrival changed from Feb-01-2026 10:53 AM to Feb-01-2026 11:53 AM
31 Jan
22:50
17:50
17:50
Gate Adjustment
Departure Gate changed from A2E to A4F
31 Jan
14:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed from Feb-01-2026 9:15 AM to Feb-01-2026 9:21 AM
Scheduled Runway Arrival changed from Feb-01-2026 10:22 AM to Feb-01-2026 10:53 AM
31 Jan
14:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Feb-01-2026 9:15 AM
Scheduled Runway Arrival changed to Feb-01-2026 10:22 AM
31 Jan
12:38
07:38
07:38
Gate Adjustment
Departure Gate changed to A2E
30 Jan
21:09
16:09
16:09
Equipment Adjustment
Tail Number changed from N21129 to N12145
30 Jan
06:51
01:51
01:51
Time Adjustment
Estimated Gate Departure changed to Feb-01-2026 9:00 AM
Estimated Gate Arrival changed to Feb-01-2026 10:57 AM
Tail Number changed to N21129
Actual Equipment changed to E45
29 Jan
18:46
13:46
13:46
Record Created
29 Jan
18:46
13:46
13:46
Time Adjustment
Scheduled Gate Departure changed to Feb-01-2026 9:00 AM
Scheduled Gate Arrival changed to Feb-01-2026 10:57 AM
Scheduled Equipment changed to ERJ