(UA) United Airlines 4257 Flight Details
On time | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
06-Feb-2026
Scheduled
09:00
EST
Estimated
09:00
EST
Total Departure Delay: -
Flight Runway Times
06-Feb-2026
Scheduled
09:21
EST
Estimated
09:21
EST
Runway Delay: -
Terminal
-
Gate
A3A
Craft Type
Embraer EMB-145XR
E45
Flight Time
Scheduled
1h 57m
Arrival
TYS
Knoxville McGhee Tyson Airport, TN, US
Flight Gate Times
06-Feb-2026
Scheduled
10:57
EST
Estimated
10:57
EST
Total Arrival Delay: -
Flight Runway Times
06-Feb-2026
Scheduled
10:53
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
11
Baggage Claim
3
Tail Number
N21129
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
6 Feb
12:36
07:36
07:36
Time Adjustment
Estimated Runway Departure changed to Feb-06-2026 9:21 AM
6 Feb
09:50
04:50
04:50
Gate Adjustment
Arrival Gate changed to 11
Baggage changed to 3
6 Feb
06:57
01:57
01:57
Gate Adjustment
Departure Gate changed from A1C to A3A
6 Feb
04:26
23:26
23:26
Equipment Adjustment
Tail Number changed from N21144 to N21129
5 Feb
21:14
16:14
16:14
Gate Adjustment
Departure Gate changed from A1 to A1C
5 Feb
21:03
16:03
16:03
Gate Adjustment
Departure Gate changed from 1 to A1
Tail Number changed from N12201 to N21144
5 Feb
14:14
09:14
09:14
Gate Adjustment
Departure Gate changed from A1 to 1
5 Feb
14:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed from Feb-06-2026 9:14 AM to Feb-06-2026 9:21 AM
Scheduled Runway Arrival changed from Feb-06-2026 10:15 AM to Feb-06-2026 10:53 AM
5 Feb
14:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Feb-06-2026 9:14 AM
Scheduled Runway Arrival changed to Feb-06-2026 10:15 AM
5 Feb
13:51
08:51
08:51
Gate Adjustment
Departure Gate changed from A5B to A1
5 Feb
06:50
01:50
01:50
Gate Adjustment
Departure Gate changed to A5B
5 Feb
01:08
20:08
20:08
Time Adjustment
Estimated Gate Departure changed to Feb-06-2026 9:00 AM
Estimated Gate Arrival changed to Feb-06-2026 10:57 AM
Tail Number changed to N12201
Actual Equipment changed to E45
3 Feb
18:48
13:48
13:48
Record Created
3 Feb
18:48
13:48
13:48
Time Adjustment
Scheduled Gate Departure changed to Feb-06-2026 9:00 AM
Scheduled Gate Arrival changed to Feb-06-2026 10:57 AM
Scheduled Equipment changed to ERJ