(UA) United Airlines 4257 Flight Details
On time | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
22-Feb-2026
Scheduled
09:00
EST
Estimated
09:00
EST
Total Departure Delay: -
Flight Runway Times
22-Feb-2026
Scheduled
09:21
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
A2F
Craft Type
Embraer EMB-145XR
E45
Flight Time
Scheduled
1h 49m
Arrival
TYS
Knoxville McGhee Tyson Airport, TN, US
Flight Gate Times
22-Feb-2026
Scheduled
10:49
EST
Estimated
10:49
EST
Total Arrival Delay: -
Flight Runway Times
22-Feb-2026
Scheduled
10:45
EST
Actual
--
Runway Delay: -
Terminal
-
Gate
-
Baggage Claim
-
Tail Number
N21154
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
22 Feb
06:52
01:52
01:52
Gate Adjustment
Departure Gate changed from A5 to A2F
22 Feb
06:46
01:46
01:46
Equipment Adjustment
Tail Number changed from N17159 to N21154
21 Feb
23:03
18:03
18:03
Gate Adjustment
Departure Gate changed from 5 to A5
21 Feb
23:03
18:03
18:03
Gate Adjustment
Departure Gate changed from A5B to 5
21 Feb
14:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed from Feb-22-2026 9:08 AM to Feb-22-2026 9:21 AM
Scheduled Runway Arrival changed from Feb-22-2026 10:16 AM to Feb-22-2026 10:45 AM
21 Feb
14:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Feb-22-2026 9:08 AM
Scheduled Runway Arrival changed to Feb-22-2026 10:16 AM
21 Feb
02:34
21:34
21:34
Gate Adjustment
Departure Gate changed to A5B
21 Feb
00:52
19:52
19:52
Equipment Adjustment
Tail Number changed from N21154 to N17159
20 Feb
16:29
11:29
11:29
Time Adjustment
Estimated Gate Departure changed to Feb-22-2026 9:00 AM
Estimated Gate Arrival changed to Feb-22-2026 10:49 AM
Tail Number changed to N21154
Actual Equipment changed to E45
19 Feb
18:48
13:48
13:48
Record Created
19 Feb
18:48
13:48
13:48
Time Adjustment
Scheduled Gate Departure changed to Feb-22-2026 9:00 AM
Scheduled Gate Arrival changed to Feb-22-2026 10:49 AM
Scheduled Equipment changed to ERJ