(UA) United Airlines 4257 Flight Details
On time | Scheduled
Departure
IAD
Washington Dulles International Airport, VA, US
Flight Gate Times
22-Mar-2026
Scheduled
09:00
EDT
Estimated
09:00
EDT
Total Departure Delay: -
Flight Runway Times
22-Mar-2026
Scheduled
09:21
EDT
Estimated
09:21
EDT
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-Mar-2026
Scheduled
10:49
EDT
Estimated
10:49
EDT
Total Arrival Delay: -
Flight Runway Times
22-Mar-2026
Scheduled
10:45
EDT
Actual
--
Runway Delay: -
Terminal
-
Gate
-
Baggage Claim
-
Tail Number
N16151
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 Mar
10:32
06:32
06:32
Gate Adjustment
Departure Gate changed from A4B to A2F
22 Mar
09:32
05:32
05:32
Gate Adjustment
Departure Gate changed from A6B to A4B
22 Mar
09:28
05:28
05:28
Time Adjustment
Estimated Runway Departure changed to Mar-22-2026 9:21 AM
22 Mar
08:56
04:56
04:56
Gate Adjustment
Departure Gate changed from 1 to A6B
22 Mar
06:55
02:55
02:55
Gate Adjustment
Departure Gate changed from A1 to 1
22 Mar
06:32
02:32
02:32
Gate Adjustment
Departure Gate changed from A5B to A1
22 Mar
05:50
01:50
01:50
Equipment Adjustment
Tail Number changed from N14153 to N16151
21 Mar
13:06
09:06
09:06
Time Adjustment
Scheduled Runway Departure changed from Mar-22-2026 9:05 AM to Mar-22-2026 9:21 AM
Scheduled Runway Arrival changed from Mar-22-2026 10:07 AM to Mar-22-2026 10:45 AM
21 Mar
13:01
09:01
09:01
Time Adjustment
Scheduled Runway Departure changed to Mar-22-2026 9:05 AM
Scheduled Runway Arrival changed to Mar-22-2026 10:07 AM
21 Mar
11:57
07:57
07:57
Gate Adjustment
Departure Gate changed from A2E to A5B
21 Mar
05:50
01:50
01:50
Time Adjustment
Estimated Gate Departure changed to Mar-22-2026 9:00 AM
Estimated Gate Arrival changed to Mar-22-2026 10:49 AM
Tail Number changed to N14153
Actual Equipment changed to E45
21 Mar
05:50
01:50
01:50
Gate Adjustment
Departure Gate changed to A2E
19 Mar
18:47
14:47
14:47
Record Created
19 Mar
18:47
14:47
14:47
Time Adjustment
Scheduled Gate Departure changed to Mar-22-2026 9:00 AM
Scheduled Gate Arrival changed to Mar-22-2026 10:49 AM
Scheduled Equipment changed to ERJ