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(UA) United Airlines 4257 Flight Details

Delayed by 41m | Arrived

Departure

IAD

Washington Dulles International Airport, VA, US

Flight Gate Times

01-Feb-2026

Scheduled

09:00

 EST

Actual

09:56

 EST

Total Departure Delay: 56 mins

Flight Runway Times

01-Feb-2026

Scheduled

10:21

 EST

Actual

10:25

 EST

Runway Delay: 4 mins

Terminal

-

Gate

A3C

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

Actual

11:38

 EST

Total Arrival Delay: 41 mins

Flight Runway Times

01-Feb-2026

Scheduled

11:53

 EST

Actual

11:32

 EST

Runway Delay: -

Terminal

-

Gate

11

Baggage Claim

3

Tail Number

N12145

Flight Time

Actual

1h 42m

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

Time

Date

UTC

Event

Data Updated

1 Feb

16:41

Estimated Gate Arrival changed from Feb-01-2026 11:39 AM to Feb-01-2026 11:38 AM

Actual Gate Arrival changed to Feb-01-2026 11:38 AM

1 Feb

16:33

Estimated Gate Arrival changed from Feb-01-2026 11:44 AM to Feb-01-2026 11:39 AM

1 Feb

16:32

Estimated Runway Arrival changed from Feb-01-2026 11:40 AM to Feb-01-2026 11:32 AM

Actual Runway Arrival changed to Feb-01-2026 11:32 AM

Status changed from Active to Landed

1 Feb

15:27

Estimated Runway Arrival changed from Feb-01-2026 11:27 AM to Feb-01-2026 11:40 AM

Estimated Gate Arrival changed from Feb-01-2026 11:57 AM to Feb-01-2026 11:44 AM

1 Feb

15:26

Estimated Runway Departure changed from Feb-01-2026 10:21 AM to Feb-01-2026 10:25 AM

Actual Runway Departure changed to Feb-01-2026 10:25 AM

Estimated Runway Arrival changed from Feb-01-2026 11:40 AM to Feb-01-2026 11:27 AM

1 Feb

15:15

Estimated Runway Arrival changed from Feb-01-2026 11:25 AM to Feb-01-2026 11:40 AM

1 Feb

15:02

Estimated Gate Departure changed from Feb-01-2026 10:00 AM to Feb-01-2026 9:56 AM

Actual Gate Departure changed to Feb-01-2026 9:56 AM

Status changed from Scheduled to Active

1 Feb

14:58

Estimated Runway Arrival changed from Feb-01-2026 11:53 AM to Feb-01-2026 11:25 AM

1 Feb

14:58

Estimated Runway Arrival changed to Feb-01-2026 11:53 AM

1 Feb

13:40

Estimated Runway Departure changed to Feb-01-2026 10:21 AM

1 Feb

11:03

Departure Gate changed from A5A to A3C

1 Feb

10:14

Arrival Gate changed to 11

Baggage changed to 3

1 Feb

09:38

Departure Gate changed from A4E to A5A

1 Feb

09:21

Tail Number changed from N11193 to N12145

1 Feb

07:39

Departure Gate changed from A4F to A4E

1 Feb

04:26

Tail Number changed from N12145 to N11193

1 Feb

01:50

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

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

Departure Gate changed from A2E to A4F

31 Jan

14:06

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

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

Departure Gate changed to A2E

30 Jan

21:09

Tail Number changed from N21129 to N12145

30 Jan

06:51

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

29 Jan

18:46

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