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(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

Time

Date

UTC

Event

Data Updated

22 Feb

06:52

Departure Gate changed from A5 to A2F

22 Feb

06:46

Tail Number changed from N17159 to N21154

21 Feb

23:03

Departure Gate changed from 5 to A5

21 Feb

23:03

Departure Gate changed from A5B to 5

21 Feb

14:06

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

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

Departure Gate changed to A5B

21 Feb

00:52

Tail Number changed from N21154 to N17159

20 Feb

16:29

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

19 Feb

18:48

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