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United Airlines United Airlines

UA4257 Flight Status

According to Trip.com real-time data, the UA4257 flight operated by United Airlines on Sep 21, 2026 is scheduled to fly from Washington D.C. (IAD) to Knoxville (TYS). The flight is expected to depart at 09:00 and land at 10:04 .
Sun, Sep 20
Mon, Sep 21
WAS-TYS

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Arrived
The flight has arrived 18m early
Washington D.C.(IAD)
09:17
Scheduled: 09:00, Sep 20
Dulles International Airport
173106C5-5199-4134-A176-6296CB3DA377 1h 37m
Knoxville(TYS)
10:19
Scheduled: 10:37, Sep 20
Mcghee Tyson Airport
Check-in Counter
AREA 4
Boarding Gate
A2F
Arrival Gate
11
Baggage
3
WAS-TYS

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Scheduled
Your flight will depart on time.
Washington D.C.(IAD)
09:00
Scheduled: 09:00, Sep 21
Dulles International Airport
173106C5-5199-4134-A176-6296CB3DA377 1h 37m
Knoxville(TYS)
10:04
Scheduled: 10:37, Sep 21
Mcghee Tyson Airport
Check-in Counter
AREA 4
Boarding Gate
A4E
Arrival Gate
--
Baggage
3
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Information provided by VariFlight For real-time updates, please check airport displays or contact your airline.
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UA4257

Track the Previous Flight Status: In Flight

UA4939
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Ithaca (ITH) Washington D.C. (WAS)
Scheduled: 07:18
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UA4257 Aircraft Details

According to Trip.com real-time data, the UA4257 flight flying from Washington D.C. to Knoxville on 9/21/2026 is operated by the aircraft model Embraer RJ 135/140/145. This aircraft has been in service for 23y, 4m. The aircraft is equipped with 50 seats.
flight status
Embraer RJ 135/140/145
Punctuality (Departure)
80%
Punctuality (Arrival)
90%
Late on average
5 minutes
Age
23y, 4m
Seats
50
Flight Distance
--
Economy
Premium Economy
In-Flight Services
Snacks
In-flight entertainment is unavailable
Wi-Fi is unavailable
No power outlets are available
Seat Information
79 cm
Legroom
--
Seat width
105°
Reclining Angle
1-2
Seat layout example
In-Flight Services
None
In-flight entertainment is unavailable
Wi-Fi is unavailable
No power outlets are available
Seat Information
97 cm
More legroom than on 14% of flights
--
Seat width
105°
Reclining Angle
--
Seat layout example
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Flight History for UA4257

Trip.com historical records show that the last UA4257 flight departed on Sun, Sep 20 from IAD at approximately 09:17. This flight is expected to arrrive in TYS at 10:19.
DateAirportAircraft ModelDepartureArrivalStatus
DepartureArrival
Sun, Sep 13Washington D.C. (IAD)Knoxville (TYS)E45X11:0712:17Arrived
Mon, Sep 14Washington D.C. (IAD)Knoxville (TYS)E45X09:2610:32Arrived
Thu, Sep 17Washington D.C. (IAD)Knoxville (TYS)E45X09:1310:14Arrived
Fri, Sep 18Washington D.C. (IAD)Knoxville (TYS)E45X09:1210:16Arrived
Sat, Sep 19Washington D.C. (IAD)Knoxville (TYS)E45X09:1910:20Arrived
Sun, Sep 20Washington D.C. (IAD)Knoxville (TYS)E45X09:1710:19Arrived
Mon, Sep 21Washington D.C. (IAD)Knoxville (TYS)E45X09:0010:04Scheduled
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UA4257 On-Time Performance

Based on the average performance of this flight over the past 30 trips, the on-time departure rate of UA4257 is 80% (Late on average 36 minutes), and the on-time arrival rate is 90% (Late on average 5 minutes).

On-Time Departures
Punctuality
80%
Late on average 36 minutes
Early
0%
On time
80%
30 mins late
10%
60 mins late
0%
90 mins late
10%
Canceled
0%
On-Time Arrivals
Punctuality
90%
Late on average 5 minutes
Early
83%
On time
7%
30 mins late
0%
60 mins late
0%
90 mins late
10%
Canceled
0%

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Frequently Asked Questions

  • What is the current status of flight ua4257?

    Flight ua4257 has not departed yet and is currently on schedule. Scheduled departure 09:00, arrival 10:37 (updated Sep 21, 2026).
  • Flight ua4257 has not departed yet and is currently on schedule. Scheduled departure is 09:00, with arrival at 10:37. Recheck gate and timing before you head to the airport.
  • Flight ua4257 is scheduled to depart at 09:00. The latest actual or estimated departure time is 09:00, and the current status is Scheduled (updated Sep 21, 2026).
  • Flight ua4257 is scheduled to arrive at 10:37. The latest estimated or actual arrival time is 10:04. Status is Scheduled as of Sep 21, 2026.
  • Flight ua4257 is operated by United Airlines from Washington D.C. (IAD) to Knoxville (TYS). Typical flight time is about 1 hour37 minutes; operating days may include Monday.
  • Track flight ua4257 on this Trip.com status page for live departure, arrival, gate and baggage updates. For push alerts on the go, open the same flight in the Trip.com App and turn on flight notifications.
  • If ua4257 is delayed or canceled, first confirm the latest status here (Scheduled, updated Sep 21, 2026). Contact United Airlines or your booking channel for rebooking or refund options, and check Trip.com Manage Booking if you booked on Trip.com.
  • Flight ua4257 has not departed from Washington D.C. (IAD) yet and is currently on schedule for 09:00.
  • Flight ua4257 usually flies a Embraer RJ 135/140/145 with seat layout 1-2. Layouts can differ by aircraft subtype and cabin product—confirm your seat map in Manage Booking after you purchase.

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Arrival Info: Knoxville Weather & Current Time

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Mostly clear
|
21°C - 35°C
Weather forecast for your arrival day
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0 hour time difference
Time on arrival: Washington D.C. 10:04| Knoxville 10:04

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