Is UA4257 delayed?
No — UA4257 landed in Knoxville 22 min early, at 10:15 on Sep 29 (as of Sep 29, 14:15 UTC).
Usually on time: arrived within 15 min of schedule on 14 of the last 14 flights.
22 min early
Official source · Updated
Departure
Dulles
IAD
Actual
Scheduled 09:17
Sep 29
Arrival
Knoxville
TYS
Actual
Scheduled 10:37
Sep 29
Times shown in airport local time
Service date: · Scheduled departure date (America/New_York)
Market settled: On time.
Think UA4257 runs late on Sep 30? Delayed is trading at 22¢ — pays out x4.58.
Will United Airlines UAL 4257 from Dulles to Knoxville arrive on time, be delayed, or be cancelled on Sep 30?Flight details
Departure · UTC
- Scheduled
- Estimated
- Not available
- Actual
Arrival · UTC
- Scheduled
- Estimated
- Not available
- Actual
Market prices express trading expectations about a contract’s stated threshold. They do not confirm airline status. The linked market shows its terms and activity.
Recent arrivals
Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.
- 22 min early
Dulles → Knoxville
- 14 min early
Dulles → Knoxville
- 21 min early
Dulles → Knoxville
- 29 min early
Dulles → Knoxville
- 4 min early
Dulles → Knoxville
Is UA4257 usually late?
Observation window: Aug 30, 2026 – Sep 29, 2026
On time means arriving no more than 15 minutes after the scheduled time; late means more than 15 minutes after. Cancelled and diverted flights are counted apart from arrivals. Results compare scheduled and actual arrival times. Cancelled or diverted flights are excluded. Some flights may be missing from the history.
At the airports today
Dulles (IAD) departures
- Left more than 15 min late
- 22 of 167
- Cancelled today
- 0
Related flights
Flight history and details
| Service date | Departure | Arrival | Actual | Arrival delay (minutes) |
|---|---|---|---|---|
| Sep 29, 2026Arrived | Dulles | Knoxville | -22 | |
| Sep 28, 2026Arrived | Dulles | Knoxville | -14 | |
| Sep 27, 2026Arrived | Dulles | Knoxville | -21 | |
| Sep 26, 2026Arrived | Dulles | Knoxville | -29 | |
| Sep 24, 2026Arrived | Dulles | Knoxville | -4 | |
| Sep 21, 2026Arrived | Dulles | Knoxville | -22 | |
| Sep 19, 2026Arrived | Dulles | Knoxville | -13 | |
| Sep 18, 2026Arrived | Dulles | Knoxville | -17 | |
| Sep 17, 2026Arrived | Dulles | Knoxville | -19 | |
| Sep 7, 2026Arrived | Dulles | Knoxville | -4 | |
| Sep 6, 2026Arrived | Dulles | Knoxville | -25 | |
| Sep 5, 2026Arrived | Dulles | Knoxville | -25 | |
| Sep 4, 2026Arrived | Dulles | Knoxville | -20 | |
| Aug 31, 2026Arrived | Dulles | Knoxville | -12 |
Email me if UA4257 runs late
We email you if your next UA4257 flight in the coming day is more than 15 minutes late, cancelled or diverted. Alerts last 30 days. No account needed.