United Airlines flight UA 4257: Washington Dulles - Knoxville

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 08:30 Washington Dulles (IAD) 10:00 Knoxville (TYS)
UA 4257 Non-stop Embraer ERJ 135 / ERJ 140 / ERJ 145 (ERJ) 1:30 Effective from 2026-05-21
Daily 09:00 Washington Dulles (IAD) 10:56 Knoxville (TYS)
UA 4257 Non-stop Embraer ERJ 135 / ERJ 140 / ERJ 145 (ERJ) 1:56 Valid until 2026-01-05
Daily 09:00 Washington Dulles (IAD) 10:57 Knoxville (TYS)
UA 4257 Non-stop Embraer ERJ 135 / ERJ 140 / ERJ 145 (ERJ) 1:57 Effective 2026-01-06 through 2026-02-11
Daily 09:00 Washington Dulles (IAD) 10:49 Knoxville (TYS)
UA 4257 Non-stop Embraer ERJ 135 / ERJ 140 / ERJ 145 (ERJ) 1:49 Effective 2026-02-12 through 2026-05-20
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United Airlines flight UA 4257:
Washington Dulles - Knoxville
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA4257
08:30
Washington Dulles (IAD)

10:00
Knoxville (TYS)
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:30, non-stop
Embraer ERJ 135 / ERJ 140 / ERJ 145 (ERJ)
Direct Flights:
United Airlines UA4257
09:00
Washington Dulles (IAD)

10:56
Knoxville (TYS)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:56, non-stop
Embraer ERJ 135 / ERJ 140 / ERJ 145 (ERJ)
Direct Flights:
United Airlines UA4257
09:00
Washington Dulles (IAD)

10:57
Knoxville (TYS)
Effective 2026-01-06 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:57, non-stop
Embraer ERJ 135 / ERJ 140 / ERJ 145 (ERJ)
Direct Flights:
United Airlines UA4257
09:00
Washington Dulles (IAD)

10:49
Knoxville (TYS)
Effective 2026-02-12 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:49, non-stop
Embraer ERJ 135 / ERJ 140 / ERJ 145 (ERJ)
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  • UA 4257 is a domestic flight departing from the Washington Dulles airport (IAD) and arriving at Knoxville airport (TYS).
  • The flight distance is 419 miles, or 675 km.
  • The timezone of both the departure and the arrival airports is UTC-5 . Current time at both airports is (loading...).
  • For direct flights, the flight time varies between 1:30 and 1:57.
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