AirHint found the following cheapest return flights from Knoxville (TYS) to Washington (IAD) in July 2025 (see full year).

Return flights

14 Jul - 25 Jul	Allegiant Air	direct
04 Jul - 11 Jul	Allegiant Air	direct
04 Jul - 07 Jul	Allegiant Air	direct
07 Jul - 11 Jul	Allegiant Air	direct
07 Jul - 25 Jul	Allegiant Air	direct
18 Jul - 26 Jul	Allegiant Air
18 Jul - 26 Jul	United	direct
03 Jul - 10 Jul	United	direct
02 Jul - 04 Jul	Allegiant Air
03 Jul - 07 Jul	United	direct

Also check the deals for one-way flights from Knoxville to Washington in July.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Knoxville to Washington in July from $80

Return flights