Cheapest one-way flights from Knoxville to Washington in August from $39

AirHint found the following cheapest one-way flights from Knoxville (TYS) to Washington (IAD) in August 2025 (see full year).

One-Way flights

04 Aug Allegiant Air direct
29 Aug Allegiant Air direct

Also check the deals for return flights from Knoxville to Washington in August.

Skyscanner

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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