Cheapest one-way flights from Knoxville to Keflavik in September from $341

AirHint found the following cheapest one-way flights from Knoxville (TYS) to Keflavik (KEF) in September 2025 (see full year).

One-Way flights

03 Sep Allegiant Air

Also check the deals for return flights from Knoxville to Keflavik in September.

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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