Cheapest return flights from Philadelphia (PHL) to Knoxville (TYS), September

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
21 Sep 16 Oct Allegiant Air
Direct Flight
21 Sep 09 Oct Allegiant Air
Direct Flight
21 Sep 12 Oct Allegiant Air
Direct Flight
25 Sep 16 Oct Allegiant Air
Direct Flight
21 Sep 05 Oct Allegiant Air
Direct Flight
14 Sep 05 Oct Allegiant Air
Direct Flight
25 Sep 09 Oct Allegiant Air
Direct Flight
21 Sep 28 Sep Allegiant Air
Direct Flight
14 Sep 28 Sep Allegiant Air
Direct Flight
25 Sep 12 Oct Allegiant Air
Direct Flight
08 Sep 11 Sep Frontier Airlines
25 Sep 05 Oct Allegiant Air
Direct Flight
04 Sep 11 Sep Allegiant Air
Direct Flight
11 Sep 13 Sep Allegiant Air
25 Sep 28 Sep Allegiant Air
Direct Flight
04 Sep 07 Sep Allegiant Air
Direct Flight
18 Sep 22 Sep Frontier Airlines
08 Sep 12 Sep Frontier Airlines
09 Sep 12 Sep Frontier Airlines
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deals for one-way flights from Philadelphia to Knoxville in September.

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Updated Aug 26, 2026.

About these fares

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