Cheapest return flights from St. Petersburg to Knoxville in December from $87

AirHint found the following cheapest return flights from St. Petersburg (PIE) to Knoxville (TYS) in December 2025 (see full year).

Return flights

20 Dec - 05 Jan Allegiant Air direct
24 Dec - 05 Jan Allegiant Air direct
20 Dec - 24 Dec Allegiant Air direct
31 Dec - 04 Jan Allegiant Air direct
25 Dec - 05 Jan Allegiant Air direct
27 Dec - 05 Jan Allegiant Air direct
20 Dec - 23 Dec Allegiant Air direct
26 Dec - 05 Jan Allegiant Air direct
20 Dec - 29 Dec Allegiant Air direct
24 Dec - 29 Dec Allegiant Air direct
20 Dec - 09 Jan Allegiant Air direct
24 Dec - 09 Jan Allegiant Air direct
22 Dec - 05 Jan Allegiant Air direct
22 Dec - 24 Dec Allegiant Air direct
25 Dec - 29 Dec Allegiant Air direct
26 Dec - 29 Dec Allegiant Air direct
24 Dec - 28 Dec Allegiant Air direct
20 Dec - 28 Dec Allegiant Air direct
27 Dec - 29 Dec Allegiant Air direct
25 Dec - 09 Jan Allegiant Air direct

Also check the deals for one-way flights from St. Petersburg to Knoxville in December.

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