Cheapest return flights from Key West to St. Petersburg in September from $88

AirHint found the following cheapest return flights from Key West (EYW) to St. Petersburg (PIE) in September 2025 (see full year).

Return flights

27 Sep - 04 Oct Allegiant Air direct
27 Sep - 15 Oct Allegiant Air direct
27 Sep - 13 Oct Allegiant Air direct
25 Sep - 04 Oct Allegiant Air direct
25 Sep - 15 Oct Allegiant Air direct
24 Sep - 04 Oct Allegiant Air direct
24 Sep - 15 Oct Allegiant Air direct
24 Sep - 25 Sep Allegiant Air direct
25 Sep - 13 Oct Allegiant Air direct
24 Sep - 13 Oct Allegiant Air direct
27 Sep - 18 Oct Allegiant Air direct
27 Sep - 29 Sep Allegiant Air direct
25 Sep - 29 Sep Allegiant Air direct
24 Sep - 29 Sep Allegiant Air direct
22 Sep - 25 Sep Allegiant Air direct
22 Sep - 24 Sep Allegiant Air direct
22 Sep - 29 Sep Allegiant Air direct
28 Sep - 29 Sep Allegiant Air direct
21 Sep - 25 Sep Allegiant Air direct
21 Sep - 24 Sep Allegiant Air direct

Also check the deals for one-way flights from Key West to St. Petersburg in September.

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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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