Cheapest return flights from St. Petersburg to Key West in September from $96

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

Return flights

04 Sep - 24 Sep Allegiant Air direct
04 Sep - 22 Sep Allegiant Air direct
19 Sep - 26 Sep Allegiant Air direct
19 Sep - 24 Sep Allegiant Air direct
19 Sep - 22 Sep Allegiant Air direct
17 Sep - 26 Sep Allegiant Air direct
17 Sep - 24 Sep Allegiant Air direct
17 Sep - 22 Sep Allegiant Air direct
21 Sep - 26 Sep Allegiant Air direct
21 Sep - 24 Sep Allegiant Air direct

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