Cheapest return flights from Key West to St. Petersburg in September from $86

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

Return flights

08 Sep - 19 Sep Allegiant Air direct
08 Sep - 28 Sep Allegiant Air direct
26 Sep - 28 Sep Allegiant Air direct
26 Sep - 13 Oct Allegiant Air direct
26 Sep - 01 Oct Allegiant Air direct
29 Sep - 13 Oct Allegiant Air direct
29 Sep - 01 Oct Allegiant Air direct
08 Sep - 21 Sep Allegiant Air direct
08 Sep - 15 Sep Allegiant Air direct
08 Sep - 18 Sep Allegiant Air direct
08 Sep - 20 Sep Allegiant Air direct
08 Sep - 13 Sep Allegiant Air direct
08 Sep - 14 Sep Allegiant Air direct
08 Sep - 17 Sep Allegiant Air direct
26 Sep - 04 Oct Allegiant Air direct
26 Sep - 11 Oct Allegiant Air direct
18 Sep - 01 Oct Allegiant Air direct
11 Sep - 01 Oct Allegiant Air direct
12 Sep - 01 Oct Allegiant Air direct
19 Sep - 01 Oct Allegiant Air direct

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

Book a cheap hotel in St. Petersburg

Cheap car rent in St. Petersburg

Feel free to contact us with any feedback or request another flight research.