Cheapest one-way flights from Seattle to Florence in September from $427

AirHint found the following cheapest one-way flights from Seattle (SEA) to Florence (FLR) in September 2025 (see full year).

One-Way flights

20 Sep Frontier Airlines
23 Sep Frontier Airlines

Also check the deals for return flights from Seattle to Florence 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.

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