While the weekly sales from AirTran usually offer some of the lowest fares to Key West, we just spotted this little guy from Delta and had to share: Philly to Key West for $315 round-trip, including all taxes, via Orbitz. Though the fare calendar initially listed a fare of $323, clicking on it lowered it to the $315 you see below. We sure love a hidden fare!

For a complete listing of fares to Key West, click here.

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