There are ways that you still hike the W (or at least some of it) even if the campsites or refugios you want in Torres del Paine are fully booked.
You can hike back to Paine Grande and spend the night there.
It basically shows you the availability of accommodation in the national park and allows you to book it directly through them.
I suggest doing this a couple of days before you plan on beginning your hike.
Many tour agencies based in Puerto Natales will have booked out spaces for prospective clients, meaning it’s still possible to get reservations.
- A rental car. - Go with a tour from Puerto Natales.