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Many don't know this, and I didn't either until my last night in Santiago when I needed a very early taxi the next morning to get to the airport, but you can now schedule a taxi through booking.com.
90 days at a minimum is needed. And if you are on the Camino and only 90 days are left on your passport, you might not be able to get back. Before getting into this bind, and if you already have a trip planned, go to the embassy to seek help.
My husband walked from Santiago to the airport, so it must be possible. He said he just walked backwards and there is a sign that says "to the airport."
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