Is there another (other than the car service of $55 each way) safe and reliable source of transportation to get to and from the Santiago Airport?
The taxi is actually $110 aprox each way. the other alternative is to rent a car.
I used AMSTAR which is a shuttle company that offers round trip air conditioned server to several hotels and resorts. The ride was about 45 minutes from the airport but only about 20/30 per person round trip. It was worth it for me to do this and I believe it saved time and money.
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