Airport Shuttle in Santiago
The best way to get from the airport downtown is a private taxi.
This should cost around US$10 or so. It’s a good deal.
When you go through Passport Control, you should see a kiosk on your left for Turbus.
You should go there and either take a Turbus or use TransVIP, which shares the booth.
TransVip is a hair cheaper than Turbus and both are good quality.
The TransVip website’s online booking doesn’t always work.
If it doesn’t, you can book via email.
Just be sure to avoid the assertive taxi drivers everywhere! They’re persistent.