In Bali, the most reliable and convenient transportation is a Bluebird taxi. It is well marked, and the driver wears a certain uniform.
You can come to the airport from the town with a Bluebird taxi.
Unfortunately, a syndicate does not allow tourists to take a Bluebird taxi from the airport to town. You need to take the prepaid taxis which are more expensive.
But there is a way around of this!
As the Bluebird taxi drops passengers at the departure hall, all you need to do is to go to the departure hall from the arrival hall using the elevator. If you wait there for a while, you will get a Bluebird taxi. Just wave your hand, hop into one (quickly), and ask the driver to take you to the destination. You will save some money this way.
Uber or Grab works neither from the airport, so the Bluebird taxi is a savior. And don’t use the Bluebird taxi app at the airport because they do not have the official coverage for picking someone from the airport.