Here are some of the most popular options:

Taxi:
- Official Taxis: Abundant and easily recognizable by their white color and red stripe. You can hail them at the airport taxi rank or pre-book through official radio taxi services.
- Ride-hailing Apps:  Uber and Cabify operate in Madrid, offering convenient booking and upfront fare estimates through their apps.

Shared Transfers:
- Airport Shuttle Buses: Shared shuttle buses are a cost-effective option for those traveling alone or in small groups. They operate between the airport and major hotels or central points in the city.

Public Transportation:
- Metro: The metro line 8 connects directly to the airport, offering a convenient and affordable option for those traveling light.
- Airport Express Bus: The Airport Express bus provides a direct route between Madrid-Barajas Airport and Atocha train station, a major transportation hub.

No matter your needs or preferences, Madrid offers a convenient and reliable airport transfer service to ensure a smooth and stress-free start to your trip.