€30 flat fee from the airport to Chamartin train station. No need to wait in line at the booth…read moreinside the terminal if you don't have any special needs - you can walk straight out and wait to be guided the first taxi available by the representative at the taxi stop. A word of warning, Chamartin station is under construction and can be a nightmare to get out of a taxi during peak times...
Currently, Spain still requires face masks to travel on any public transportation, so check the status of this rule before you anger the driver getting into the vehicle without a mask.