To get from Marseille Airport (MRS) to Aix en Provence, your two best options are taxis and buses.
Information about each option can be found below:
Taxis are most useful for visitors short on time or in need of door-to-door transportation from the airport to Aix. They are also convenient if you have large bags, as the bus drop-off point in Aix is a short walk from the city center. You can find out more about taking a taxi from Marseille Airport to Aix here.
Buses are most useful for those on a budget, as taxis cost 50 to 60 euros or more. The bus takes 30 minutes and departures take place every half hour, so the service is convenient. You can find out more about taking a bus from Marseille Airport to Aix here.