You could get the airport bus to Marbella and then another bus on from there, or train to Fuengirola, bus to Marbella and then on to Estepona. I think the airport bus is your best bet, or you could try one of the transfer companies like transfersdelsol.com or travel republic. Taxi would be about €90 each way.
Some of the airport buses go all the way to Estapona, otherwise it is very easy to get the direct bus To Marbella, as ceejay says, and then another to Estapona - there are plenty of them.
Last time I used the bus from the airport to Marbella, it was around 8euros one way.
Google avanzabus for timetables.
The airport bus to Estepona does not run as frequent at this time of year. There are only 2 buses 11.30 and 18.50. Depending on the times of the buses you can go airport to Marbella, train to Fuengirola then bus to Estepona or airport to Malaga and bus to Estepona.
Thank you all! Yesterday I tried to look at the avanzabus-website, but could only see it in Spanish? I try to look again!
Go to the top of the page and you will have an option to change it to english
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