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To travel between Bodrum and Datça by bus, you will need to transfer in Marmaris.
If you can't find direct service between Bodrum and Marmaris, you can always transfer in Muğla, which is the provincial capital and a stopping point for long-distance buses travelling from north western Turkey to the western Mediterranean. If you can find an intercity bus for either leg of this trip, it will be more comfortable, but you will likely find it easier to take one of the local companies' smaller buses since they will have more departures. Bodrum to Marmaris will probably take close to four hours thanks in part to the steep descent prior to the plain near Gökova, but it really depends on how lucky you are with a connection in Muğla.
From Marmaris, there will be frequent minibuses to Datça.
According to the ferry website, the cost for a one-way ticket is €12. The total bus fares will exceed that, but not by a huge amount.
Upvote:2
Indeed! What SigueSigueBen said.
If you cant find a direct bus to Marmaris then just go for Mugla. From Mugla you will find a bus to Marmaris all day long. When you are inMmarmaris there will be minibuses to Datca. But I think the ferry will be available in September too. If the weather isn't bad they will be available.
When you arrive in Datca, be sure you visit Orcey hotel or even accommodate there. It has a fantastic architecture and a blue flagged beach.
Have fun on your trip!