Caspian sea ferries are also an option for international travel to or from Baku. The two routes available from Baku are to Turkmenbashi, Turkmenistan, and to Aktau, Kazakhstan. Anyways, there are no strict schedules for them and they highly depend on the weather forecast. The trips are usually taken with cargo ships which sometimes have space for passengers, so don't expect anything too luxurious or too comfortable, for that matter.