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Just my update on the ferries Est to West, with a 4wd, thought it might help.
Timur to Flores
From : Kupang
To : Larantuka
Frequency : twice a week, check for weather updates. Mondays and Thursdays.
Price : 1.170.000rp
Note : be there the day before, sleep on the docks. Boat is overcrowded and having bought a ticket does not mean necessarily you will board.
Length : 16 to 20h
Flores to Sumbawa
From : Labuhan Bajo
To : Sape
Frequency : once a day, tickets sells at 7AM, board at 8AM.
Price : 847.000rp
Note : there is a 10.000rp fee to register the car, then 837.000rp for the actual ticket.
Length : 8h
Sumbawa to Lombok
From : Pototano (Poto Tano)
To : Labuhan Lombok
Frequency : every hour, 24/7.
Price : 378.000rp
Note : last ATM is in Alas, 25km from Pototano.
I will keep this one updated with the info as I go.
PS : there are toilets on each ship, but don't expect comfort. Food and bevvies are sold at high price. Be the first to board and get comfy as soon as you can, bring a mat if you need sleeping on the floor. Or in your car of you can. Music non stop, don't expect much sleep, but it's fun and the trukkies are pretty cool.