The following is posted on the La Manzanilla Life facebook page. The current cost is 25 pesos from La Manzanilla to Melaque.
Local bus Buses between Melaque and La Manzanilla run five times daily, cost in pesos is equivalent to about 1.20 USD, the ride is approximately 30 minutes and you pay as you get on the bus.
Departs La Manzanilla: 8:30 & 10:30 a.m. and 1:30, 3:30 and 5:30 p.m. The bus originates just south of the primary school but you can wave it down anywhere along the main street and it will stop to pick you up.
Departs Melaque: 7:45 & 9:45 a.m. and 12:45, 3:00 and 4:45 p.m. The bus station in Melaque is located near the middle of the main street going through town.
Melaque to Barra: hop a bus every 15 minutes from the main Melaque bus station.
From Melaque to Cihuatlan: Departs every 15 minutes in front of the central bus station between the hours of 7:00am to 8:00pm. They are called “Minibuses” and are purple and white or green and white.
We were in Melaque the other day waiting for the 4:45 bus back to La Manz and a senora operating a cart in front of the benches said the bus did not go to La Manzanilla until 6:00. We didn't want to wait another hour and a half so we took a taxi back. Is this correct or was she the taxi drivers wife looking for business LOL?