To get from Porto in the Algarve, you need to travel by train from Porto to Faro, and then by train to the desired region, in Albufeira you can take a bus or taxi, it is within 20-25 km. There are quite a few trains that go between Porto and the Algarve. Their schedule depends on the date and the day of the week

To go by bus, you will have to make a transfer.

The cost can be the same or different by 1-2 EUR.