Lisbon Airport to Sete Rios is one of those things that should work ....but doesn't. Lisbon has excellent public transport but somehow a direct transport link between these two hubs has been missed.
The nearest direct bus passes 600 metres away and there is no easy pedestrian access...I know I tried it last August en route to Cape Town. With bags etc it is not fun.
You will find a copy of this article with a png image copy of the relevant timetable page for the Rede Expressos Sete Rios - Lourinha service. Click on the images to open them.
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Hope this helps.