Originally Posted by
MSPeconomist
It's pleasant drive or take the train from Lisbon to Porto. Depending on your plans near Porto and for your entire trip), it could make sense to pick up a rental car at LIS (where you can walk from baggage claim to the rental car area). It's also easy to stay near LIS 9or in the city itself) and do the drive the next day.
And there is also option to use train to travel from Lisbon to Porto. The fastest trains take less than 3 hours. See
www.cp.pt for timetables and ticket prices.