There are many travel websites that are set up to deliver bargains or discounted airfare. This one was originally set up to provide the most efficient and direct routing of air travel to Portugal.
The owner of the site is a retired veteran of TAP airlines and spent many years coordinating travel to Portugal. If you are looking to fly to Portugal, you will not only find very direct routes to and from Portugal, including multi-destination routing but also, extremely competitive pricing. Have a look and you can book here (I always do!): www.departuresandarrivals.us