How to arrive

Underground line E

If you are thinking visit Porto, the best way is travel by plain. Raiynair is operating in Porto's airport and is a low cost company, you can come in flexible dates with low prices.
If you come to Porto by plain you will arrive in Francisco Sá Carneiro airport. You must take a taxi or the underground to drive you to the center of the city, the underground  is cheaper then taxi and will let you in the center town. you must follow in the airport the subway indicators and take the line "E" purple collour with the direction Dragon Stadium and travel in to the station Trindade, here you can take other directions.To buy your ticket to travel you must search the tickets machine and  buy a Z4 ticket to travel from airport to the center.

Validation spot

"First of all: ALWAYS validate your ticket. You have to validate before initiating a trip and when you change vehicles (changing metro line, changing from metro to bus, etc). When you end your trip you don't have to validate. There are validating spots in the metro stations and inside the buses.There are tickets specially thought for tourists - the Andante Tour. There are 2 modalities: Andante Tour 1 (5,00€, valid for 24h, all zones) and Andante Tour 3 (11,00€, valid for 72h, all zones). During the 24h/72h period after the first validation, you can use it to travel without zone restrictions in all Porto Metropolitan Area.
The Gold Andante is for monthly passes, you probably won't need them except if you intend to stay in Porto longer than a month. It costs 5,00€ (only the card) plus the monthly pass cost.
The Blue Andante is for single trips or Andante24 (valid for 24h and a certain number of zones) purchases. The card itself costs 0,50€ and you can buy it in the machines placed in metro stations, andante stores, train stations and quiosks. Don't forget: 2 or more persons can't use the same ticket at the same time! 1 person = 1 ticket! Counting the right number of zones can be very tricky sometimes and there are heavy fines for people caught with the wrong ticket. You'll probably need only Z2 tickets for the tourist zones but be careful anyway."