So, I've decided to go on a trip starting in Lisbon, going to Porto and ending in Barcellona (thanks for the advice, PHeymong!). How can I get the best airfare rate? I'd like to fly from SEA-TAC to Lisbon, then back to SEA-TAC from Barcelona. How soon before the trip should I buy? Is there a website I should follow prices on?
Appreciate any help you Gumbo guys can give me.