Question : What day in the next four weeks has the best fares?
Answer : Apr 25th has seen bookings (as of Apr 24th) as cheap as $875. That comes in 44% below the average price for this route. Saving now means you'll have more cash to spend on your trip.
Question : How long do most people stay in Lisbon?
Answer : Of course you're not most people, but if you were, you'd stay roughly 15 days.
Question : Do prices fluctuate more for this route than others?
Answer : Flight prices change a lot more than the majority of routes from the United States for PHX to LIS. They vary anywhere from $875 to $7,010. The further out you book a route, the more likely you are to save.
Question : Will you do what it takes to get the absolute cheapest flight?
Answer : Wednesday is your lowest-cost day to fly in May. Flexibility is paramount when booking travel plans in order to keep travel costs down.