The 2019 champs made the most of Spain's misfortune to Switzerland to move two focuses clear at the highest point of Gathering A2.
Portugal should keep away from rout in their last gathering match against Spain on Tuesday to arrive at the following summer's finals.
Dalot's Manchester Joined colleague Bruno Fernandes scored the second and Diogo Jota added a late fourth.
Expecting to keep away from rout in Prague to offer themselves a chance at capability against Spain,
Fernando Santos' side answered decidedly to losing their past Countries Association match against Switzerland in June.
Dalot's first-time strike from Rafael Leao's scaled back and Fernandes' completion from Mario Rui's low cross put Portugal in charge.
Czech forward Patrik Schick couldn't split the shortage from the punishment spot before half-time after Cristiano Ronaldo was punished for handball.
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