Defender Ruben Dias gave the hosts the lead with a stooping header from a corner in the 17th minute and Diogo Jota extended their lead from the spot after Francisco Conceicao was fouled inside the area in stoppage time before the break.
Fernandes, who was one of five substitutions at half-time, netted Portugal’s third with a fine curling shot into the upper corner from the edge of the box in the 55th minute.
Finland substitute Teemu Pukki took advantage of a complacent Portugal defence to score twice within five minutes to bring his side back into the game.
However, Fernandes took charge and secured the win with a close-range strike in the 84th minute.
Portugal face Croatia on Saturday and Ireland next week in their final warm-up games before they start their European Championship campaign on June 18 against Czech Republic in Group F. They will also take on Turkey and Georgia.
Watch Full Portugal vs Finland 4-2 Highlights | Friendly Match
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