Cheapest return PDX–SOF flights, May

AirHint found the following cheapest return flights from Portland (PDX) to Sofia (SOF) in May 2026 (see full year).

Return flights

17 May - 07 Jun WestJet
18 May - 07 Jun Icelandair
09 May - 23 May SWISS

Also check the deals for one-way flights from Portland to Sofia in May.

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