Cheapest return flights from Klagenfurt to Porto in May from $150

AirHint found the following cheapest return flights from Klagenfurt (KLU) to Porto (OPO) in May 2026 (see full year).

Return flights

06 May - 11 May Ryanair
07 May - 12 May Austrian Airlines
13 May - 16 May Austrian Airlines

Also check the deals for one-way flights from Klagenfurt to Porto in May.

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