AirHint found the following cheapest return flights from Ljubljana (LJU) to Porto (OPO) in July 2025 (see full year).

Return flights

05 Jul - 11 Jul	Air Serbia
29 Jul - 01 Aug	SWISS
09 Jul - 11 Jul	Air Serbia
09 Jul - 17 Jul	Air Serbia
09 Jul - 18 Jul	Air Serbia
08 Jul - 17 Jul	Air Serbia
25 Jul - 27 Jul	KLM
13 Jul - 25 Jul	Air Serbia
10 Jul - 21 Jul	Air Serbia
09 Jul - 10 Jul	Air France
10 Jul - 20 Jul	Air Serbia

Also check the deals for one-way flights from Ljubljana to Porto in July.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Ljubljana to Porto in July from $356

Return flights