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

Return flights

01 Jul - 08 Jul	Vueling Airlines
23 Jul - 28 Jul	Ryanair
09 Jul - 23 Jul	Ryanair
22 Jul - 26 Jul	easyJet
03 Jul - 07 Jul	Ryanair
02 Jul - 07 Jul	easyJet
14 Jul - 24 Jul	Ryanair
04 Jul - 10 Jul	Ryanair
12 Jul - 17 Jul	Ryanair
12 Jul - 18 Jul	Ryanair
26 Jul - 05 Aug	Wizz Air Malta
28 Jul - 07 Aug	easyJet
28 Jul - 06 Aug	easyJet
29 Jul - 06 Aug	easyJet
23 Jul - 03 Aug	easyJet
25 Jul - 01 Aug	Ryanair
26 Jul - 03 Aug	Ryanair
27 Jul - 03 Aug	easyJet
26 Jul - 02 Aug	Ryanair

Also check the deals for one-way flights from Porto to Istanbul 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 Porto to Istanbul in July from $303

Return flights