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

Return flights

10 Jul - 17 Jul	easyJet
10 Jul - 14 Jul	easyJet
13 Jul - 18 Jul	Ryanair
10 Jul - 16 Jul	easyJet
11 Jul - 17 Jul	easyJet
10 Jul - 20 Aug	easyJet
10 Jul - 18 Jul	Ryanair
15 Jul - 28 Jul	easyJet
12 Jul - 18 Jul	Ryanair
15 Jul - 21 Jul	easyJet
02 Jul - 09 Jul	easyJet
29 Jul - 05 Aug	easyJet
04 Jul - 01 Aug	Ryanair
28 Jul - 03 Aug	easyJet
24 Jul - 09 Aug	Ryanair
28 Jul - 04 Aug	easyJet
28 Jul - 07 Aug	easyJet
31 Jul - 07 Aug	Ryanair
31 Jul - 08 Aug	Ryanair
23 Jul - 03 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 $313

Return flights