AirHint found the following cheapest return flights from Porto (OPO) to Istanbul (IST) in March 2026 (see full year).

Return flights

14 Mar - 18 Mar	Vueling Airlines
12 Mar - 14 Mar	Vueling Airlines
14 Mar - 19 Mar	Vueling Airlines
12 Mar - 19 Mar	Vueling Airlines
12 Mar - 18 Mar	Vueling Airlines
14 Mar - 15 Mar	Vueling Airlines
30 Mar - 05 Apr	Iberia
29 Mar - 05 Apr	Ryanair
14 Mar - 18 Mar	Turkish Airlines	direct

Also check the deals for one-way flights from Porto to Istanbul in March.

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 March from $251

Return flights