AirHint found the following cheapest return flights from Sydney (SYD) to Porto (OPO) in December 2025 (see full year).

Return flights

26 Dec - 29 Jan	Turkish Airlines
31 Dec - 14 Jan	Turkish Airlines
05 Dec - 12 Jan	Turkish Airlines
10 Dec - 26 Dec	Turkish Airlines
10 Dec - 27 Dec	Turkish Airlines
10 Dec - 29 Dec	Turkish Airlines
11 Dec - 29 Dec	Garuda Indonesia
20 Dec - 12 Jan	Turkish Airlines
11 Dec - 26 Dec	Turkish Airlines
12 Dec - 26 Dec	Turkish Airlines
13 Dec - 26 Dec	Turkish Airlines
11 Dec - 27 Dec	Turkish Airlines
12 Dec - 27 Dec	Turkish Airlines
13 Dec - 27 Dec	Turkish Airlines
19 Dec - 12 Jan	Turkish Airlines

Also check the deals for one-way flights from Sydney to Porto in December.

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 Sydney to Porto in December from $1466

Return flights