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

Return flights

04 Dec - 07 Dec	Air Europa
30 Dec - 24 Jan	KLM
30 Dec - 11 Jan	transavia
28 Dec - 11 Jan	Wizz Air Malta
17 Dec - 14 Jan	Ryanair
26 Dec - 05 Jan	TAP
23 Dec - 03 Jan	Air Europa
15 Dec - 22 Dec	Ryanair
25 Dec - 04 Jan	Wizz Air Malta
14 Dec - 21 Dec	Ryanair
26 Dec - 02 Jan	TAP
29 Dec - 05 Jan	Qatar Airways
28 Dec - 04 Jan	Qatar Airways

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

Book a cheap hotel in Sydney

Cheap car rent in Sydney

Cheapest return flights from Porto to Sydney in December from $1109

Return flights