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

Return flights

01 Dec - 10 Jan	Aer Lingus
23 Dec - 26 Dec	China Southern
28 Dec - 15 Jan	easyJet
28 Dec - 13 Jan	Aer Lingus
29 Dec - 12 Jan	British Airways
06 Dec - 20 Dec	easyJet
20 Dec - 10 Jan	easyJet
20 Dec - 09 Jan	easyJet
26 Dec - 04 Jan	easyJet
20 Dec - 04 Jan	easyJet
18 Dec - 03 Jan	easyJet
12 Dec - 14 Dec	KLM
19 Dec - 02 Jan	Aer Lingus

Also check the deals for one-way flights from Belfast 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.

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Cheapest return flights from Belfast to Sydney in December from 1078€

Return flights