AirHint found the following cheapest return flights from Adelaide (ADL) to London (LHR) in December 2025 (see full year).

Return flights

01 Dec - 07 Dec	Qantas
03 Dec - 27 Dec	British Airways
08 Dec - 09 Dec	British Airways
02 Dec - 27 Dec	British Airways
29 Dec - 18 Jan	Qatar Airways
31 Dec - 22 Jan	Qatar Airways
27 Dec - 29 Dec	British Airways
03 Dec - 03 Jan	British Airways
04 Dec - 27 Dec	China Southern
02 Dec - 25 Dec	Qatar Airways
27 Dec - 18 Jan	British Airways
03 Dec - 15 Jan	Emirates
05 Dec - 27 Dec	British Airways
23 Dec - 20 Jan	British Airways
27 Dec - 20 Jan	British Airways
25 Dec - 07 Jan	Qatar Airways
27 Dec - 16 Jan	Qatar Airways
25 Dec - 03 Jan	Qatar Airways
11 Dec - 31 Dec	Virgin Australia
08 Dec - 19 Dec	Qatar Airways

Also check the deals for one-way flights from Adelaide to London 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 Adelaide to London in December from $1448

Return flights