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

Return flights

02 Dec - 09 Dec	British Airways
03 Dec - 10 Dec	British Airways
07 Dec - 14 Dec	British Airways	direct
08 Dec - 15 Dec	British Airways
12 Dec - 21 Dec	Delta
02 Dec - 27 Dec	KLM
12 Dec - 19 Dec	United
29 Dec - 05 Jan	British Airways
12 Dec - 19 Dec	British Airways	direct
18 Dec - 17 Jan	KLM
15 Dec - 31 Dec	Virgin Atlantic
13 Dec - 20 Dec	United
23 Dec - 06 Jan	Delta
14 Dec - 03 Jan	KLM
28 Dec - 04 Jan	United
27 Dec - 02 Jan	Spirit Airlines
14 Dec - 03 Jan	British Airways	direct
27 Dec - 02 Jan	British Airways	direct

Also check the deals for one-way flights from Austin 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 Austin to London in December from 488€

Return flights