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

Return flights

03 Dec - 08 Dec	Lufthansa
07 Dec - 14 Dec	British Airways	direct
14 Dec - 15 Jan	Delta
14 Dec - 08 Jan	KLM
05 Dec - 11 Dec	Frontier Airlines
07 Dec - 23 Dec	United
01 Dec - 07 Dec	Air Canada
05 Dec - 08 Dec	Air France
31 Dec - 24 Jan	KLM
25 Dec - 07 Jan	Delta
07 Dec - 12 Dec	Spirit Airlines
03 Dec - 07 Dec	Delta
31 Dec - 24 Jan	British Airways	direct
03 Dec - 08 Dec	British Airways	direct
05 Dec - 13 Dec	Frontier Airlines
07 Dec - 11 Jan	United
15 Dec - 10 Jan	Air France
24 Dec - 18 Jan	KLM
05 Dec - 11 Jan	Spirit Airlines
29 Dec - 12 Jan	Frontier Airlines

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 527€

Return flights