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

Return flights

03 Dec - 07 Dec	Spirit Airlines
04 Dec - 15 Dec	Spirit Airlines
26 Dec - 17 Jan	Spirit Airlines
16 Dec - 09 Jan	Spirit Airlines
17 Dec - 10 Jan	Spirit Airlines
28 Dec - 17 Jan	Spirit Airlines
13 Dec - 05 Jan	Spirit Airlines
11 Dec - 03 Jan	Spirit Airlines
10 Dec - 03 Jan	Spirit Airlines
04 Dec - 03 Jan	Spirit Airlines
18 Dec - 10 Jan	Spirit Airlines
03 Dec - 05 Jan	Spirit Airlines
20 Dec - 28 Dec	Spirit Airlines
24 Dec - 31 Dec	Spirit Airlines
20 Dec - 27 Dec	Spirit Airlines
18 Dec - 28 Dec	Spirit 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 $667

Return flights