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

Return flights

10 Dec - 17 Dec	Spirit Airlines
26 Dec - 08 Jan	Spirit Airlines
17 Dec - 08 Jan	Spirit Airlines
18 Dec - 08 Jan	Frontier Airlines
11 Dec - 18 Dec	Spirit Airlines
17 Dec - 07 Jan	Spirit Airlines
16 Dec - 19 Dec	KLM
23 Dec - 04 Jan	Spirit Airlines
22 Dec - 04 Jan	Allegiant Air
18 Dec - 21 Dec	Frontier Airlines
21 Dec - 04 Jan	Spirit Airlines
21 Dec - 30 Dec	Frontier Airlines
20 Dec - 04 Jan	Frontier Airlines
30 Dec - 06 Jan	Lufthansa	direct
21 Dec - 01 Jan	Frontier Airlines
11 Dec - 18 Dec	Lufthansa	direct

Also check the deals for one-way flights from Austin to Frankfurt 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 Frankfurt in December from 972€

Return flights