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

Return flights

09 Dec - 16 Dec	Lufthansa
02 Dec - 09 Dec	British Airways
03 Dec - 10 Dec	British Airways
08 Dec - 15 Dec	British Airways
10 Dec - 17 Dec	Delta
05 Dec - 12 Dec	Spirit Airlines
01 Dec - 08 Dec	British Airways
04 Dec - 11 Dec	Delta
06 Dec - 13 Dec	Spirit Airlines
07 Dec - 14 Dec	British Airways
31 Dec - 07 Jan	Lufthansa
30 Dec - 06 Jan	Lufthansa
25 Dec - 01 Jan	British Airways
29 Dec - 05 Jan	Spirit Airlines
26 Dec - 02 Jan	Spirit Airlines
28 Dec - 04 Jan	Lufthansa
27 Dec - 03 Jan	Delta

Also check the deals for one-way flights from Austin to Bucharest 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 Bucharest in December from $538

Return flights