AirHint found the following cheapest return flights from Boston (BOS) to Vienna (VIE) in December 2025 (see full year).

Return flights

13 Dec - 10 Jan	Spirit Airlines
07 Dec - 12 Dec	KLM
05 Dec - 10 Dec	Lufthansa
15 Dec - 23 Dec	Azores Airlines
16 Dec - 13 Jan	Spirit Airlines
12 Dec - 20 Dec	Frontier Airlines
15 Dec - 18 Dec	TAP
30 Dec - 04 Jan	SWISS
18 Dec - 07 Jan	Frontier Airlines
19 Dec - 23 Dec	Frontier Airlines
24 Dec - 04 Jan	Lufthansa
19 Dec - 06 Jan	Frontier Airlines
19 Dec - 30 Dec	Frontier Airlines
09 Dec - 16 Dec	Austrian Airlines	direct
07 Dec - 12 Dec	Austrian Airlines	direct

Also check the deals for one-way flights from Boston to Vienna 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 Boston to Vienna in December from $732

Return flights