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

Return flights

10 Dec - 17 Dec	Icelandair
11 Dec - 31 Jan	Air France
19 Dec - 24 Jan	Frontier Airlines
20 Dec - 23 Jan	Aer Lingus
15 Dec - 06 Jan	Aer Lingus
20 Dec - 24 Jan	Aer Lingus
20 Dec - 25 Jan	Aer Lingus
24 Dec - 29 Dec	ITA Airways
18 Dec - 23 Dec	Frontier Airlines
21 Dec - 28 Dec	Frontier Airlines
25 Dec - 08 Jan	Iberia
20 Dec - 04 Jan	Icelandair
21 Dec - 04 Jan	Frontier Airlines
22 Dec - 01 Jan	Azores Airlines

Also check the deals for one-way flights from Boston to Warsaw 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 Warsaw in December from 619€

Return flights