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

Return flights

08 Dec - 13 Dec	Aer Lingus
01 Dec - 08 Dec	Icelandair
11 Dec - 18 Dec	Icelandair
28 Dec - 17 Jan	TAP
13 Dec - 20 Dec	Icelandair
14 Dec - 27 Dec	TAP
06 Dec - 13 Dec	Icelandair
15 Dec - 29 Dec	TAP
01 Dec - 08 Dec	Lufthansa	direct
16 Dec - 23 Dec	Icelandair
31 Dec - 07 Jan	Icelandair
31 Dec - 07 Jan	Lufthansa	direct
23 Dec - 30 Dec	Delta
26 Dec - 05 Jan	British Airways
18 Dec - 01 Jan	TAP
17 Dec - 10 Jan	KLM
11 Dec - 03 Jan	Lufthansa
19 Dec - 02 Jan	Icelandair
25 Dec - 04 Jan	TAP
19 Dec - 10 Jan	Iberia

Also check the deals for one-way flights from Boston 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 Boston to Frankfurt in December from $499

Return flights