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

Return flights

08 Dec - 15 Dec	TAP
11 Dec - 15 Dec	TAP
02 Dec - 07 Dec	TAP
01 Dec - 07 Dec	TAP
15 Dec - 19 Jan	Aer Lingus
31 Dec - 24 Jan	TAP
28 Dec - 17 Jan	TAP
31 Dec - 25 Jan	Aer Lingus
16 Dec - 13 Jan	Aer Lingus
01 Dec - 08 Dec	Icelandair
07 Dec - 14 Dec	Icelandair
30 Dec - 06 Jan	Aer Lingus
10 Dec - 30 Dec	TAP
11 Dec - 30 Dec	TAP
04 Dec - 11 Dec	Icelandair
10 Dec - 17 Dec	Icelandair
10 Dec - 01 Jan	TAP
28 Dec - 17 Jan	Lufthansa	direct
31 Dec - 25 Jan	Lufthansa	direct
31 Dec - 24 Jan	Lufthansa	direct

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 391€

Return flights