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

Return flights

10 Dec - 23 Dec	Brussels Airlines
07 Dec - 26 Dec	Brussels Airlines
05 Dec - 10 Dec	TAP
23 Dec - 30 Dec	Air Canada
30 Dec - 11 Jan	Iberia
06 Dec - 01 Jan	Air Canada
05 Dec - 13 Dec	TAP
14 Dec - 06 Jan	British Airways
14 Dec - 05 Jan	British Airways
17 Dec - 10 Jan	British Airways
12 Dec - 21 Dec	TAP
13 Dec - 21 Dec	British Airways
23 Dec - 01 Jan	Air Canada
10 Dec - 04 Jan	British Airways
14 Dec - 04 Jan	British Airways
11 Dec - 04 Jan	British Airways
12 Dec - 04 Jan	British Airways
19 Dec - 27 Dec	Air Canada

Also check the deals for one-way flights from Boston to Brussels 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 Brussels in December from $362

Return flights