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

Return flights

02 Dec - 20 Jan	Lufthansa	direct
06 Dec - 09 Dec	Brussels Airlines	direct
12 Dec - 15 Dec	Brussels Airlines	direct
10 Dec - 13 Dec	Brussels Airlines	direct
04 Dec - 08 Dec	Brussels Airlines	direct
22 Dec - 28 Dec	Brussels Airlines	direct
08 Dec - 10 Dec	Brussels Airlines
22 Dec - 26 Dec	easyJet
08 Dec - 10 Dec	Brussels Airlines	direct
22 Dec - 26 Dec	Brussels Airlines	direct

Also check the deals for one-way flights from Frankfurt 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 Frankfurt to Brussels in December from 165€

Return flights