AirHint found the following cheapest return flights from Atlanta (ATL) to Brussels (BRU) in December 2025 (see full year).
Return flights
| 12 Dec - 23 Dec | United | ||
| 01 Dec - 27 Dec | Turkish Airlines | ||
| 19 Dec - 10 Jan | Frontier Airlines | ||
| 19 Dec - 28 Dec | Frontier Airlines | ||
| 13 Dec - 03 Jan | Spirit Airlines | ||
| 21 Dec - 03 Jan | Frontier Airlines |
Also check the deals for one-way flights from Atlanta to Brussels in December.
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