AirHint found the following cheapest return flights from Seattle (SEA) to Brussels (BRU) in October 2025 (see full year).
Return flights
| 20 Oct - 27 Oct | United | ||
| 17 Oct - 08 Nov | Lufthansa | ||
| 18 Oct - 08 Nov | Lufthansa | ||
| 23 Oct - 25 Oct | Turkish Airlines | ||
| 22 Oct - 23 Oct | Hawaiian Airlines | ||
| 29 Oct - 01 Nov | Hawaiian Airlines |
Also check the deals for one-way flights from Seattle to Brussels in October.
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