AirHint found the following cheapest return flights from San Francisco (SFO) to Brussels (BRU) in September 2025 (see full year).

Return flights

17 Sep - 26 Sep	Air Canada
16 Sep - 23 Sep	SWISS
15 Sep - 25 Sep	SWISS
30 Sep - 07 Oct	SWISS
14 Sep - 21 Sep	SWISS
23 Sep - 30 Sep	SWISS
24 Sep - 01 Oct	SWISS
18 Sep - 25 Sep	SWISS
22 Sep - 29 Sep	SWISS
25 Sep - 02 Oct	SWISS
29 Sep - 06 Oct	SWISS
28 Sep - 18 Oct	Iberia
26 Sep - 29 Sep	Air Canada
26 Sep - 05 Oct	United
25 Sep - 04 Oct	Air France
13 Sep - 20 Sep	FrenchBee
21 Sep - 28 Sep	SWISS
26 Sep - 03 Oct	Lufthansa
28 Sep - 05 Oct	Lufthansa
27 Sep - 04 Oct	Lufthansa

Also check the deals for one-way flights from San Francisco to Brussels in September.

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 San Francisco to Brussels in September from 554€

Return flights