AirHint found the following cheapest return flights from San Jose (SJC) to Lisbon (LIS) in September 2025 (see full year).

Return flights

28 Sep - 06 Oct	British Airways
30 Sep - 08 Oct	British Airways
09 Sep - 17 Sep	British Airways
20 Sep - 24 Sep	Hawaiian Airlines
09 Sep - 16 Sep	British Airways
26 Sep - 04 Oct	British Airways
27 Sep - 04 Oct	British Airways
17 Sep - 25 Sep	KLM
25 Sep - 03 Oct	KLM
19 Sep - 27 Sep	British Airways
14 Sep - 22 Sep	British Airways
12 Sep - 19 Sep	British Airways
12 Sep - 20 Sep	British Airways
08 Sep - 15 Sep	KLM
17 Sep - 24 Sep	Finnair
25 Sep - 02 Oct	KLM

Also check the deals for one-way flights from San Jose to Lisbon 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 Jose to Lisbon in September from 623€

Return flights