AirHint found the following cheapest return flights from Los Angeles (LAX) to Lisbon (LIS) in September 2025 (see full year).

Return flights

30 Sep - 07 Oct	LEVEL
30 Sep - 08 Oct	SWISS
30 Sep - 15 Oct	LEVEL
15 Sep - 23 Sep	LEVEL
18 Sep - 23 Sep	LEVEL
23 Sep - 29 Sep	Air Canada
09 Sep - 16 Sep	LEVEL
29 Sep - 16 Oct	SWISS
02 Sep - 08 Sep	SWISS
30 Sep - 10 Oct	LEVEL
17 Sep - 23 Sep	SWISS
24 Sep - 30 Sep	SWISS
21 Sep - 30 Sep	American Airlines
19 Sep - 25 Sep	Norse Atlantic Airways
23 Sep - 01 Oct	British Airways
15 Sep - 21 Sep	LEVEL
30 Sep - 10 Oct	TAP	direct
30 Sep - 07 Oct	TAP	direct
14 Sep - 03 Oct	TAP	direct
30 Sep - 06 Oct	Air Canada

Also check the deals for one-way flights from Los Angeles 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 Los Angeles to Lisbon in September from $477

Return flights