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

Return flights

29 Sep - 16 Oct	Norse Atlantic Airways (UK)
22 Sep - 29 Sep	Lufthansa
22 Sep - 01 Oct	Air Canada
30 Sep - 15 Oct	Iberia
21 Sep - 30 Sep	Air Canada
23 Sep - 02 Oct	SWISS
23 Sep - 30 Sep	SWISS
22 Sep - 30 Sep	Air Canada
16 Sep - 24 Sep	Air Canada
17 Sep - 24 Sep	Iberia
10 Sep - 20 Sep	SWISS
28 Sep - 09 Oct	American Airlines
02 Sep - 11 Sep	Air Canada
18 Sep - 02 Oct	SWISS
10 Sep - 15 Sep	Air Canada
17 Sep - 14 Oct	British Airways
29 Sep - 13 Oct	British Airways
16 Sep - 23 Sep	Norse Atlantic Airways
24 Sep - 02 Oct	British Airways
27 Sep - 08 Oct	British Airways

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 $483

Return flights