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

Return flights

29 Sep - 08 Oct	Lufthansa
30 Sep - 07 Oct	Lufthansa
28 Sep - 07 Oct	Lufthansa
28 Sep - 09 Oct	Delta
29 Sep - 06 Oct	SWISS
21 Sep - 30 Sep	Lufthansa
27 Sep - 07 Oct	United
19 Sep - 01 Oct	Aer Lingus
25 Sep - 02 Oct	Air France
29 Sep - 10 Oct	SWISS
22 Sep - 29 Sep	Lufthansa
21 Sep - 03 Oct	SWISS
20 Sep - 26 Sep	Aer Lingus
20 Sep - 24 Sep	Norse Atlantic Airways
19 Sep - 24 Sep	Norse Atlantic Airways
16 Sep - 23 Sep	Norse Atlantic Airways
17 Sep - 24 Sep	Norse Atlantic Airways (UK)
18 Sep - 25 Sep	Turkish Airlines
19 Sep - 30 Sep	Norse Atlantic Airways
16 Sep - 26 Sep	TAP	direct

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 468€

Return flights