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

Return flights

23 Sep - 30 Sep	SWISS
21 Sep - 01 Oct	SWISS
18 Sep - 02 Oct	SWISS
17 Sep - 22 Sep	Lufthansa
10 Sep - 16 Sep	Norse Atlantic Airways
02 Sep - 11 Sep	SWISS
02 Sep - 09 Sep	SWISS
07 Sep - 23 Sep	Norse Atlantic Airways (UK)
01 Sep - 15 Sep	Lufthansa
09 Sep - 21 Sep	Norse Atlantic Airways
02 Sep - 10 Sep	SWISS
01 Sep - 08 Sep	Lufthansa
09 Sep - 30 Oct	Norse Atlantic Airways
26 Sep - 06 Oct	Delta
26 Sep - 04 Oct	Delta
12 Sep - 03 Oct	Norse Atlantic Airways (UK)
26 Sep - 05 Oct	Norse Atlantic Airways
19 Sep - 03 Oct	Scandinavian Airlines
10 Sep - 31 Oct	Turkish Airlines
18 Sep - 03 Oct	SWISS

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 430€

Return flights