AirHint found the following cheapest return flights from Los Angeles (LAX) to Madrid (MAD) in September 2026 (see full year).

Return flights

20 Sep - 29 Sep	Finnair
23 Sep - 30 Sep	Brussels Airlines
20 Sep - 06 Oct	Brussels Airlines
21 Sep - 07 Oct	British Airways
20 Sep - 30 Sep	Finnair
20 Sep - 02 Oct	British Airways
28 Sep - 13 Oct	British Airways
16 Sep - 29 Sep	Air Canada
30 Sep - 18 Oct	Brussels Airlines
23 Sep - 03 Oct	Brussels Airlines
24 Sep - 02 Oct	British Airways
17 Sep - 01 Oct	Finnair
01 Sep - 15 Sep	Finnair
20 Sep - 30 Sep	Aer Lingus	direct
20 Sep - 29 Sep	Finnair	direct
20 Sep - 06 Oct	Finnair	direct
23 Sep - 30 Sep	Aer Lingus	direct
02 Sep - 30 Sep	Lufthansa
28 Sep - 13 Oct	Finnair	direct
02 Sep - 11 Sep	Lufthansa

Also check the deals for one-way flights from Los Angeles to Madrid 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 Madrid in September from $411

Return flights