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

Return flights

30 Sep - 09 Oct	Austrian Airlines
20 Sep - 01 Oct	Air Canada
24 Sep - 01 Oct	Air Canada
30 Sep - 07 Oct	Air Canada
24 Sep - 08 Oct	Air Canada
22 Sep - 07 Oct	Air Canada
29 Sep - 15 Oct	Air Canada
21 Sep - 29 Sep	Air Canada
24 Sep - 29 Sep	Air Canada
25 Sep - 28 Sep	SWISS
21 Sep - 07 Oct	SWISS
22 Sep - 29 Sep	Austrian Airlines
21 Sep - 01 Oct	SWISS
22 Sep - 30 Sep	SWISS
30 Sep - 21 Oct	Aer Lingus
20 Sep - 30 Sep	Air Canada
23 Sep - 30 Sep	Air Canada
24 Sep - 30 Sep	Air Canada
23 Sep - 30 Sep	American Airlines	direct
22 Sep - 30 Sep	American Airlines	direct

Also check the deals for one-way flights from Los Angeles to London 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 London in September from $517

Return flights