AirHint found the following cheapest return flights from London (LHR) to San Jose (SJO) in September 2025 (see full year).

Return flights

09 Sep - 24 Sep	Air Canada
09 Sep - 17 Sep	Air Canada
20 Sep - 05 Oct	Air Canada
19 Sep - 03 Oct	Air Canada
22 Sep - 28 Sep	Air Canada
30 Sep - 22 Oct	Air Canada
18 Sep - 03 Oct	Air Canada
26 Sep - 11 Oct	Air Canada
18 Sep - 10 Oct	Air Canada
11 Sep - 24 Sep	Air Canada
25 Sep - 28 Sep	Air Canada
30 Sep - 17 Oct	Air Canada
01 Sep - 17 Sep	Air Canada
10 Sep - 24 Sep	Air France
18 Sep - 24 Sep	Air France
10 Sep - 31 Oct	Air France
10 Sep - 22 Oct	Air France
12 Sep - 20 Sep	Air France
13 Sep - 26 Sep	Lufthansa
20 Sep - 04 Oct	Air Canada

Also check the deals for one-way flights from London to San Jose 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 London to San Jose in September from $747

Return flights