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

Return flights

28 Sep - 04 Oct	Spirit Airlines
27 Sep - 04 Oct	Spirit Airlines
05 Sep - 24 Sep	Avianca
21 Sep - 04 Oct	Spirit Airlines
05 Sep - 15 Sep	Avianca
11 Sep - 15 Sep	Spirit Airlines
08 Sep - 15 Sep	Avianca
05 Sep - 12 Sep	Volaris Costa Rica
05 Sep - 14 Sep	Avianca
17 Sep - 01 Oct	Spirit Airlines
20 Sep - 04 Oct	Avianca
12 Sep - 20 Sep	Spirit Airlines
03 Sep - 23 Sep	Avianca
18 Sep - 09 Oct	Iberojet

Also check the deals for one-way flights from San Jose 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 San Jose to London in September from 512€

Return flights