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

Return flights

28 Sep - 05 Oct	Spirit Airlines
27 Sep - 05 Oct	Spirit Airlines
24 Sep - 28 Sep	Volaris Costa Rica
30 Sep - 07 Oct	Spirit Airlines
23 Sep - 02 Oct	Spirit Airlines
24 Sep - 05 Oct	Spirit Airlines
19 Sep - 27 Sep	Spirit Airlines
21 Sep - 04 Oct	Spirit Airlines
15 Sep - 21 Sep	Avianca
19 Sep - 28 Sep	Spirit Airlines
18 Sep - 25 Sep	Copa
15 Sep - 29 Sep	Spirit Airlines
16 Sep - 25 Sep	Spirit Airlines
16 Sep - 07 Oct	Spirit Airlines
18 Sep - 01 Oct	Iberojet
18 Sep - 29 Sep	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 550€

Return flights