AirHint found the following cheapest return flights from Frankfurt (FRA) to San Jose (SJO) in August 2026 (see full year).

Return flights

29 Aug - 19 Sep	Air France
25 Aug - 08 Sep	Air France
27 Aug - 08 Sep	Air France
29 Aug - 18 Sep	Air France
20 Aug - 17 Sep	Air France
20 Aug - 06 Sep	Air France
11 Aug - 08 Sep	KLM
25 Aug - 10 Sep	Iberia
27 Aug - 09 Sep	Air France
27 Aug - 07 Sep	Iberia
17 Aug - 30 Aug	KLM
24 Aug - 30 Aug	Air France
26 Aug - 31 Aug	United
05 Aug - 26 Aug	KLM
05 Aug - 22 Aug	KLM
25 Aug - 29 Aug	Air France
24 Aug - 31 Aug	Air France
16 Aug - 27 Aug	Air Canada
11 Aug - 29 Aug	KLM
11 Aug - 18 Aug	KLM

Also check the deals for one-way flights from Frankfurt to San Jose in August.

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 Frankfurt to San Jose in August from 614€

Return flights