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
22 Aug - 11 Sep	Iberia
24 Aug - 11 Sep	Iberia
20 Aug - 11 Sep	Iberia
25 Aug - 09 Sep	Air France
20 Aug - 03 Sep	Air France
18 Aug - 01 Sep	Air France
21 Aug - 04 Sep	Air France
22 Aug - 12 Sep	Air France
25 Aug - 12 Sep	Air France
13 Aug - 29 Aug	KLM
15 Aug - 29 Aug	KLM
11 Aug - 29 Aug	KLM
20 Aug - 27 Aug	Lufthansa
04 Aug - 18 Aug	KLM
05 Aug - 23 Aug	KLM
03 Aug - 23 Aug	KLM
04 Aug - 22 Aug	KLM
08 Aug - 22 Aug	KLM
03 Aug - 24 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 663€

Return flights