AirHint found the following cheapest return flights from Frankfurt (FRA) to San Jose (SJO) in August 2025 (see full year).

Return flights

29 Aug - 29 Sep	Air France
30 Aug - 25 Sep	Air France
25 Aug - 10 Sep	Air France
18 Aug - 07 Sep	United
12 Aug - 09 Sep	United
12 Aug - 07 Sep	United
21 Aug - 11 Sep	United
26 Aug - 16 Sep	United
18 Aug - 03 Sep	United
26 Aug - 14 Sep	United
12 Aug - 28 Aug	United
18 Aug - 28 Aug	United
25 Aug - 28 Aug	United
17 Aug - 28 Aug	United
06 Aug - 17 Aug	Air Canada
07 Aug - 17 Aug	Air Canada
18 Aug - 24 Aug	KLM
12 Aug - 19 Aug	KLM
18 Aug - 31 Aug	United
12 Aug - 26 Aug	United

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 524€

Return flights