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

Return flights

22 Aug - 12 Sep	Iberia
20 Aug - 10 Sep	United
17 Aug - 31 Aug	Iberia
21 Aug - 12 Sep	United
18 Aug - 03 Sep	United
20 Aug - 27 Aug	United
12 Aug - 31 Aug	Air Canada
15 Aug - 05 Sep	KLM
04 Aug - 22 Aug	KLM
04 Aug - 25 Aug	KLM
18 Aug - 01 Sep	Air France
21 Aug - 11 Sep	United
11 Aug - 01 Sep	KLM
13 Aug - 01 Sep	KLM
12 Aug - 27 Aug	United
08 Aug - 08 Sep	Ryanair
13 Aug - 31 Aug	Iberia
10 Aug - 31 Aug	Iberia
11 Aug - 31 Aug	Iberia
11 Aug - 21 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 701€

Return flights