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

Return flights

17 Aug - 07 Sep	Avianca
24 Aug - 01 Sep	Avianca
10 Aug - 17 Aug	Air France
19 Aug - 01 Sep	KLM
27 Aug - 10 Sep	Air France
25 Aug - 08 Sep	KLM
24 Aug - 07 Sep	KLM
28 Aug - 11 Sep	KLM
21 Aug - 04 Sep	KLM
21 Aug - 01 Sep	KLM
26 Aug - 30 Aug	Air France
29 Aug - 12 Sep	Air France

Also check the deals for one-way flights from San Jose to Oslo 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 San Jose to Oslo in August from 727€

Return flights