AirHint found the following cheapest return flights from San Jose (SJC) to Singapore (SIN) in August 2025 (see full year).

Return flights

24 Aug - 03 Sep	Japan Airlines
26 Aug - 03 Sep	Japan Airlines
10 Aug - 17 Aug	Korean Air
19 Aug - 26 Aug	Korean Air
06 Aug - 27 Aug	Korean Air
21 Aug - 03 Sep	Korean Air
24 Aug - 04 Sep	Korean Air
21 Aug - 02 Sep	Korean Air
16 Aug - 04 Sep	China Airlines
11 Aug - 16 Aug	Korean Air
25 Aug - 01 Sep	China Airlines

Also check the deals for one-way flights from San Jose to Singapore 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 Singapore in August from $834

Return flights