AirHint found the following cheapest return flights from Sao Paulo (GRU) to Singapore (SIN) in September 2025 (see full year).

Return flights

21 Sep - 12 Oct	Air France
17 Sep - 24 Sep	Ethiopian Airlines
15 Sep - 15 Oct	Ethiopian Airlines
15 Sep - 23 Sep	Air France
04 Sep - 20 Sep	Ethiopian Airlines
18 Sep - 20 Sep	Ethiopian Airlines
01 Sep - 15 Sep	Copa
23 Sep - 28 Sep	Ethiopian Airlines
21 Sep - 25 Sep	Copa
23 Sep - 30 Sep	Copa
01 Sep - 30 Sep	Copa
22 Sep - 27 Sep	Copa
20 Sep - 04 Oct	Ethiopian Airlines
12 Sep - 03 Oct	Ethiopian Airlines
12 Sep - 04 Oct	Ethiopian Airlines
23 Sep - 02 Oct	Air France

Also check the deals for one-way flights from Sao Paulo to Singapore in September.

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.

Book a cheap hotel in Singapore

Cheap car rent in Singapore

Cheapest return flights from Sao Paulo to Singapore in September from $1263

Return flights