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

Return flights

10 Sep - 21 Sep	ANA
01 Sep - 25 Sep	Japan Airlines
05 Sep - 18 Sep	Japan Airlines
05 Sep - 19 Sep	Japan Airlines
05 Sep - 20 Sep	Japan Airlines
07 Sep - 20 Sep	Japan Airlines
06 Sep - 20 Sep	Japan Airlines
05 Sep - 21 Sep	Japan Airlines
06 Sep - 18 Sep	Japan Airlines
04 Sep - 18 Sep	Japan Airlines
19 Sep - 17 Oct	LATAM Airlines Group
22 Sep - 07 Oct	Ethiopian Airlines
22 Sep - 01 Oct	Ethiopian Airlines
29 Sep - 14 Oct	Ethiopian Airlines
17 Sep - 01 Oct	Ethiopian Airlines
28 Sep - 09 Oct	Ethiopian Airlines
30 Sep - 14 Oct	Ethiopian Airlines
22 Sep - 04 Oct	Ethiopian Airlines
26 Sep - 15 Oct	Ethiopian Airlines
22 Sep - 17 Oct	Ethiopian Airlines

Also check the deals for one-way flights from Sao Paulo to Bangkok 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.

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Cheapest return flights from Sao Paulo to Bangkok in September from $1059

Return flights