Cheapest return flights from St. Louis to Sao Paulo in September from $680

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

Return flights

12 Sep - 16 Sep Frontier Airlines
06 Sep - 09 Sep Frontier Airlines

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

Skyscanner

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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