AirHint found the following cheapest return flights from Madison (MSN) to Sao Paulo (GRU) in December 2025 (see full year).

Return flights

23 Dec - 15 Jan	LATAM Airlines Group
10 Dec - 14 Jan	American Airlines
23 Dec - 23 Jan	LATAM Airlines Group
23 Dec - 12 Jan	LATAM Airlines Group
22 Dec - 29 Dec	LATAM Airlines Group
18 Dec - 25 Dec	LATAM Airlines Group

Also check the deals for one-way flights from Madison to Sao Paulo in December.

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 Madison to Sao Paulo in December from $1085

Return flights