Cheapest return flights from Seattle to Buenos Aires in December from $1601

AirHint found the following cheapest return flights from Seattle (SEA) to Buenos Aires (AEP) in December 2025 (see full year).

Return flights

15 Dec - 05 Jan Volaris
18 Dec - 07 Jan LATAM Airlines Group

Also check the deals for one-way flights from Seattle to Buenos Aires in December.

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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