Cheapest return flights from Seattle to Buenos Aires in January from $1227

AirHint found the following cheapest return flights from Seattle (SEA) to Buenos Aires (AEP) in January 2026 (see full year).

Return flights

01 Jan - 07 Jan Frontier Airlines
04 Jan - 07 Jan Frontier Airlines

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

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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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