Cheapest one-way flights from Seattle to Buenos Aires in January from $510

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

One-Way flights

29 Jan Frontier Airlines
24 Jan Hawaiian Airlines
31 Jan Hawaiian Airlines
21 Jan LATAM Airlines Group
27 Jan LATAM Airlines Group
30 Jan LATAM Airlines Group
18 Jan LATAM Airlines Group
03 Jan LATAM Airlines Group
06 Jan LATAM Airlines Group
09 Jan LATAM Airlines Group

Also check the deals for return 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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