Cheapest one-way flights from Seattle to Buenos Aires in April from $674

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

One-Way flights

30 Apr LATAM Airlines Group
06 Apr LATAM Airlines Group
09 Apr LATAM Airlines Group
27 Apr LATAM Airlines Group
12 Apr LATAM Airlines Group
15 Apr LATAM Airlines Group
21 Apr LATAM Airlines Group
18 Apr LATAM Airlines Group
03 Apr LATAM Airlines Group
24 Apr LATAM Airlines Group

Also check the deals for return flights from Seattle to Buenos Aires in April.

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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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