Cheap flights from Boston to Buenos Aires from $313

The cheapest month to fly to Buenos Aires from Boston is in June. Flight prices, which tend to average around $279, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of June, then book flights to Buenos Aires from Boston during February instead. Flights to Buenos Aires in February, while not as cheap as those in June, still average around $302.

You are more likely to see cheaper flights to Buenos Aires from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Buenos Aires for around $1,238 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Buenos Aires from Boston for as low as $880 on momondo.

You could potentially save up to 39% on your flight if you consider stops on a Boston to Buenos Aires flight.

As of May 2026, prices for Boston to Buenos Aires flights are approximately 75% cheaper when compared to flights at the same time last year.

Arajet, American Airlines, and LATAM Airlines are the most popular carriers operating from Boston Logan Intl to Buenos Aires

American Airlines, LATAM Airlines and Delta are the top three most popular airlines that fly to Buenos Aires from Boston according to our data. American Airlines is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Buenos Aires. Keep in mind that there are 6 different airlines that fly to Buenos Aires on a routine basis, so you have a few additional options to choose from.

Miami (MIA) was the most common stop: 45% of momondo users choosing 1-stop flights on this route connected there.

Flights via Sao Paulo (GRU) offer the lowest average round-trip price of $1,025.

Flights connecting via New York (JFK) have the shortest average one-way travel time: 13h 22m.

Sao Paulo (GRU) has the shortest average layover time for this route: 1h 30m.