NYC to Buenos Aires
 

Want to fly there this July for a 14 day trip
Are certain days in the week better to book for fares or seats?
Is one part of the month busier than others?Thanks for advice

I would use Google flights, set up a few alerts with airlines within the network that you prefer to fly with. You can view how to do this by just googling how to set up a Google flight alert. Then you’ll be getting automatic emails for the dates and flights you have selected, and when the price seems right for you book it then. A window this far out unless it’s a sale fare May be a little pricey. Just search around and you’ll get a feeling real quick. Most of the good deals I find are around three months out of your day to travel. Best of luck, and enjoy your time in Buenos Aires

I love July in Argentina! It's blazing hot in Chicago and winter in Buenos Aires. I wear a windbreaker and feel great there in July!

Enjoy....

I think July is relatively expensive.
It is the summer break in the US and lots of families travel "back home" during the Northern summer.
Any of the search engines lets you plug in "best available dates" option
I prefer this search engine - I know it is a little outdated but very user friendly
matrix.itasoftware.com