We'll be there in February 2023. On arrival day at BA (EZE) mid morning, we will take Aerolineas 6 pm from AEP - IGR and return 5pm next day. Roundtrip is US$230 pp, it offers some flexibility to change flights and includes carry-on and check-in bag. The low cost airlines Flybondi and JetSmart have lower base fare but they charge extra fees for everything like seats, bags, carryon, check-in etc. Too confusing to deal with and there are many reviews about flights being cancelled without advance notice. We plan to taxi from airport to hotel, hotel to the Falls and back to airport, budgeting $20 each way. We will wait till we get there to buy tickets to enter Iguazu. Will be there in line before ticket booths open. I read about entry fee is lower at the gate than buying online in advance. The advance purchase is a voucher to exchange for ticket at the gate, so you still have to wait in line to get entry ticket. Hotel is about $100 for 3 people, we booked few months ago but same hotel is more than double the cost now. Our other family members are not crazy enough to do this hectic overnight excursion, they'll sightsee in BA before cruise.