Go here: https://www.iberia.com/es/iberiaplus...lights/iberia/
Click "see usage table"
JFK-MAD is band 5, MAD-BIO is band 1
Depending on whether your flight is peak or off-peak, there are two different tables
If you're flying in Blue/Azul (discount reward economy) it'll be 17+4.5=21.5k off-peak, or 20+5=25k in peak season
Peak season for Iberia is basically summer (mid-June to mid-September) plus any weekends located around Spanish public holidays.