Citi Card holder offer
10% off up to $250 when booking the Limited Time LUX Exclusive Hotel Offers with code CITI10
Limited Time LUX if you aren't familiar with the Luxury Escapes would usually be the headliner deals on the front page or at the top of your search, so the discount is basically on some of the best deal packages.
Tested the code on the Luxury Escapes website and it shows the discount immediately, I didn't go through to payment so no idea if this works if you try the code with a non Citi card.
Prestige Citi Card holder offers
If you hold a Prestige Citi Card then Code PRESTIGECITI10 will give 10% off up to $500.
Prestige Citi Card holders can also get 10% off on tours booked through Luxury Escapes using CITITOUR10.