November is the sweet spot for Charleston. The heavy summer humidity finally breaks, the historic downtown streets are actually comfortable to walk, and room rates ease up a bit before the December holidays. You get cooler coastal air, long afternoons touring old houses, and fresh seafood without fighting massive crowds.
When you are looking at a $1900 price tag for the whole trip, breaking it into chunks helps keep things manageable. Here is how to plan the timing and pay for it without scrambling.
Remember that the intro window is a deadline, not free money. If you still have a balance left when those 15 months are up, regular interest charges will kick in on what you owe.