Whenever you fly into the US and cross through a border check, you have the risk of a warrant showing up and getting arrested. You can either wait until you fly into the US and see what happens, or you could hire a lawyer to research the warrant issue, enter an appearance for an out-of-country client, negotiate a lifting of the warrant, and a surrender date for after you return to the country. As to the seriousness of the charges being enough to warrant an arrest at the border, given the type of record checks being done on in-coming flights, you should assume that if there is a warrant they will at least be aware of it.
DISCLAIMER Since I do not practice law in your State, this answer is provided solely for informational purposes only, for you to use as a starting point when speaking directly with a lawyer in your State. This answer does not constitute legal advice, create an attorney-client relationship, or constitute attorney advertising. I urge you to immediately contact an experienced criminal defense lawyer admitted to practice law in your State before you make any decisions about this case.