The best airport to fly into is going to be DIA (Denver International Airport) and is about 45 min to an hours drive to the venue and several nearby hotels right across the street.
Hotel
Staybridge Suites Denver South - Highlands Ranch by IHG
8211 Southpark Circle, Littleton, CO 80120 (303) 347-9901
Hotel
Hampton Inn & Suites Denver/Highlands Ranch
3095 W County Line Rd, Highlands Ranch, CO 80129 303) 794-1800
Hotel
Residence Inn Denver Southwest/Littleton
3090 West County Line Road, Littleton, CO 80129 (303) 791-3010
Hotel
Courtyard by Marriott Denver Southwest/Littleton
3056 West County Line Road, Littleton, CO 80129 (303) 791-3001