Bus Service RTD skyRide . Exact fare is required on boarding the bus . Travel time to the Boulder bus station is approximately 80 minutes. Counters are located in the Ground Transportation area of the Main Terminal building. If you plan to pick up a car at DIA, or one in Boulder after the Congress, be sure to make reservations well in advance , particularly to qualify for any special fares.
Late summer is a very busy time for tourism in the Rocky Mountain region.
Companies often are sold out of standard cars days or weeks in advance. I-70 and US 36 is longest but less prone to getting lost. Taxis Taxis are expensive because of the 45-mile distance. Practical only if cost is split by sharing the ride.