If you're flying to Boulder, the nearest airport is the Denver International Airport (DEN), which is located about 40 miles southeast of Boulder's downtown area. To get to your selected destinations, it's best to rent a car or hail a ride from a ride-hailing platform. You can also take public transport such as buses or shuttles, depending on the location's accessibility.
If you have extra time, consider a visit to the Rocky Mountain National Park or the Flatiron Mountains, which provide scenic hikes and stunning scenery. You can also take a guided tour of nearby Celestial Seasonings Tea Factory, Avery Brewing Company, or Boulder Distillery. If you're short on time, consider skipping the Boulder Creek Trail and Leanin' Tree Museum of Western Art.
The Denver International Airport (DEN) is the nearest airport to Boulder and is located 40 miles southeast of the city. The airport's code is DEN, and the trip to downtown Boulder takes about an hour and a half via car or shuttle depending on the traffic.