Guide de ville
Denver DEN: What to Do on a Layover
16th Street Mall in 3 hours: Rocky Mountain craft IPA, red rocks postcard, 5,280ft.
Getting from the airport
DEN to city center: 37 minutes by rail (RTD A Line). Fare is $10. Trains run every 15 minutes. Service runs 04:30 to 01:30. Skip the taxi unless your connection is under 5 hours.
What to do in Denver
The stops worth making: Red Rocks Amphitheatre, Rocky Mountain National Park day trip, 16th Street Mall, Denver Art Museum. Rated above 4.4: Coors Field (4.7), Denver Zoo (4.6), Denver Botanic Gardens (4.8), Denver Museum of Nature & Science (4.7), Meow Wolf Denver's Convergence Station (4.5). You do not need the full tourist circuit. Pick two and commit.
Visa and entry
Denver is visa-free for US passports. No application, no fee. The border process at DEN is standard. Budget 30 minutes.
How long do you need
The minimum useful layover is 5 hours. That gives you 37 minutes in each direction plus about 136 minutes on the ground. Up to 24 hours is a proper overnight.
DEN airport
DEN has 10 lounges. For short connections under 4 hours, the terminal is the destination: food options, showers, and enough space to reset before the next leg.