Flight
The closest airport for Boulder is the Denver International Airport (DEN).
Travel Note
If you're like us, you can rock a public transit system, but here are the deets: BUS: You can easily hop a bus to Boulder from DIA (local lingo for the airport). To get to downtown Boulder, you'll take the AB bus. The bus costs $13 cash (exact fare required) which can be paid when you board the bus. You'll follow signs to Ground Transportation and hop on this direct bus to Boulder. The downtown Boulder station is the very last stop, so if that's where you're headed, you can snooze the whole way ;)
Travel Note
If you're looking to take a direct ride to Boulder, it will usually cost about $60-75 for 4 riders. Haven't used Lyft before? Use this link to download the app and set up your account prior to touchdown.
House Or Rental
Have you tried AirBnb? If not, you should check out some of the great little houses in Boulder and feel like a local for the weekend :)