International passengers traveling to Boulder typically arrive at Denver International Airport (IATA code DEN), which is northeast of Denver, and 68 km/42 mi east of Boulder. Referred to as DIA, it is the largest international airport in the United States. Opened in 1995, the facilities and personnel have proven very efficient. It has earned a reputation for an excellent on-time record, and it was one of the first U.S. airports to integrate artwork.
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