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Denver International Airport explores $700M underground walkway conversion

May 27, 2026

Denver International Airport (DEN) is undertaking a new multimillion-dollar project to enhance passenger experiences and improve efficiency at one of the busiest airports in the nation. 

Plans are underway to convert a dormant underground tunnel into a new passenger walkway, enabling passengers to travel to all gates and terminals at DEN, airport officials told The Denver Post earlier this month. 

The project is estimated to cost up to $700 million, funded by airline and airport revenues, and it would provide an alternative route to the existing underground train system, which has seen an uptick in delays and breakdowns along its tracks. The proposed walkway would also offer a cheaper option for airport planners in comparison to new concourse bridges. 

Construction of the new walkway will likely not interfere with passenger operations at the airport as much of the active work would take place underground, according to city leaders. While there is not much detail on the project yet, initial estimates peg the new walkway at approximately 17 feet wide.  

Airport officials anticipate design work to begin this year with additional updates and estimates during the preliminary engineering and permitting phases of the project. 


Photo by Tony Webster, CC BY 2.0 https://creativecommons.org/licenses/by/2.0, from Wikimedia Commons

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Brady Pieper

written for various daily and weekly publications in Texas and Colorado, specializing in the government market and in-depth bill coverage. Graduating from the University of Texas at Austin with a degree in Journalism, Pieper has been at the forefront of public and private sector communications and government initiatives. Pieper recently joined the Government Market News team as a content writer and anticipates continuing SPI’s long-standing tradition of delivering timely, accurate and significant government news to our readers and partners.

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