Drivers crossing from Mexico into Arizona through the San Luis Port of Entry should prepare for potential delays this summer and fall as construction crews begin a new phase of a long-term border modernization project.
According to U.S. Customs and Border Protection, work is scheduled to begin June 20 at the San Luis I Port of Entry, where crews will install new equipment aimed at improving border operations and infrastructure. The project is expected to continue for four to five months.
Officials said the construction could lead to longer wait times for passenger vehicles entering the United States from Sonora, particularly during peak travel periods.
The border crossing in San Luis is Arizona’s westernmost port of entry and serves as a major gateway between the United States and Mexico. The San Luis I crossing handles passenger vehicles and pedestrians, while the nearby San Luis II facility is dedicated to commercial freight traffic and oversized vehicles.
Federal officials estimate that San Luis I processes approximately 3 million vehicles and 2.5 million pedestrians each year, making it one of the busiest border crossings in the region.
The upcoming work is part of a broader $356 million expansion and modernization project designed to increase capacity, improve security and streamline inspections. The overall project is expected to be completed in spring 2029.
Earlier this year, officials opened 16 new northbound vehicle inspection lanes at the crossing, a milestone that authorities said would help reduce congestion and improve traffic flow for residents, businesses and travelers who rely on the port.
While construction is underway, travelers are encouraged to allow extra time for border crossings and monitor traffic conditions before heading to the port of entry. Officials say the temporary inconvenience is intended to support long-term improvements that will enhance efficiency and accommodate growing cross-border traffic in the years ahead.
