Frontier Airlines operates from Concourse D at Portland International Airport (PDX), offering passengers convenient access to its network of low-cost domestic routes. The Frontier Airlines PDX Terminal provides check-in counters, self-service kiosks, and friendly staff to assist with reservations, baggage, and travel inquiries. visit us: https://www.terminal-update.com/frontier-airlines/frontier-airlines-pdx-terminal-portland-airport/