The Lisbon Metro's new Circular Line (Linha Circular) is scheduled to begin passenger operations in the first quarter of 2027. Secretary of State for Mobility Cristina Pinto Dias told parliament that while the project will open under its current layout, the government remains open to eventually connecting it into a loop line (Linha em Laço). Converting the route immediately would cost an extra €18 million and delay the opening by 18 months.
Lisbon Metro Circular Line to Open in 2027

Context & Explainers
The Circular Line (Linha Circular) is a major infrastructure project designed to connect the Yellow and Green lines of the Lisbon Metro, creating a loop through the city center. Once completed, this project aims to improve transit efficiency by allowing trains to circulate continuously rather than terminating at end-of-line stations.
Cristina Pinto Dias is Portugal's Secretary of State for Mobility (Secretária de Estado da Mobilidade). A transport manager who previously held executive roles in Portuguese public transit and rail administration, she oversees urban transport networks, metro expansions, and national transit strategy.
4 sources
- Government admits to studying 'laço' connection after opening circular lineobservador.pt ·
- Government admits to reconciling Lisbon Metro's Circular Line with a Loop Linecmjornal.pt ·
- OE2027: Government admits to reconciling Lisbon Metro Circular Line with Loop Linedn.pt ·
- Government admits to reconciling the Lisbon Metro Circular Line with the Loop Linepublico.pt ·






