The Spanish Autovía A-21 is a highway between Jaca, in Aragon, and Iruña/Pamplona, in Navarre which is partially open and partially under construction.
It follows or is an upgrade of the N-240 and links the Autovía A-15 east of Iruña/Pamplona with the Autovía A-23 at Jaca providing a link through the southern Pyrenees and connections to France, Huesca and Zaragoza.
Phases Construction began at the Iruña/Pamplona end of the route, so while the sections in Navarre were completed by 2012, only seven out of the eight sections in Aragon (totaling about 38 km) are open. Work has not yet started on one further section (11.6 km). Seven financial institutions funded the construction of the highway. Road Number Description Status (2025) KilometresA-21 Noain - Elo/Monreal Open (2006) 12 A-21Elo/Monreal - Izko Open (2009) 8.6A-21 Izko - Judasen Benta/Venta de Judas Open (2010) 7.2A-21 Judasen Benta/Venta de Judas - Esa/Yesa Open (2012) 10A-21 Esa/Yesa- Border of Navarre/Aragón Open (2012) 6.5A-21 Border of Navarre/Aragón - Tiermas Open (2013) 4.4 Tiermas - Sigüés Open (2025) 6.57 Sigüés - A-1601 Open (2015) 2.5A-21 A-1601 - Barranco de Colladas Open (2011) 2.9A-21 Barranco de Colladas - Fago (Border of Zaragoza/Huesca) Open (2011) 5.4 Fago (Border of Zaragoza/Huesca) - Puente la Reina de Jaca Project halted 11.63 Puente la Reina de Jaca - Santa Cilia Open (2019) 7.2A-21 Santa Cilia - Jaca (A-23) Open (2019) 9.0
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