Agreement between Port of Miami-Dade and the Santander Port Authority. Date: 29 April 1999
Twinning agreement between Freeport of Riga and the Santander Port Authority. International twinning agreement to formalise mutual collaboration in the setting up, development and, if applicable, the execution of initiatives that both parties agree to. Date: 8 May 2001
Collaboration agreement between Empresa Portuaria Nacional de Santo Tomás de Castilla de la República de Guatemala and the Santander Port Authority. Date: 28 September 2005
Collaboration agreement between Administración Portuaria Integral de Veracruz, S.A. of C.V. and the Santander Port Authority. Date: 13 October 2005
Atlantic Port Authority (JAPDEVA). Date: 2 November 2005
International twinning agreement between Empresa Portuaria de Valparaíso and the Santander Port Authority. Date: 6 October 2006
Agreement between the Atlantic Port Authority (JAPDEVA) and the Santander Port Authority. Date: 18 December 2006
International twinning agreement between Autoridad Portuaria San Antonio (Chile) and the Santander Port Authority. Date: 16 January 2007
International twinning agreement between Autoridad Portuaria Regional del Estado de Zulia and the Santander Port Authority. Date: 12 April 2007