Colombian immigration laws permit a maximum stay of 6 months per year as a tourist. Visitors of most countries do not need a visa in advance but get the visa stamped into their passport upon arrival. Be aware that the immigration officer decides about the initial period of your stay: 30, 60 or 90 days. If you plan to stay more than one month you should advise the officials on arrival - before your passport gets stamped! - If you wish to stay longer than the period authorized on your initial entry stamp you should go to an immigration office and ask for an extension. Do this in time, a few days before your visa expires as there is some paperwork involved: You might have to give fingerprints and you will have to pay a fee of roughly USD 40 to a bank account. Be aware that Colombian authorities are very strict with these dates - Whenever you pass your maximum stay you will be fined before you can leave the country!
If you need a visa extension in Cartagena you will have to go to the foreigners department of local DAS office in the "Pie de la Popa" neighbourhood.
Immigration Office Cartagena:
DAS (Departamento Administrativo de Seguridad)
Extranjería
Carrera 20 B No. 29-18 Pie de la Popa
Tel: 6568003 - 6560646 - 6562524- 6664665
Open from 8-12 and 2-5, monday through friday.