Visa & Passport
Citizens of most western countries, including most European countries, all South American nations, Panama, Costa Rica, Honduras, El Salvador, Guatemala, Belize, Mexico, the United States, Canada, Australia, New Zealand, Solomon Islands, Fiji, Papua New Guinea, Indonesia, Brunei, Philippines, Taiwan, South Korea, Bhutan, Japan, Malaysia and Singapore don't need a visa, unless they are staying for more than 90 days. Irish citizens no longer need to apply for a visa at a Colombian embassy, and should have the same treatment at immigration as any other visa-free travelers.
Colombian authorities will stamp passports from the above countries giving permission to stay for a maximum of 30 to 90 days. Immigration officials at any of the international airports of the country will usually ask you the intended length of your trip, giving you a determinate number of days that will cover it, which you can extend to 90 by going to any immigration services office.
Extending your stay
You can apply for a 90-day extension to your stay at an Asuntos Migratorios office in some of the major cities, which costs around 40.00 USD. You need two copies of your passport's main page, two copies of the page with the entrance stamp, two copies of a ticket en route out of the country, and four photographs. The procedure takes some time and includes taking your fingerprints. For visitors, the maximum length of stay can not exceed 6 months in 1 year.