When traveling to Columbia as a tourist, a United States citizen may stay in the country for a maximum of 60 days without the need for a visa. You may be required to present proof of a round trip plane ticket to support evidence of onward travel. Should you enter Colombia via land, you must ensure that you are entering the country in an official border entry point. Not doing so may cause for fines and even deportation.
Upon arrival, the Colombian Immigration will determine the length of stay for your visa, and shall stamp your passport accordingly. Should you wish for an extension, this may be applied for through the Departamento Administrativo de Seguridad, or DAS. Fines are applicable should you overstay in the country, and you will not be able to exit Colombia until those fines are paid.
Remember that if you possess a visa that has more than three months’ validity, you must ensure that you register it wish DAS upon your arrival in Colombia. Likewise, a corresponding fine will be applicable if this is not done so in 15 days or less.
An exit tax in the airport is applicable when you leave the country, but may have been factored in through your airline ticket as well. A good practice would be to check with your airline prior to traveling.
For dual citizens, you must need to present your Colombian passport when entering and exiting the country. You would also need your US passport upon entry in the United States.
For more information, you may reach:
The Colombian Embassy
2118 Leroy Place NW
Washington, DC 20008
Telephone: (202) 387-8338
There may also be consulate offices in your states or those that are near yours. You may check with the Colombian Embassy regarding the locations and contact numbers.