Visitors to Cuba from almost every country, including the United States, need a Cuban Tourist Card (sometimes called a Cuba Visa) to enter the country. When traveling on Southwest, this is how you get one.
The following guidelines are for those who have purchased airline tickets to Cuba on Southwest. If you’re traveling on a different airline, one of the following articles will be more helpful:
If you're flying from the US, make sure you purchase a pink tourist card. The color signifies that you are entering Cuba from the United States, which you definitely will be if you are traveling on Southwest. No matter your country of origin, you need a pink tourist card when flying between the U.S. and Cuba. If you're flying directly to Cuba from outside the US (which Southwest doesn't do), you need a green card.
Southwest recommends purchasing your Tourist Card in advance from Cuba Visa Services. You can order it online or by phone and have it delivered to your US address. If you don’t purchase your visa in advance, you can purchase it at CTS counters in the aiport. But as Southwest recommends
Once you have your Tourist Card, fill it out completely and neatly. Don’t lose it! Treat it just like you would your passport. You’ll need it to enter and exit Cuba.