I am starting my one year trip through South America in a month, and the country I fly into is Colombia. Since I do not need a visa for Colombia and the surrounding countries, I assumed it should be no problem entering on a one way ticket. But a research on the Internet got me worried. It seems that Colombian immigration officers normally do not ask for return/onward tickets, but they might. And the airlines are even more prone to cause me troubles. Is it still the case in 2019?

I am an EU citizen. I will be flying from Madrid to Bogota with Avianca airlines. I intend to stay in Colombia for 1-2 months, and then travel overland to Equador with the local busses.