The price of flights between both countries - as in most of the continent - multiply several times the price of doing it by bus, where you can also see the landscape and mix with the locals if you are not in a hurry and if you are patient. If what you value is comfort or you don't have much time, it will certainly compensate you more for flying.
In my case I took a bus from the Ecuadorian capital, Quito, which for 5 dollars took me to Tulcán. The road is full of curves that you can try to forget focusing on the beautiful landscape of greenery and mountains that offers the rugged orogrophy of the country.
About 5 hours later I arrived at the deserted terminal of Tulcán, where taxi drivers were already waiting eager to see if there was someone who wanted to cross the border of Rumichaca. I tried to negotiate the price with one of them but he told me - like 5 times - that the price was set at 3.5 dollars (for a journey of about 5 kilometers), just what was left loose. So I agreed and about 15 minutes later he left me at the Ecuadorian Immigration office.
To repeat the process of departure and entry: passport stamp of the country of departure, walk a few meters, entry stamp in the country of arrival. Important: never forget to put the exit stamp when you leave a country!
It was Saturday and the currency exchange office near the Colombian Immigration post was closed, so I had no choice but to get some change from the money changers who huddle near the taxis. It was not the best rate, but I changed only 20 euros to go pulling until I could find a cashier (there was none available at the border). They accept both US dollars - also official currency of Ecuador - and Euros.
After stamping my passport I took another taxi that took me to Ipiales, already in Colombia, just 3 kilometers from the border and almost obligatory stop for those who cross it by road. There are many people who, after the long day of buses and taxis, prefer to stay here and take the road the next day, but I chose to take a bus - a van shared with 10 or 12 more people - bound for Pasto, where I would spend a few days.
And here begins the series of articles that I will write about the fascinating Colombia. I hope that some help you and, above all, an incentive to visit this country.5.001