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Notiochelidon cyanoleuca
averages 11–12 cm long and weighs about 10g.
cloudforest, 2400m
I spotted this around the HQ at Santuario Otun Quimbaya.
Thanks for the ID kel and the confirmation eelhsamrie and Ashley. Don't worry about it Ethical Environmentalist, no problem.
If you look at the link provided for Tree Swallow, it is not even found in South America.
I agree with Sckel. Although Tree Swallows are very similar in appearance, the Blue and White Swallow is more common in South America.