Go to the one located in the intl terminal, Great place to sleep outside if you need to catch an early flight to phu quoc, the chairs make good beds and the staff don't mind.
What a way to say goodbye to your visitors Vietnam. Absolutely overpriced. And this is the only café I saw. Just Vietnam's last chance to squeeze some more money out of a tourist.
There's hardly any options at the international gates so I'm guessing you'll be stuck here just like I was. Coffee is terrible, space is cramped. Skip.