Chill Skybar is the first "skybar" established in Saigon. The rooftop bar is on the 26th floor of the New World Building which is situated centrally in District 1. It has an indoor lounge and an outdoor bar. This rooftop bar is very nice and upscale. Certain attire will only get you in during night time.
If you're looking for more of a relaxed experience, check out the place during happy hour. It is between 17:30-20:00 where the drinks and some appetizers are half off. This is a great place to watch the sunset as you sip on some drinks. Plus, the view is gorgeous!
You won't need any reservations if you come in a couple minutes before happy hour starts to snag a table. Otherwise, call ahead to reserve a table.