1 liter = 35.19 fluid ounce (for UK) Related: How Many Ounces In A Gallon. How Many Ounces are in Half a Liter? The commonly used conversion from ounces to liters is very important to learn. Half of a liter of liquid is equal to 17.5975 fluid ounces which is about 16.907 US ounces. When we start with 1-liter conversion then 1 liter is equal to 35.197 fluid ounces. We can also say that it is equal to 33.814 US fluid ounces customary units.