Is it possible to get alarplasty on one nostril to make nose more symmetrical? (Photo)

The nostril asymmetry may be as the result of nasal deviation as well as facial asymmetry. I can see that your right nostril is slightly more retracted making the left side appear more straight and long. In person consultation should determine the actual reason for this. 

It is absolutely possible to bring in your left nostril to improve symmetry; best technique is to use the internal nares wedge excision; the placement of this incision is critical and requires exact measurements of the two nostrils. This procedure can also be done in the office with no general anesthesia which will save you money.

Yes, if your nostrils are not the same, only one side can be addressed to gain symmetry though sometimes they are thus because the septum is deviated. 

Hi Sasha, It appears that there could be asymmetry in your face as well as a deviation of the nose.  You will want to consult with a board certified plastic surgeon to have an evaluation to determine the best strategy to create a more symmetrical nose. Best wishes.