Is the phrase a x-ray correct or an x-ray?

Answer 1

You would say "an x ray," Because it is pronounced "Ex Ray."

Phonetically, an x-ray is the correct way. Since x-ray is a special case and sounds like it has the "e" vowel at the beginning, an would be the appropriate article. This avoids a glottal stop when speaking.

Here is a Wikipedia article regarding this question:wikipedia.org/wiki/English_articles#Discrimination_between_a_and_an

Answer 2

An x-ray (although X is not a vowel, the pronunciation of the X sounds as a vowel. So if you try to pronounce "a x-ray" would sound terrible. Correct "An x-ray).