Correct spelling, explanation: nouns ending with consonant y have two ways of creating plural form: if there is a consonant before y it transforms to ie (for example fly → flies); if there is a vowel before y we add s to the end of the word, just as in regular nouns (for example boy → boys or journey → journeys). This is why the correct plural form of journey is journeys, not journies.

Definition of journeys:
noun, plural form of journey, travel from one place to another, usually, in a touristic manner
I love journeys, especially to distant and wild places.
Journeys don’t have to be expensive, you just have to plan them well.

Incorrect spelling, explanation: this spelling is a mistake since its irregular way of creating plural form, while the word journey has a regular plural form: journeys. When we want to make a plural form from a noun ending with y proceeded by a vowel we use a regular s. In the case of a consonant before the final y we have an irregular ies form (for example duty → duties). Therefore journies is an incorrect spelling and the correct one is journeys.