Journey (N):

–> Go from one place or another (long duration), usually without planning to go back.

Example: My journey to Finland took 16 hours with 4-hour layover.

Travel (N/V):

–> Go from one place to another ( long duration), with plans of coming back.

Examples:

I’m gonna travel to Europe for a month and a half, don’t bother calling me.
My travels in the 81 provinces of the Philippines will be published.

Trip:

–> Travel in short duration.

Example:

I’m gonna go on a trip to Thailand so see you next week.