Prayer: What’s the prayer rule for leisure or necessity trips with no access to proper prayer space?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: What’s the prayer rule for leisure or necessity trips with no access to proper prayer space?

English:

Question #679:

What is the rule that applies to a picnic made for pleasure, or a journey for purchasing the necessities of life, supposing that one will have no access during the journey to a place for praying or carrying out its preliminaries?

Answer #679:

If he knows that he will have to forsake a prayer obligation during the journey, it is a caution to refrain from such a trip unless that results in harm or causes an unbearable hardship. Anyhow, it is impermissible to neglect one’s prayer for any reason.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer