Q: Salaah-115: What is the ruling regarding the Sunnah salaahs when travelling? Should they be performed or not?

Answer: The Sunnah salaahs will not be shortened and while actually, travelling, it is necessary to consider the other travellers as well. There will therefore be no harm in omitting the Sunan during this time. However, when at one's destination or when one has ample time during the journey. They should not be omitted.

Fatawa Rahimiyyah vol.2