Here are some essential duas to say when beginning a journey and upon your return.
Allah is the greatest, Allah is the greatest, Allah is the greatest, How perfect He is, The One Who has placed this (transport) at our service, and we ourselves would not have been capable of that, and to our Lord is our final destiny.
O Allah, we ask You for birr and taqwaa in this journey of ours, and we ask You for deeds which please You.
O Allah, facilitate our journey and let us cover its distance quickly. O Allah, You are The Companion on the journey and The Successor over the family, O Allah, I take refuge with You from the difficulties of travel, from having a change of hearts and being in a bad predicament, and I take refuge in You from an ill fated outcome with wealth and family.