Du'a as you begin your travel: Allah is the Greatest

اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ اللَّهُمَّ إِنَّا نَسْأَلُكَ فِي سَفَرِنَا هَذَا الْبِرَّ وَالتَّقْوَى وَمِنَ الْعَمَلِ مَا تَرْضَى اللَّهُمَّ هَوِّنْ عَلَيْنَا سَفَرَنَا هَذَا وَاطْوِ عَنَّا بُعْدَهُ اللَّهُمَّ أَنْتَ الصَّاحِبُ فِي السَّفَرِ وَالْخَلِيفَةُ فِي الْأَهْلِ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ وَعْثَاءِ السَّفَرِ وَكَآبَةِ الْمَنْظَرِ وَسُوءِ الْمُنْقَلَبِ فِي الْمَالِ وَالْأَهْلِ وَالْوَلَدِ

Allahu akbar, Allahu akbar, Allahu akbar. Allahumma inna nas'aluka fi safarina hadhal-birra wat-taqwa, wa minal-'amali ma tarda. Allahumma hawwin 'alayna safarana hadha watwi 'anna bu'dah. Allahumma antas-sahibu fis-safari wal-khalifatu fil-ahl. Allahumma inni a'udhu bika min wa'tha'is-safari wa ka'abatil-manzari wa su'il-munqalabi fil-mali wal-ahli wal-walad

Allah is the Greatest, Allah is the Greatest, Allah is the Greatest. O Allah, we ask You in this journey of ours for righteousness and piety, and for deeds that 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 gloomy sight and a bad predicament, and I take refuge in You from an ill-fated outcome in wealth, family, and children.

Ṣaḥīḥ Muslim 1342 (part), with "and children" as in Jāmiʿ al-Tirmidhī 3447