Question Summary:
Protection against accidental death

Question Detail:

 
I am travelling for Umrah this month, for the safety of my family can i recite Surah Ahqaf and surah Tagabun individually on the behalf of my family members and blow on them in their absence by keeping them in my mind to be protected from calmity as i have heard  that these surah prevent from accidental death and accidents.
 

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
When undertaking a journey, one should recite the following dua:
سُبْحَانَ الَّذِي سَخَّرَ لَنَا هَذَا وَمَا كُنَّا لَهُ مُقْرِنِينَ وَإِنَّا إِلَى رَبِّنَا لَمُنْقَلِبُونَ 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 الأَهْلِ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ وَعْثَاءِ السَّفَرِ وَكَآبَةِ الْمَنْظَرِ وَسُوءِ الْمُنْقَلَبِ فِي الْمَالِ وَالأَهْلِ ‏"‏ ‏.‏
 
 
Translation:
O Allah, lighten this journey of ours, and make its distance easy for us. O Allah, Thou art (our) companion during the journey, and guardian of (our) family. O Allah, I seek refuge with Thee from hardships of the journey, gloominess of the sights, and finding of evil changes in property and family on return.
[MUSLIM: 425]
 
The duas mentioned in the Quran and Ahadith are most effective. You may also recite the Surahs you referred to as they may be tried and tested. 
 
And Allah Ta’āla Knows Best
Jibran kadarkhan
Student Darul Iftaa
Mauritius
Checked and Approved by,
Mufti Ebrahim Desai.