What to say upon returning from a journey
 

From every elevated point say three times:

ا للهُ أَكْـبَر، ا للهُ أَكْـبَر، ا للهُ أَكْـبَر

Allaahu 'Akbar 

Allah is the Most Great 

And then recite:

لا إلهَ إلاّ اللّهُ وَحْـدَهُ لا شريكَ لهُ، لهُ الملكُ ولهُ الحَمْد، وهُوَ على كُلّ شَيءٍ قَـدير، آيِبـونَ تائِبـونَ عابِـدونَ لِرَبِّـنا حـامِـدون، صَدَقَ اللهُ وَعْـدَه، وَنَصَـرَ عَبْـدَه، وَهَزَمَ الأَحْـزابَ وَحْـدَه.

217. Laa 'ilaaha 'illallaahu wahdahu laa shareeka lahu, lahul-mulku, wa lahul-hamdu, wa Huwa 'alaa kutti shay 'in Qadeer, 'aa'iboona, taa'iboona, 'aabidoona, lirabbinaa haamidoona, sadaqallaahu wa'dahu, wa nasara 'abdahu, wa hazamal-'ahzaaba wahdahu.

None has the right to be worshipped but Allah alone , Who has no partner . His is the dominion and His is the praise , and He is Able to do all things. We return repentant to our Lord, worshipping our Lord , and praising our Lord . He fulfilled His Promise, He aided His slave, and He alone defeated the Confederates.

Reference: Bukhari 7/163, Muslim 2/980. The Prophet (SAW) used to say this when returning from a campaign or from Hajj.