The word(s) "travel" appears 24 time(s) in 24 verse(s) in Quran in Muhammad Habib Shakir translation.

(21) And We made between them and the towns which We had blessed (other) towns to be easily seen, and We apportioned the journey therein: travel through them nights and days, secure.

(22) Have they not travelled in the land and seen how was the end of those before them while they were stronger than these in power? And Allah is not such that any thing in the heavens or in the earth should escape Him; surely He is Knowing, Powerful.

(23) Have they not travelled in the earth and seen how was the end of those who were before them? Mightier than these were they in strength-- and in fortifications in the land, but Allah destroyed them for their sins; and there was not for them any defender against Allah.

(24) Surely your Lord knows that you pass in prayer nearly two-thirds of the night, and (sometimes) half of it, and (sometimes) a third of it, and (also) a party of those with you; and Allah measures the night and the day. He knows that you are not able to do it, so He has turned to you (mercifully), therefore read what is easy of the Quran. He knows that there must be among you sick, and others who travel in the land seeking of the bounty of Allah, and others who fight in Allah's way, therefore read as much of it as is easy (to you), and keep up prayer and pay the poor-rate and offer to Allah a goodly gift, and whatever of good you send on beforehand for yourselves, you will find it with Allah; that is best and greatest in reward; and ask forgiveness of Allah; surely Allah is Forgiving, Merciful.