Combining the prayers whilst travelling
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Question: What is best to do whilst travelling: combining the prayers at their earliest (permissible) time (jam’u taqdeem) or combining the prayers at their latest (permissible) time (jam’u ta.kheer)?

Response: That which is best whilst travelling, with respect to combining (the prayers), is to do that which is most easiest for you.

So, if it is easier for you to combine the prayers at their earliest (permissible) time, then do that. And if it is easier for you to combine the prayers at their latest (permissible) time, then do that.

The best is that which is easiest for you to do, whether at the earliest (permissible) time or at the latest (permissible) time – both are legislated for within the Sunnah.

Shaykh Ibn 'Uthaymeen
Liqaa.aat al-Baab al-Maftooh – Volume 1, Page 54, Number 95