Ihram And Niyyat Of Umrah
If the intention is to perform umra first thing one lands in Saudia, then one should enter miqat with ihram already worn. But if the intention is to perform umra but not immediately, then one can have a stay after landing and then wear ihram at the relevant Miqat near to his location of stay. Dr. Irfan Shahzad Sahab ( @Irfan76 ) can also add his scholarly insight into this matter.