Based on the salary survey done by PlanningEngineer.net website, it was found that Qatar is the best gulf countries in average salary for planning engineers with an average of 2,728 USD per month which equals to 10,104 Qatari Riyals (See figure below)
In the second place in gulf countries for junior planning engineers, Kuwait pays an average salary of 2,094 USD which equals 637 Kuwaiti dinars. This is around 77% of what Qatar Pays. (see photo below)
Saudi Arabia comes in third place for junior planning engineers with an average salary of 2,080 USD which equals 7,704 Suadi Riyals. This is 99.3% of what Kuwait pays for the same position.
The United Arab Emirates comes in 4th Place with a very similar salary to Saudi Arabia (99.7%). The average salary for junior planning engineer in UAE is 2,047 USD per month which equals to 7,681 UAE dirhams.
The 5th place is for Oman with an average salary for junior planning engineer 1,833 USD which equals 705 Riyal Omani. Oman is paying 88.4% of what UAE pay for the same position.
You can find more data in Planning Engineers Interactive salary report: Planning Engineer Average Salary 2018