If you searched for average air freight cost per kg, you need specifics, not brochures. Here they are — and Masar turns them into a working shipment.
The Saudi baseline first: Airport customs clears in hours to one working day with certificates ready. Air cargo lands at Riyadh (RUH), Jeddah (JED) and Dammam (DMM) in 2–5 days door-to-door: China $2–6/kg, Europe $2.5–5, India $1.5–4. Billing uses chargeable weight — the greater of actual and volumetric (cm³ ÷ 6000).
Below ~45 kg couriers usually win; above it classic air freight is cheaper per kilo; at repeat volumes sea takes over.
For average air freight cost per kg, the difference between a smooth shipment and an expensive one is preparation before arrival.
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Indicatively $2–6/kg from China and $2.5–5 from Europe by chargeable weight, door-to-door in 2–5 days.
Riyadh (RUH), Jeddah (JED) and Dammam (DMM) handle nearly all commercial air freight.