Container shipping rates on major east-west trade routes fell to an eighteen-month low this week as congestion eased at several major ports that had struggled with backlogs since last year.

Freight-rate indices tracking the busiest routes showed a decline of more than 15% over the past month, as idle vessel capacity returned to service faster than new cargo volumes could absorb it.

Analysts said the drop should gradually filter through to consumer goods prices over the coming quarter, though the pass-through is rarely immediate or complete.

“Retailers who locked in higher rates on long-term contracts won’t see the benefit right away,” said a shipping analyst at a maritime research firm. “It’s the spot-market shippers who feel this first.”

Currency fluctuations and fuel surcharges continue to complicate the picture for smaller importers, who typically lack the volume to negotiate favourable long-term freight contracts and remain more exposed to short-term rate swings.