Congestion is now playing a bigger role in setting container freight rates, according to Freightos' August 18, 2026 market update — a shift that puts capacity absorption, rather than demand alone, at the center of the pricing picture heading into the peak season.

The update signals that queues and schedule disruption at key gateways are increasingly doing the work that cargo volumes would normally do in a rate cycle: removing effective capacity from the market and giving carriers leverage to hold or push up spot levels.

For shippers, the commercial consequence is straightforward. When congestion rather than demand tightens supply, rate spikes can arrive without the usual warning signs of a booking surge, and the relief that follows a demand-driven spike — softening volumes pulling prices down — may not materialize until the bottlenecks themselves clear.

For carriers, congestion offers a free lever. Vessels waiting outside ports, blanked sailings to recover schedules, and longer turnaround times all shrink effective capacity without carriers having to announce capacity management programs. That supports freight rates of all kinds — spot, short-term contract — even on trade lanes where underlying cargo demand looks flat.

Forwarders face the sharper end of the stick. Congestion-driven volatility is harder to hedge and harder to explain to customers than a demand-driven rally, and it raises the risk of rollovers and rolled bookings at precisely the moment shippers are pressing for schedule reliability in the run-up to peak-season shipments.

The timing matters. An August update landing in the middle of peak-season planning means the congestion effect is arriving when it does the most commercial damage: shippers locking in space and rates for autumn cargo are doing so against a backdrop of tightening effective supply, and any further deterioration in port productivity would feed directly into index levels through September and October.

The mechanics are familiar from previous congestion episodes. When ships queue, they arrive late at their next port call; when they arrive late, lines cascade through the network, forcing carriers to reposition tonnage or blank sailings to recover integrity. Each step removes capacity that the market perceives as available, and each removal narrows the gap between supply and demand that determines spot pricing.

What shippers and forwarders should watch now is whether the congestion described in the update is transient — weather, a short-term spike in volumes, a temporary labor or infrastructure disruption — or structural, the kind of compounding backlog that took months to unwind in previous cycles. Freightos index data will show the answer in the spread between spot and contract rates and in the direction of week-on-week moves on the major east–west trade lanes.

Watch the next updates for whether the congestion effect holds, deepens, or unwinds — the trajectory of effective capacity, not demand, will set the direction of container rates from here.