Walmart has rolled out its 30-minute-or-less delivery service across 33 US markets, giving customers in those areas access to groceries, pharmacy products and household essentials within half an hour of placing an order.

The service draws on a catalogue of more than 100,000 eligible items, covering baby products, electronics, fresh produce, pet food and prescription medication.

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Fulfilment relies on Walmart’s existing store network, with an algorithm determining dispatch based on order size, driver availability and proximity to the nearest location.

During the first quarter of this year, the retailer completed millions of sub-30-minute deliveries spanning more than 19,000 zip codes.

Cities now included in the rollout are Austin, Denver, Houston, St Louis and Tampa, among others.

Shoppers whose address falls within a qualifying zone will see a “Delivery in 30 minutes or less” prompt at the checkout stage.

The expansion forms part of Walmart’s broader Express Delivery proposition.

The retailer has noted a shift in customer behaviour as quicker fulfilment options become available, with demand concentrating around immediate, everyday purchases.

Categories seeing the strongest uptake include batteries, canned goods, coffee pods, cold and flu medication, dog food, and party supplies.

Beyond the 30-minute tier, Walmart also offers one-hour Express delivery, on-demand delivery within approximately three hours, and a scheduled option allowing customers to nominate a preferred delivery window.

Walmart US chief e-commerce officer Tracy Poulliot said: “Customers are looking for faster, easier ways to get what they need in the moments that matter. We have been delivering orders in 30 minutes or less for more than a year, and today 26% of our Express Deliveries are already arriving in that timeframe.”

The announcement follows Walmart’s first-quarter FY27 results, in which the company reported total revenue of $177.75bn.

Net sales rose 7.1% year-on-year to $175.68bn while membership and other income grew 27% to $2.06bn.

On a constant currency basis, total revenue increased 5.9%, with global e-commerce sales up 26% over the same period.