The Dark Stores Behind Amazon’s 30-Minute Promise. And Why Walmart Doesn’t Need Them.

Two delivery models, one window

Amazon on Tuesday announced the U.S. expansion of Amazon Now, its 30-minute delivery service, into dozens of cities, with plans to reach tens of millions of customers by year-end. According to CNBC, Amazon is expanding the service to new cities including Austin, Denver, Minneapolis, and Phoenix, with broader coverage rolling out across more parts of Seattle, Philadelphia, Dallas, and Atlanta. Prime members pay $3.99 per Amazon Now order, with an additional $1.99 fee on orders below $15. Non-Prime customers pay $13.99 plus a $3.99 small-order fee. Amazon says 30-minute delivery operates 24 hours a day in most markets where the service is live.

CNBC reported that Amazon is using specialized micro-fulfillment centers, often called dark stores, that range from 5,000 to 10,000 square feet and stock thousands of items. The sites sit closer to customers than Amazon’s larger warehouses, which tend to cluster near highways and logistics hubs. Deliveries run through Amazon’s Flex driver network using personal vehicles, with the company saying it remains open to other transportation modes in specific geographies as the service expands. Udit Madan, Amazon’s senior vice president of worldwide operations, said in a statement that the service covers groceries, household essentials, and items like AirPods that customers may need quickly.

Walmart’s answer runs through its stores

Walmart has been pursuing the same delivery-speed outcome on different infrastructure. In its Q4 fiscal 2026 earnings presentation filed February 19, 2026, Walmart reported that it offers store-fulfilled fast delivery to 95% of U.S. households in less than three hours. On Walmart’s Q4 fiscal 2026 earnings call the same day, CFO John David Rainey told analysts that 35% of Walmart U.S. store-fulfilled orders were delivered in under three hours during the quarter.

The sub-30-minute window, the one Amazon is now claiming with its branded service, is not new territory for Walmart. On Walmart’s Q4 fiscal 2026 earnings call, CEO John Furner told analysts that a large number of the company’s orders are now happening in less than half an hour, that Walmart is averaging under an hour on its Express Delivery service when customers choose it, and that total fast delivery under three hours grew 60% year-over-year.

The structural choice each company is making is what makes the comparison interesting. Amazon is using small-format fulfillment locations placed near customers, while its larger warehouses sit farther from population centers. Walmart already has a network of locations near customers: its existing stores. Walmart’s supercenters, neighborhood markets, and other store formats function as the same kind of forward-positioned inventory Amazon is using dark stores to create, with store associates picking orders and Spark drivers handling much of the last-mile fulfillment. The two models start from different unit economics, different geographic coverage maps, and different assortment constraints.

What is new versus what is incremental

For Walmart, Amazon Now’s city-by-city expansion does not change the underlying competitive question. Amazon and Walmart have been pacing each other on delivery speed for years. What changes Tuesday is that Amazon now has a publicly branded 30-minute service in roughly a dozen named U.S. markets, with stated plans to scale it to tens of millions of customers by year-end. The branding and the geography are the news. The capability is something both companies have been building toward.

Where the comparison gets genuinely uncertain is at the cost line. Amazon has not publicly disclosed unit economics for Amazon Now’s dark-store model. On Walmart’s Q4 fiscal 2025 earnings call in February 2025, CFO John David Rainey told analysts that e-commerce economics improved in the quarter, aided by an approximately 20% reduction in U.S. net delivery cost per order. Whether a purpose-built micro-fulfillment network can match the unit economics of a store-fulfilled network running through an already-built retail footprint is the open question that will determine how far each model travels.

Amazon says it will bring Amazon Now to tens of millions of customers in additional cities by the end of the year. Walmart’s fast-delivery network is built on different infrastructure, with its own expansion still underway.

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