But the international outlook for the world's largest retailer is more mixed, including the uncertainty created by President Donald Trump's aggressive tariff policy.
"The sales environment in the US continues to be positive, while internationally its softer and we're responding appropriately," Walmart chief Doug McMillon said in a statement.
The company's net income jumped more than 92 percent to nearly $3.3 billion in the three months ended October 31 compared to the same quarter a year earlier, the company reported.
Total revenue rose 2.5 percent or $3.1 billion, to $128 billion.
This resulted in adjusted earnings per share, a key US benchmark, of $1.16, well above the median estimate of $1.09 expected by analysts.
The company now projects the full year results to be "up slightly" - a modest improvement over its previous outlook.
US sales rose at Walmart and Sam's Club, despite some impact from reduced tobacco sales, US ecommerce sales surged 41 percent, including a big jump in online grocery sales.
Newly-installed Walmart US President and CEO John Furner said the domestic business "has got a lot of momentum."
The main priority in the short term is to "maintain the momentum through holiday season," he told reporters in a conference call.
