Gas prices dip below $4 after U.S., Iran reopen Strait of Hormuz
Gasoline slipped below $4 a gallon as a U.S.-Iran deal eased Strait of Hormuz fears, but analysts say freight and pump relief may take weeks.
Drivers got a break at the pump as the national average for regular gasoline dipped to $3.9990 on June 18, crossing below $4 after a sharp run-up tied to conflict and supply fears around the Strait of Hormuz. The slide followed a tentative U.S.-Iran agreement to reopen the waterway, a critical passageway for global oil supplies, and it marked the lowest national reading since mid-April.
The drop has been swift. Reuters said U.S. average retail gasoline prices first fell below $4 a gallon on June 15, while GasBuddy reported a national average of $3.997 a gallon that same Sunday. GasBuddy also said prices fell in 47 states over the previous week, underscoring how broad the easing was after weeks of volatility. Even with the latest decline, gasoline remained about 90.8 cents higher than the same time last year.
The move reflects how quickly geopolitics can hit household budgets. AAA said the national average was still $4.24 on June 4, down 18 cents from the prior week and falling for a second straight week as crude stayed below $100 a barrel. By mid-June, optimism over the U.S.-Iran deal helped push crude lower, and that relief began filtering into retail fuel prices just as summer road-trip season got underway.
The savings, however, may not hold immediately. The Associated Press said it could take weeks or months for oil to fully flow again after reopening the Strait of Hormuz, and damaged infrastructure along with risky transport could keep costs elevated. Bloomberg reported that officials from the two countries were expected to meet in Switzerland on June 19, 2026, to formally sign the agreement, with 60 days of negotiations on Tehran’s nuclear program still ahead. That leaves the arrangement preliminary, even as it has already pushed gasoline lower.
Not every fuel market has eased as quickly. GasBuddy said the median U.S. diesel price was still $4.99 a gallon, down 10 cents from the previous week. That matters for trucking, delivery costs and the freight bills that eventually reach store shelves, suggesting the relief at the pump may arrive faster than the broader price pressures felt by consumer goods.
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