New Delhi, June 18 -- Gasoline prices across the United States have fallen below the $4-per-gallon mark for the first time since March, offering much-needed relief to consumers after months of elevated fuel costs triggered by a major disruption in global energy supplies.

The average price of regular unleaded gasoline nationwide stood at $3.999 per gallon on Thursday, according to data from the American Automobile Association (AAA). The decline follows an interim agreement between the US and Iran aimed at ending the conflict and restoring normal shipping activity through the Strait of Hormuz, a critical route for global oil trade.

Fuel prices have eased considerably from their May highs, when the national average climbed above $4.50 per ...