India, June 18 -- Gas prices in the US have fallen below $4 per gallon for the first time in weeks, reaching a national average of $3.99 per gallon on Thursday. The drop is coming just as the busy summer driving season begins, giving Americans some much-needed relief when many families are preparing for vacations and road trips.

Just one month ago, the national average gas price was above $4.50 per gallon during the height of the Iran conflict. Diesel prices were hit even harder during the conflict and climbed above $5.60 per gallon about a month ago, according to AAA data cited by Yahoo Finance. Energy analysts believe gas prices could continue to move lower in the coming weeks because tensions in the Middle East have eased.

Patrick De...