NEW YORK — Oil prices dropped back to where they were in the early days of the Iran war, and U.S. stocks raced to another record Friday after Iran said the Strait of Hormuz is open again for commercial tankers carrying crude from the Persian Gulf to customers worldwide.

The S&P 500 leaped 1.2% to an all-time high and closed out a third straight week of big gains, its longest streak since Halloween. A freer flow of oil could take pressure off prices not only for gasoline but also for groceries and all kinds of other products that get moved by vehicles. It could even ultimately help people pay less on credit-card interest and mortgage bills.

The Dow Jones Industrial Average surged as many as 1,100 points before paring its gain to 868, or 1.8%. The Nasdaq composite climbed 1.5%.

The U.S. stock market has jumped more than 12% since hitting a bottom in late March on hopes the United States and Iran can avoid a worst-case scenario for the global economy despite their war. Friday’s reopening of the Strait of Hormuz, which may only be temporary, is the clearest signal yet for optimism, and President Donald Trump said late Thursday that the war “should be ending pretty soon.”

The price for a barrel of benchmark U.S. crude plunged immediately after Iran’s foreign minister, Abbas Araghchi, posted on X that passage for all commercial vessels through the strait “is declared completely open” as a ceasefire appears to be holding in Lebanon. He said it would stay open for the remaining period of the ceasefire, and the price for U.S. oil dropped 9.4% to settle at $82.59 per barrel.

Brent crude, the international standard, fell 9.1% to settle at $90.38 per barrel. To be sure, it remains above its $70 price from before the war, indicating some caution is still embedded in financial markets.

Several times since the war began, optimism on Wall Street has quickly deteriorated into doubt about a possible end to the fighting. That in turn has caused vicious and sudden swings of prices for everything from stocks to bonds to oil.

Minutes after the Iranian foreign minister’s announcement of the Strait of Hormuz’s reopening, Trump said on his social media network that the U.S. Navy’s blockade of Iranian ports remains “in full force” until both sides reach a deal on the war. He, though, also suggested that “should go very quickly in that most of the points are already negotiated” and emphasized it by using all capital letters.

Companies with big fuel bills soared to some of Wall Street’s biggest gains following the easing of oil prices.

United Airlines flew 7.1% higher, and Southwest Airlines climbed 5.1%. A day earlier, the head of the International Energy Agency had said that Europe has “maybe six weeks or so” of remaining jet fuel supplies.

Operators of cruise ships, which guzzle fuel, also steamed higher. Royal Caribbean Group gained 7.3%, and Carnival rose 7%.

Housing and auto-related companies likewise got some relief from the drop in oil prices.