Oil prices slid to their lowest in more than a week on Monday, Sept. 21, 2026, as investors anticipated potential diplomatic breakthroughs in the U.S.-Iran conflict during the United Nations General Assembly, alongside a partial recovery in Saudi Arabian shipments despite ongoing regional attacks. Brent crude futures and U.S. West Texas Intermediate (WTI) crude both touched their lowest levels since Sept. 10, according to market reports from Reuters.
Market Movements and Price Declines
Brent crude futures fell to US$101.71 a barrel at 0213 GMT, sliding down US$2.16, or 2.08%, following a 0.91% decline in the previous session, according to Reuters. Meanwhile, the WTI October contract dropped US$2.15, or 2.14 per cent, to US$98.15 a barrel, breaking a key psychological support level at US$100 a barrel ahead of its expiry on Tuesday.
“It seems that a degree of risk premium is being removed from oil prices on hopes that a diplomatic path to de-escalate the US-Iran war may arrive this week,” said Tim Waterer, chief market analyst at KCM Trade, in comments reported by Reuters. “Whether that hope proves to be warranted or not is another question. Time will tell.”
Diplomatic Signals and Regional Tensions
The downward pressure on crude stems largely from expectations surrounding high-level diplomacy at the United Nations in New York. Iranian President Masoud Pezeshkian is expected to attend the UN gathering, and U.S. President Donald Trump stated he would be open to meeting with him, despite the two nations exchanging new threats over the weekend. Al Jazeera reported on Saturday that Iran’s security chief, Mohsen Rezaei, stated Tehran has conveyed its conditions to mediators for re-engaging in negotiations to end the conflict.
Despite diplomatic overtures, physical security risks in the Middle East remain elevated. Yemen’s Iran-backed Houthi movement claimed responsibility for Saturday missile and drone attacks targeting sensitive sites in the Saudi capital of Riyadh, as well as an Aramco facility in the Red Sea export hub of Yanbu. In response to the strikes on Saudi infrastructure, China has asked Iran to help rein in the Houthis following an appeal from Saudi Arabia, according to three Iranian sources cited by Reuters.
Saudi Export Shifts and Flow Resilience
The attacks on Saudi Aramco’s East-West pipeline forced the state energy firm to temporarily halt some shipments via Yanbu, prompting a swift operational pivot. Aramco increased exports through the Strait of Hormuz for September and October to compensate for the disruption. Provisional data from analytics firm Kpler indicates that Saudi exports rebounded to over 4 million barrels per day (bpd) in September, recovering from 2.4 million bpd in August, the lowest since at least 2013.
JPMorgan analysts highlighted the resilience of regional supply chains in a Sept. 18 note, pointing out that total Middle East oil flows averaged 17.1 million bpd over the preceding 10 days, sitting just 6.1 million bpd below the 2025 average. Satellite data analyzed by the bank showed that Saudi oil moving through the Strait of Hormuz averaged 2.9 million bpd over a six-day stretch, marking a substantial increase from just 700,000 bpd in August.
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