Global oil prices fell sharply on 17 April 2026 after Iranian foreign minister Seyed Abbas Araghchi announced that the Strait of Hormuz was fully open for commercial vessels. Brent crude slid more than 11% to around $88 per barrel, while US West Texas Intermediate plunged 12% to nearly $83. Heating oil futures — a proxy for jet fuel — dropped 13%, and wholesale RBOB gasoline futures fell 7%. US stock indexes opened at fresh all-time highs as traders priced in a reduced risk premium.
What was announced
In a post on X, Araghchi wrote: "In line with the ceasefire in Lebanon, the passage for all commercial vessels through Strait of Hormuz is declared completely open for the remaining period of ceasefire, on the coordinated route as already announced by Ports and Maritime Organisation of the Islamic Rep. of Iran."
Shortly afterwards, President Trump posted that Iran had announced the strait was "fully open and ready for full passage." The announcement coincided with the Paris summit convened by UK Prime Minister Keir Starmer and French President Emmanuel Macron aimed at coordinating a multinational plan to safeguard shipping.
How the prices moved
| Benchmark | Pre-announcement | After announcement | Change |
|---|---|---|---|
| Brent crude | ~$99/bbl | ~$88/bbl | -11% |
| US WTI | ~$94/bbl | ~$83/bbl | -12% |
| Heating oil futures | n/a | n/a | -13% |
| RBOB gasoline | n/a | n/a | -7% |
Source: NBC News, Bloomberg, Axios market data for 17 April 2026.
Context: seven weeks of disruption
The strait has been effectively closed since 28 February 2026, when coordinated US-Israeli airstrikes under Operation Epic Fury hit Iranian military, nuclear and leadership targets, killing Supreme Leader Ali Khamenei. Iran's IRGC responded by forbidding passage through the strait, launched 21 confirmed attacks on merchant ships, and reportedly laid sea mines in the waterway.
The International Energy Agency's April 2026 Oil Market Report described the period as producing "the largest disruption in history" to oil supply. Global oil supply plummeted 10.1 million barrels per day to 97 mb/d in March, with OPEC+ production falling 9.4 mb/d month on month. Physical crude prices reached record levels near $150 per barrel, with middle distillate prices in Singapore exceeding $290/bbl.
The catch: "coordinated routes"
Araghchi's announcement referred to passage "on the coordinated route" announced by Iran's Ports and Maritime Organisation. That language has left ambiguity over whether Iran intends to charge transit tolls — a point the EU's Kaja Kallas has said would "set a dangerous precedent for global maritime routes."
Macron responded that securing the strait needed to be done by "a neutral and independent party." Starmer said the strait "should be reopened immediately with no tolls and no restrictions." Joseph Webster of the Atlantic Council noted that shippers would likely be reluctant to pay tolls to Iran, "especially when the conflict could resume at any time."
What markets are pricing
The sharp move reflects a reduction in the war-risk premium rather than a belief that supply will immediately return to pre-war levels. Key uncertainties remain:
- Whether war-risk insurance cover will be reinstated for Gulf transits, and at what cost
- Whether Iran will enforce a toll or "coordinated route" regime that effectively restricts traffic
- How quickly stranded tankers and disrupted export schedules can normalise
- The durability of the Lebanon ceasefire on which the opening is conditioned
The IEA had modelled a baseline scenario assuming regular Middle East flows resume by mid-year, but warned that this "could prove too optimistic." Research from the Dallas Fed published earlier in April suggested that a one-quarter closure would lift WTI to an average of $110/bbl, with longer closures producing far more severe outcomes.
UK market impact
For UK consumers, the key transmission channel is petrol and diesel prices. The RAC reported that petrol and diesel posted their biggest monthly increases on record in March 2026, and pump prices have risen for a record 43 consecutive days. A sustained oil price easing would take several weeks to fully pass through to forecourts, but the direction is now clearly downward.
For UK businesses, lower energy costs reduce inflationary pressure and give the Bank of England more room on rates. FTSE-listed oil majors fell on the announcement, while broader equities — particularly consumer discretionary, transport and industrials — rallied.
What to watch next
The next 72 hours will test whether the announcement translates into actual transits. Key indicators include AIS transponder activity from tankers in the strait, announcements from major shipping lines on resumption of service, Lloyd's List reporting on war-risk insurance rates, and any statements from Iran or the US on enforcement of the "coordinated route."
Frequently asked questions
The information in this article is for general guidance only and does not constitute financial or investment advice. Market prices move quickly and figures may be outdated by the time you read this. Readers should consult live market data and licensed advisers before making any investment decision.
Will UK petrol prices fall immediately?
There is typically a two-to-four-week lag between wholesale oil price moves and retail pump prices. Supermarket forecourts tend to reflect changes faster than branded stations. The RAC noted that pump prices had nearly stalled already; a sustained oil price fall would tilt them downward.
Is the Lebanon ceasefire holding?
As of 17 April 2026, the ceasefire announced earlier in the month remains in place, though officials have cautioned that it is fragile and conditional. The Hormuz opening is explicitly tied to its duration.
Could oil prices fall further?
Further falls would depend on confirmed resumption of tanker traffic, a durable ceasefire and the unwinding of war-risk insurance premiums. A sustained move back below pre-crisis levels is unlikely in the short term given infrastructure damage and stock drawdowns during the closure.
What happens if Iran enforces tolls?
Transit tolls would effectively raise the cost of oil shipped through the strait and could reignite the dispute. The UK, France and the EU have all publicly rejected any toll regime, and shippers have signalled reluctance to pay.
