A $10.51 Gap Between Brent and WTI (Oil Futures Expiry, 20 October 2026): Why US Crude Touched $110 and Closed at $101.79 — and What the Spread Says About Hormuz

On 20 October 2026, the expiring November WTI contract touched $110.48 and then settled at $101.79. December WTI closed at $98.28 and December Brent at $108.79, which left the global benchmark $10.51 above the US one. Both numbers come from the same disruption. Tankers are under fire in and around the Strait of Hormuz, so oil that is already at sea costs more than oil still in a pipeline in Oklahoma, and a barrel delivered this month costs more than one delivered next month.

What happened on 20 October

Oil had a volatile session that ended lower. Two things were happening on the same day: tanker attacks in the Gulf and the expiry of the front-month US contract.

The fall from the highs came as traders looked for diplomatic progress between the US and Iran, according to CNBC's market report. The attacks did not stop. Iran's Revolutionary Guard said on Tuesday that two "non-compliant" tankers had been set ablaze after hitting mines laid by its naval unit, according to the Iranian state-affiliated agency Tasnim. Over the weekend the Guard had described two tankers carrying about two million barrels each catching fire after hitting mines, Al Jazeera reported.

The headline price fell on the day. The more useful information is in the two spreads, because they show where the shortage is.

Spread one: why Brent sits $10.51 above WTI

Brent and WTI are both light, sweet crude, so their quality is similar. The main difference is location.

• Brent is a waterborne price. It is assessed on cargoes loading in the North Sea, and since 2023 US WTI Midland delivered into Europe has been one of the grades that can set it. A Brent barrel is already on a ship and can sail to whichever refinery is short.
• WTI is an inland price. The futures contract delivers at Cushing, Oklahoma, a pipeline and storage hub hundreds of miles from the sea. To replace a lost Gulf cargo in Asia or Europe, a WTI barrel has to be piped to the Gulf Coast, loaded onto a tanker, insured and shipped.

In normal conditions, the spread is roughly the cost of that journey: pipeline tariffs, port fees, freight and insurance. If the gap grows larger than the journey costs, US exporters buy at Cushing, ship the crude and sell it against Brent, and that buying pulls the two prices back together. This export trade is what normally keeps the spread to a few dollars in calm years.

A war at sea raises the cost of that journey. War-risk insurance rises, fewer tankers are available, and voyages get longer. The loss of Gulf supply shows up first in the price of oil that is already afloat, while inland US crude is supported by its own production and storage. The spread widens until exporting US crude is profitable again at the higher shipping cost.

The freight channel also explains a point PVM Oil Associates analyst Tamas Varga made to CNBC on Tuesday. He said a US decision to exempt Russia's shadow fleet from sanctions could push freight rates lower, which had been holding back demand for US crude, and that "U.S. crude oil grades are back in play as replacements of Mideast crude oil." Cheaper freight makes the export trade cheaper. If more tankers become available, the mechanism points to a narrower spread, with US crude supplying more of the shortfall. That is the direction implied by the mechanism, not a forecast of where either price will go.

Spread two: why November closed $3.51 above December

The second spread is about timing. On its final day, the November WTI contract settled $3.51 above December. When near-dated oil costs more than later-dated oil, the curve is in backwardation.

Backwardation is how a futures curve signals tight inventories. If a refiner needs crude now, a barrel available next month does not help, so the refiner pays extra for the prompt barrel. The same premium affects anyone holding oil in storage. Selling today earns more than holding the barrel to sell next month at a lower price, so stocks get drawn down rather than built up. In this way the curve pulls oil out of storage when the market is short.

Varga said front-end WTI strength ahead of expiry reflected "falling export volumes from the Middle East as tanker attacks and Houthi strikes on Saudi oil infrastructure intensify". He also cited an expected decline in US commercial oil stocks the previous week. That figure comes from the US Energy Information Administration's Weekly Petroleum Status Report, which is normally published on Wednesdays. The report gives both the inventory change and US crude exports, so it is the most direct check on whether the export trade is working.

Why an expiry day swings so far

An $8.69 drop from the session high to the settlement looks extreme for a single day, but the final session of a physically delivered contract has its own mechanics.

A WTI futures contract is a promise to deliver or receive 1,000 barrels at Cushing. Most participants never intend to do either, so they close or roll their positions to the next month before expiry. By the last day, open interest has fallen and the remaining positions belong to traders who must deliver, must take delivery, or must close at any price. Liquidity is thin, and a modest order can move the price a long way. The contract converges on the value of physical crude at Cushing, which is set by whether local tanks are full or empty and whether pipelines to the coast are running full.

That is why front-month prices on expiry day can look disconnected from the rest of the curve. The December contract, which now becomes the benchmark people quote, moved only 26 cents on the day. For a reading of the broader market, December is the better guide. The expiring contract is better read as a snapshot of physical tightness at one location on one day.

The Hormuz numbers behind the move

The spreads reflect a supply disruption that has been unstable for weeks:

• Exports fell, then swung. Kpler data cited by CNBC put Hormuz exports at 8.5 million barrels a day in the week to 7 October, about 40% below pre-war levels. Middle East shipments overall were 15.3 million barrels a day, 10% below pre-war levels.
• Daily flows are erratic. Nearly 20.8 million barrels passed on 8 October and only 2.9 million on 11 October, according to Kpler data reported by Al Jazeera. Erratic flows make it hard for refiners to plan, which raises the value of barrels that are certain to arrive.
• Attacks are frequent. Kpler counted at least 18 vessels under fire in the two weeks to 20 October. The International Maritime Organization reported in early October that at least 24 sailors had died in attacks on 100 commercial ships since the war began in late February.
• Iran's own exports are halted. Kpler said Iran had not loaded crude for export since late August because of the US naval blockade of its ports.

About one-fifth of global oil consumption passed through the strait before the war. Variable flows from that one route are enough to keep the waterborne premium high even on days when prices fall.

What it means for the instruments people trade

Oil. The two spreads show where the pressure is. A narrowing Brent–WTI gap would mean US exports are reaching the shortfall, or that freight is easing. A flattening November–December spread would mean prompt tightness is fading. If both widen, the shortage is getting worse at sea. Our notes on Hurricane Isaias and Gulf refineries and on the G7 reserve release cover the US-side supply story.

Importer currencies. Europe and Japan buy seaborne crude, so their import bills track the higher waterborne price, not WTI. A wide Brent premium is a larger terms-of-trade cost for the euro and the yen than WTI alone would suggest, and it feeds headline inflation through fuel and freight.

The dollar. The US is a net crude exporter whose refiners buy against the cheaper inland benchmark. A wide spread benefits US refining margins and export volumes, while US pump prices still respond to global product markets. For the dollar, the main channel remains inflation and rate expectations.

The Canadian dollar. Most Canadian crude is sold into the US at prices set as a discount to WTI, not to Brent. When Brent leads, Canada's export revenue rises less than the headline oil price suggests. This is a qualification to the usual oil-to-CAD link, and it applies to the loonie specifically because of where its oil is sold.

What to watch next

• The EIA weekly report. US crude inventories and export volumes show whether US barrels are filling the Gulf shortfall. Rising exports with falling stocks would match the backwardated curve.
• The new front month. December WTI is now the benchmark contract. Whether it holds below $100 while Brent stays above $108 shows whether the inland–waterborne split is lasting.
• Freight and insurance. Any increase in tanker supply, including from the sanctions change Varga described, lowers the cost of the export trade and should narrow the spread through the mechanism above.
• Hormuz transits. Daily flow data matter more than any single attack headline. A run of steady high-volume days would erode the waterborne premium. A run of near-zero days would widen it.
• Diplomacy. Talks between the US and Iran are the stated reason prices fell from their highs. A verified agreement on shipping would affect Brent more than WTI, because Brent carries more of the war premium.

For more on how commodity prices feed into currency scores, see how pip theory works.

Educational macro context only — not investment advice.