The two-week ceasefire between the United States and Iran expires today, April 21, with no deal in place and no confirmed extension. Oil prices are surging in response, with WTI crude jumping more than 5% to $88.8 per barrel as traders price in the renewed risk of Strait of Hormuz disruptions.

What the Ceasefire Was — and Why It’s Falling Apart

The ceasefire was agreed on April 8, when Iran reopened the Strait of Hormuz to commercial shipping in exchange for a temporary halt to U.S.-Israeli military operations. The truce was set to last two weeks — giving both sides time to negotiate a more permanent agreement on Iran’s nuclear program and the long-term status of the Strait.

Those talks have collapsed.

U.S. Vice President JD Vance publicly acknowledged over the weekend that the two sides “have not reached an agreement,” citing Iran’s refusal to abandon its nuclear enrichment program as the central sticking point. President Trump, in remarks Monday night, declared the ceasefire “over Wednesday evening Washington time” and called a further extension “highly unlikely.”

Iran’s position hardened simultaneously. Tehran announced it would not send negotiators to Pakistan for a scheduled round of U.S.-Iran talks, citing what it described as “excessive U.S. demands and unrealistic expectations.” The Iranian foreign ministry separately accused the U.S. of violating the ceasefire after U.S. Navy forces seized an Iranian cargo vessel over the weekend.

Oil Market Reaction: Back Above $88

The market reaction has been swift. WTI crude, which had briefly fallen to $84 per barrel after Iran declared the Strait open on April 17, reversed sharply Monday after news broke that talks were faltering.

By Monday close, WTI had surged past $88.8 — a more than 5% single-day gain. Brent crude climbed back toward $94. The moves erased much of the relief rally that followed the initial ceasefire announcement.

Analysts at Goldman Sachs flagged that a full closure of the Strait of Hormuz — through which approximately 21 million barrels of oil pass per day — could push Brent above $120 in the near term, consistent with the spike seen in the first days of the Iran conflict in early April.

What Happens Next

Three scenarios are now in play as the ceasefire expires:

1. Quiet expiry — no immediate military escalation. Both sides let the ceasefire lapse without a formal deal, but neither party restarts active hostilities immediately. Iran reimposes partial restrictions on the Strait but stops short of a full closure. Oil stays elevated but does not spike to extreme levels.

2. Partial deal or informal extension. Pakistan-based mediators broker a last-minute agreement that extends the ceasefire by several days, buying time for further talks. This is widely described as “highly unlikely” by current reporting from CNN and Al Jazeera.

3. Renewed conflict. Iran formally closes the Strait again, triggering a U.S. military response. This is the scenario oil traders are hedging against. Under this scenario, crude could return to the $100–$120 range.

Markets are currently pricing something between scenarios 1 and 2. Iranian negotiators reportedly arrived in Pakistan Tuesday morning, but Tehran has not confirmed their attendance at formal talks.

The Strait of Hormuz: Why It Moves Oil Markets

The Strait of Hormuz is the world’s single most important oil chokepoint. Roughly 20–21 million barrels of crude oil per day — approximately one-fifth of global supply — pass through the 21-mile-wide waterway between Iran and Oman.

When Iran restricted access to the Strait in early April 2026, Brent crude briefly traded above $120. The subsequent ceasefire caused oil’s largest single-day drop since April 2020.

Today’s expiry revives that supply-risk premium.

Key Dates to Watch

  • April 21 (today): Ceasefire officially expires. U.S. military posture in the region expected to shift.
  • April 22: Whether Iran resumes active restrictions on Strait traffic becomes clearer. Oil market direction will depend heavily on maritime incident reports.
  • April 24: If no new hostilities by this date, markets may begin pricing in a de facto informal truce.
  • April 29: Alphabet (Google) reports Q1 earnings — a potential distraction or correlation trade if tech/energy sentiment diverges.

What It Means for Your Portfolio

Energy stocks and oil ETFs will be in sharp focus this week. XOM (ExxonMobil), CVX (Chevron), and crude futures contracts are likely to see elevated volatility.

For investors tracking the broader macro picture, this situation also intersects with Federal Reserve policy. Sustained oil above $90–$95 would reinforce already-stubborn inflation data, reducing the Fed’s flexibility to cut rates before year-end.

The S&P 500 hit all-time highs earlier this month, partly on the assumption that a U.S.-Iran deal would ease geopolitical risk. That assumption is now being directly tested.

Similarly, the IEEPA tariff refund portal that opened April 20 — worth $127 billion in potential corporate refunds — adds another layer of political complexity to this week’s market environment.

Sources: CNN (live updates as of April 20), Al Jazeera, CNBC, NPR, Reuters. This article reports on news as it stands; the situation remains fluid.