Oil tanker rerouting is never a neutral decision. Depending on the chokepoint avoided, the cost can range from around $100,000 to more than $850,000 per voyage, excluding additional insurance, security, and commercial delay costs. At 10 knots, every detour becomes an arbitrage between fuel, time, safety, and political exposure.
For Aframax or Suezmax tankers operating at low speed, the logic is clear: the longer the route, the higher the cost of slow steaming. Vessels such as LION 1 and C VIKING illustrate this reality well, as their route choice is not purely geographic but depends on the vessel profile, cargo, age, exposure level, and interception risk.
Calculation assumptions
To build this comparison, the following baseline assumptions are used:
- Average speed: 10 knots
- Average fuel consumption: 24 tonnes/day for an Aframax at reduced speed
- Fuel price: $600/tonne
- Time charter equivalent (TCE) / immobilization cost: $30,000–$45,000/day
- Average cargo value: $40–$60 million, depending on volume and crude price
These assumptions provide a readable framework, even though real costs vary with market conditions, cargo, weather, and regulatory status.
Chokepoint-by-chokepoint comparison
| Chokepoint / Reroute | Estimated Extra Distance | Extra Time at 10 knots | Additional Fuel | Immobilization / TCE | Estimated Total Cost |
|---|---|---|---|---|---|
| Baltic → UK northern bypass (Shetland/Pentland Firth) | 500–600 NM | 2.0–2.5 days | 48–60 t | $60,000–$112,500 | $120,000–$225,000 |
| Suez → Cape of Good Hope | 3,500 NM | 14.5 days | 348 t | $435,000–$652,500 | $650,000–$860,000 |
| Panama → Cape Horn / Magellan | 3,000–3,500 NM | 12.5–14.5 days | 300–348 t | $375,000–$652,500 | $560,000–$860,000 |
| Malacca → Lombok | 650–700 NM | 2.7–2.9 days | 65–70 t | $81,000–$130,500 | $120,000–$175,000 |
| Ormuz → passage under tension | no true reroute | +4–8 hours exposure | 4–8 t | $5,000–$15,000 | + war risk insurance: $300,000–$500,000 |
Interpretation of the Table
The most costly chokepoint to avoid remains Suez, followed by Panama, with total costs that can exceed $800,000 per voyage. In contrast, a Lombok bypass remains relatively modest, even though it adds non-trivial time and bunker constraints. A northern bypass of the UK is less expensive than major inter-oceanic reroutes, but it becomes risky when North Atlantic weather deteriorates.
The Ormuz case is different: there is no true alternative route, so the main cost is the war risk premium, which can by itself exceed the cost of several days of sailing.
Application to LION 1 and C VIKING
Vessels LION 1 (IMO 9384069) and C VIKING (IMO 9261657) can serve as reference points to analyze the real impact of rerouting depending on tanker type, size, and itinerary. On a Baltic–Atlantic route, for example, a vessel comparable to LION 1 bypassing the UK rather than taking the shortest route may absorb an extra cost of around $150,000–$220,000.
For a vessel exposed to political constraints or operating within a shadow fleet logic, as C VIKING may in certain market configurations, the cost of the reroute is not only financial. It becomes an insurance against interception, document checks, or immobilization. In this case, paying an extra $200,000–$500,000 remains rational if the cargo is worth $50 million and detention would result in total loss of the voyage.
The role of speed
At 10 knots, a tanker covers approximately 240 nautical miles per day. This speed is often chosen to reduce fuel consumption, but it increases the cost of every additional day added to the itinerary. A detour of 3,500 nautical miles therefore represents around 14.5 extra days, nearly 350 tonnes of fuel, and more than $400,000 in lost time revenue.
In practice, slow speed acts as a cost multiplier:
- it reduces instantaneous fuel consumption
- but increases exposure time
- it amplifies the impact of port delays
- and makes the vessel more vulnerable to weather and controls
Conclusion
The comparison shows that oil tanker rerouting is both an economic and geopolitical decision. Between $120,000 for a moderate detour and $860,000 for a major reroute, the spread is immense. For vessels like LION 1 and C VIKING, route choice depends less on comfort than on a risk calculation.
In the crude oil trade, the safest route is not always the cheapest, and the cheapest route is never without consequences. The true cost of a chokepoint is not measured only in tolls or distance, but in lost time, exposure, insurance, and maritime sovereignty.
