Neptune Atlas
Constanta to Alexandria by sea: 993 nautical miles
Constanta to Alexandria by sea is 993 nautical miles (1,839 km) through the Bosphorus and Dardanelles. The distance is the same in both directions, so this is also the distance from Alexandria to Constanta. Ships on this route often carry wheat.
| Route | Nautical miles | Days at sea at | |||
|---|---|---|---|---|---|
| 10 knots | 12 knots | 14 knots | 16 knots | ||
| Through the Bosphorus and Dardanelles | 993 | 4.1 | 3.4 | 3.0 | 2.6 |
Days are time under way at a steady speed. They leave out waiting, time in port and bad weather. The Bosphorus and Dardanelles add about 0.67 days for the transit and the wait.
- Timed strait
- Bosphorus and Dardanelles
- Transit time
- 0.67 days
- Inside emission areas
- 799 nm
- Straight line
- 776 nm
Emission control areas
799 nm of this route, 80 per cent, is inside an emission control area (ECA): Mediterranean Sea, 799 nm. An ECA is a sea area where a ship must burn fuel with no more than 0.10 per cent sulphur, or clean its exhaust. Either costs more than sailing on ordinary fuel.
The two ports
- Constanta, Romania. UN/LOCODE ROCND, at 44.18 N, 28.65 E.
- Alexandria, Egypt (listed as El Iskandariya (Alexandria)). UN/LOCODE EGALY, at 31.31 N, 30.06 E.
A UN/LOCODE is the United Nations code for a port. The straight line above is the great circle, the shortest line over the globe, which crosses land.
How this was worked out
Computed on 13 October 2026 by the sea router behind the Neptune Atlas voyage estimator. It searches a grid of navigable water built from public sea depth data, so the track goes round headlands and through straits. No draft limit was set and no area was avoided. Distance tables differ by a few per cent, because each one picks its own point for a port and its own track through straits. Use it for planning, not in place of a chart.
Open this route in the free calculator Change the speed, set a sea margin or close a canal. No account is needed.
Related routes
Other routes at Alexandria
- New Orleans to Alexandria6,286 nm
- Novorossiysk to Alexandria1,258 nm
Guides that go with this route
- Emission control areas: where they are and what fuel a ship must burn inside them.
- Bunkers and fuel grades: what a ship burns on a passage like this one.
- Laytime and demurrage: the time allowed in port once the ship arrives.