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Best months
May to October
Headline trip
Dia island
Departs
Heraklion old harbour
Suits
Families to couples
Typical
A half-day or a sunset
From
€80 pp
FIND YOUR TRIP
Most boats from Heraklion go to the same island, but the day on the water can be very different. Tell us what you are after.
You want the signature trip — a relaxed sail to the island, with time to swim and snorkel in the clear coves.
You will see: Dia island, sheltered coves, snorkel stops
You want a shorter evening on the water, with golden light on the fortress as you sail back in.
You will see: Dia at golden hour, the Koules fortress lit at dusk
You would rather skip the slow sail, reach the island quickly and hop between more of the coves.
You will see: Dia in under half an hour, several quiet coves
You are travelling with children and want a fun, easy day with swimming and lunch on board.
You will see: Swim stops, snorkel gear, lunch and room for kids
BOOK A TRIP
Real boats with local operators, sailing from the old harbour and the coast nearby.
Afternoon catamaran cruise departing Hersonissos Port at 16:30, sailing through Malia Bay and Agios Georgios Bay. Includes a sushi platter, unlimited drinks, SUP boards, snorkeling gear, and a pink flamingo float. Returns at 20:00. Up to 20 guests on a Nautitech 46F catamaran.
Board a Lagoon 450F catamaran at Heraklion Port and cruise to Dia Island, a protected Natura 2000 zone. Swim, snorkel, and use water toys including a sea scooter, kayak, and SUP boards. Price includes a nutritionist-designed Cretan lunch and unlimited open bar for up to 20 guests.
Board a modern catamaran at Hersonissos Port for a 6.5-hour morning cruise to Dia Island. The tour includes a nutritionist-designed breakfast and lunch, unlimited wine and beer, snorkeling, SUP boards, and a fishing gear set. Maximum 20 guests per departure.
Sail from Heraklion Port to Dia Island on a Lagoon 450F catamaran. Spend the afternoon swimming, snorkeling, and using water sports equipment, then sit down to a nutritionist-designed dinner as you sail back into the sunset. Runs approximately 5 hours.
Cruise from Heraklion to Dia Island on a brand-new Fountaine Pajot 41 catamaran with a maximum of 14 guests. Swim and snorkel in protected bays, use SUP boards and fishing gear, then sit down to a gourmet Mediterranean lunch prepared live by an onboard chef.
Board a Fountaine Pajot 41 catamaran at Heraklion Port for a 4-hour afternoon cruise to Dia Island. Swim, snorkel, and paddleboard in the island's bay, then enjoy fresh sushi rolls and unlimited drinks on the sail back as the sun sets over the Cretan Sea.
WHEN TO GO
The season runs roughly May to October. Here is how the weather moves, and what it means for the month you are looking at — the meltemi, the summer north wind, is the thing to plan around.
Right now, in July
Peak summer. Everything runs, but the meltemi builds through the afternoons, so the open crossing can be choppy. Mornings are calmer.
WHERE YOU GO
Each card notes which trip or cove gets you there, and which ones reach further out.
An uninhabited island reserve a few nautical miles north of the harbour — the destination of almost every Heraklion boat trip. From the city it has the low, scaly profile that gave rise to its sea-dragon legend.
↳ Every Dia cruise
The island's westernmost cove and only proper landing point, with a small jetty and a whitewashed chapel. The usual main anchor and swim stop.
↳ Most Dia cruises
A string of calm, south-facing bays — Panagia, Kapari, Agrielia — where the crew anchors out of the north wind to swim and snorkel. Which cove you get depends on the day.
↳ Wind-dependent
Exceptionally clear water over seagrass meadows and coloured rock, with bream, octopus and the occasional passing sea turtle. Snorkel gear is usually provided.
↳ All swim trips
Beneath the channel lie ancient shipwrecks and the squared blocks of a Minoan-era anchorage, surveyed by Jacques Cousteau in the 1970s. The deeper remains are for divers, not casual snorkellers.
↳ Snorkel & dive trips
The reserve shelters the wild Cretan goat and a colony of a few hundred pairs of Eleonora's falcon. Monk seals pass through the surrounding waters. A sighting is a lucky bonus, never a promise.
↳ Seen from the water
The 16th-century Venetian fortress guarding the old harbour mouth. You sail out beneath it, and it glows gold on a sunset return.
↳ Every Heraklion departure
The longer day-trip alternative on the east coast — the former leper-colony island of Spinalonga and the sunken town of Olous — reached by coach to Agios Nikolaos, where the boat boards.
↳ Coach east, boards at Agios Nikolaos
DEPARTURE PORTS
Most trips sail from Heraklion's small old Venetian harbour, beside the Koules fortress — not the big commercial ferry port. A few leave from the resort coast to the east or west. Always check your real meeting point and any transfer time.
The small marina beside the Koules fortress, about a fifteen-minute walk from the centre — not the big commercial ferry port. The main departure point for Dia.
Trips: Dia sailing cruises, sunset cruises, private charters
Resort ports about 25 to 30 kilometres east, a little closer to the island. A common base for family and pirate-boat cruises.
Trips: Pirate-ship family cruises, Dia sailing trips
A small sheltered bay about 20 kilometres west, where light self-drive motorboats explore the nearby coves and coastline.
Trips: Self-drive boats, easy coastal outings
Dia sits only a few nautical miles north of the harbour, so the crossing is short — roughly half an hour on a fast boat, up to an hour under sail.
PLAN YOUR DAY
Everything worth knowing before you book, in a few seconds of skimming.
The signature half-day. A relaxed sail to the island, two to three hours anchored in the coves to swim and snorkel, usually with lunch and drinks on board.
A shorter evening trip, with a swim stop and the return timed for the sun going down behind the fortress.
The fastest way across — under half an hour — and the most flexible, hopping between several quiet coves on a small boat.
Your own skippered boat and your own pace, by motor yacht, sailing yacht or catamaran, priced per boat rather than per person.
The children's favourite, mostly from the resort coast to the east — a BBQ lunch, snorkelling, and pirate games on deck.
Dedicated trips to Dia's clearest reefs, with gear and a guide, for those who want more time below the surface.
Small skippered outings along the Heraklion coast to try local fishing — covered in full on our Heraklion fishing-trips page.
“You sail out of the old harbour beneath a 16th-century Venetian fortress, and half an hour later drop anchor off an uninhabited island reserve — over the same channel where Jacques Cousteau found ancient shipwrecks and a Minoan-era harbour in the 1970s.”
Mornings are the calmest time on the water. The summer meltemi wind builds through the afternoon, so a morning sail is usually the smoother, drier crossing.
Bring a hat, sunscreen and water. There is little shade on the boats and no shops on the island.
Wear or pack water shoes — there are sea urchins in Dia's rocky shallows. Most trips provide snorkel gear and include a meal and drinks.
Many trips offer a hotel transfer for an extra fee. From the farther resorts the pickup can be well over an hour before the boat leaves.
“Heraklion does not have the famous Balos lagoon of the far west. What it has is Dia — one wild, protected island, a short sail past a sea-fortress, with a sunken harbour beneath the water.”
A boat tour from Heraklion is really one island done many ways. We help you pick the trip — and the morning or evening — that fits the day you are actually going to get.
See the tripsQUESTIONS
Almost all of them go to Dia, an uninhabited island reserve a short sail north of the city. Boats anchor in its sheltered southern coves to swim and snorkel in clear water. A longer day-trip alternative on the east coast visits Spinalonga and Mirabello Bay, but that one boards at Agios Nikolaos after a coach transfer.
Most leave from Heraklion's small old Venetian harbour, beside the Koules fortress and about a fifteen-minute walk from the centre — not the large commercial ferry port. Some family and sailing trips leave from the resort coast to the east, around Hersonissos and Gouves, which is a little closer to the island.
It depends on the boat. A fast motorboat or RIB crosses in roughly twenty-five to forty minutes; a traditional sailing boat takes around an hour. Most half-day trips then spend two to three hours anchored at the island.
The season runs from about May to October. June and September are the sweet spot — warm water, calmer seas and fewer crowds — while July and August are the busiest and windiest. Mornings are generally calmer than afternoons whatever the month.
The crossing to Dia is open and exposed, so a strong meltemi wind can make the trip rough or cause it to be cancelled. If the operator cancels for safety, the usual practice is a free reschedule or a refund. Book it early in your stay, so a wind day still leaves time to try again.
Yes. The sailing and catamaran cruises are family-friendly, and there are dedicated pirate-ship trips built around children. Dia's coves are calm and shallow for swimming, but wear water shoes, as there are sea urchins on the rocks. For anyone prone to seasickness, a morning trip is the calmest.
