Stand on the waterfront in Heraklion and look north, and you will see a long, low island lying across the horizon. That is Dia — a protected, uninhabited islet a few miles offshore, and the reason almost every boat trip from the city exists. Heraklion is a working port and a capital, not a beach resort, so the sea day here is not about hopping down the coast: it is a run out to Dia’s sheltered bays, where the water is startlingly clear and there is nothing ashore but rock, goats and the odd chapel. This guide lays out the real options — where the boats leave from, what Dia actually is, roughly what each cruise costs, which format to choose and when to go. To compare the day cruises head to head, see the best Heraklion catamaran cruise guide, or read the full Dia Island day trip guide.
Where Heraklion Boat Trips Leave From
Nearly all of them from Heraklion Port, right in the centre of the city, beside the old Venetian harbour and its 16th-century fortress, Rocca a Mare — the Koules that appears on every postcard of the city. You walk to the boat: no long transfer, no rough beach track, which is part of why a Heraklion cruise is such an easy day. Most crews meet guests near the marina at the agreed time, and the sail out past the fortress to Dia takes roughly 45 minutes to an hour, so the island fills the view for most of the crossing. A few Dia cruises also run from Hersonissos to the east, handy if you are staying along that resort strip.
Boats leave Heraklion Port past the Koules fortress — you walk to the boat, no transfer required.
Dia Island: What You Are Sailing To
Dia is the payoff. It is a long, uninhabited island lying east-to-west across the bay, part of the Natura 2000 network and once studied by Jacques Cousteau, who found the remains of a Minoan harbour on the seabed off its shore. There are no roads, no tavernas and no beach bars — just four sheltered bays on the south coast where a boat can anchor out of the wind, wild goats on the slopes above and water so clear you can watch the anchor settle on the sand five metres down. Because the island shields the bays from the northerly wind, Dia often stays swimmable on days when the Heraklion seafront is choppy, which is exactly why the local boats point at it. You reach it only by sea; there is no ferry service and nowhere to stay.
Dia’s south-coast bays are sheltered from the wind — often swimmable when the Heraklion seafront is choppy.
Heraklion faces open sea to the north, and the nearest good swimming coves are all on Dia. There is no chain of beaches to island-hop, so the cruise is a there-and-back run to the island — which is why every operator’s day is built around it.
Types of Heraklion Boat Trip & What They Cost
The destination barely changes — almost every cruise goes to Dia — so the real choice is the format: how long you are on the water, what is cooked, the size of the group and the time of day. The prices below are typical 2026 market ranges per adult and vary by operator, boat and season; use them as a guide, not a quote.
Morning cruise to Dia
The best all-round day: an early start when the sea is glassiest, the most water toys (sea scooter, inflatable slide, kayak, SUP, snorkel gear), and a cooked brunch and lunch with an open bar. Back by mid-afternoon with the evening still free. The pick for families and first-timers.
Afternoon cruise to Dia
The same length and price as the morning, shifted later: a free morning ashore for Knossos or the museum, then Dia for the swim, a Cretan dinner on board and the golden-hour sail home. Afternoon wind can put a little more movement in the sea than the morning.
Sunset cruise to Dia
The cheapest and most romantic option: a late-afternoon sail with prosecco, sushi or finger food and one swim stop, home under the sunset. Lighter on food and swim time than the day cruises — a concentrated evening rather than a full sea day, and best judged as such.
LUXE cruise to Dia
The premium version: the longest day, the smallest group, and a gourmet multi-course lunch cooked on board by a chef. The quietest, most polished way to do Dia, and the pick for a celebration or a proposal.
DanEri’s all-inclusive catamarans sail Heraklion Port to Dia in four formats: morning (5h, adult €125 / child €85), afternoon (5h, €125 / €85), sunset (4h, €90 / €60) and LUXE (6.5h, from €150, max 14). Each includes food cooked on board, an open bar, snorkelling gear and the water toys, with roughly 20 guests. Free cancellation up to 48 hours. The head-to-head ranking is in our best Heraklion catamaran cruise guide, and the format comparison in which Dia Island cruise to book.
Heraklion Boat Trips, as Guests Tell It
Because the island is the same on every cruise, what guests actually write about is the crew and the day. Every quote below is from a verified Tripadvisor review of DanEri’s Heraklion to Dia catamaran cruise.
Matt, visiting from York, booked the day trip and enjoyed it enough to come back the next week for the sunset sailing:
“The boat is beautiful, and the crew could not do more on the day for the guests on board... The boat travelled to the island of Dia where we moored up for a few hours. The crew placed inflatables in the water and there was also the option to snorkel, fish, swim, or paddle board. The crew then cooked a delicious meal whilst we were in the water which was accompanied by unlimited wine, beer, or soft drinks.”
A common surprise is that a windy forecast does not spoil the day, because Dia’s bays are sheltered. Brookie sailed on exactly such a day:
“We went out on a windy day and you would think it wouldn’t be as fun. But nope it was absolutely perfect. The crew is so accommodating. The food is great! Not to mention the crystal clear blue waters you get to swim in... Staff is on point, experienced and they give you some great history on the local lands. It’s a must if you visit Heraklion.”
And, as everywhere in the fleet, guests leave naming the crew — here Marina, George and Yannis — and the lunch cooked on board:
“Special Thank You to the staff (Marina, George and Yannis), you made it extra special for my family’s adventure trip... The food cooked by George was delicious that my youngest ate everything on her plate... and she’s a picky eater. Marina kept us all hydrated.”
The crew, the water toys and the lunch cooked on board — what guests actually write home about.
What’s Included & What to Bring
On an all-inclusive catamaran the day is handled: food cooked on board, an open bar of local wine, beer and soft drinks, snorkelling gear, paddleboards and the water toys, with a professional crew. There are no facilities on Dia — no shop, no toilets ashore, no shade — so everything comes on the boat with you. Bring swimwear, a towel, a hat and high-factor sun cream, and a waterproof pouch for your phone. One honest note that recurs in reviews: on hot, still days the Dia bays can attract wasps for a short while at anchor, so pack any bite remedy you like to have and stay relaxed if a few appear — the crew deal with it every week. A little cash covers extras and a tip for the crew.
Snorkel gear, paddleboards and the water toys come with the day on an all-inclusive catamaran.
Best Time for a Heraklion Boat Trip
Cruises run from roughly late April to October. The sweet spots are June, September and early October — warm water, long days and thinner crowds than the July–August peak. The variable that decides your day on the north coast is wind: Heraklion faces the open Aegean and the summer meltemi can build a chop by afternoon, which is the real reason the morning cruise, on the glassiest sea, is the reliable choice. Dia’s sheltered bays keep most cruises swimmable even on breezier days, but a very windy forecast can shorten the route. Check the month-by-month Crete sea temperature guide before you pick a date.
Mornings are glassiest; the afternoon and sunset cruises trade a little chop for the light on the way home.
Why a Catamaran in Heraklion
The Dia crossing is short but open, and a catamaran makes it the comfortable choice. Two hulls give a wide, stable deck that barely rolls at anchor, a shallow draft that noses into the sheltered bays, and real space — shaded and open — to spread out between swims rather than perch on a rail. It is also what turns a there-and-back run into a proper day out, with room for the water toys, a galley for the cooked lunch and a crew that handles everything. DanEri sails Heraklion Port to Dia in morning, afternoon, sunset and LUXE formats, all all-inclusive. Book a specific sailing on the morning cruise page, or compare them on the Heraklion cruise ranking.
At anchor in a Dia bay, a catamaran’s deck becomes the best seat off Heraklion.