Santorini: Boat tour to Volcano, Hot Springs & Thirasia island

Santorini’s most dramatic sights are not all on the island itself. This half-day boat trip takes you across the caldera to black volcanic rock, warm sulfur springs, and quiet Thirasia, where a simple waterfront lunch can feel far removed from Fira and Oia.

I especially like the small-group boat, which can reach the stops before larger vessels arrive, and the chance to spend time on Thirasia, a peaceful island with traditional houses and tavernas. The main caution is that the volcano walk is unguided, the climb can be tiring in summer heat, and the hot spring swim requires steady swimming.

Key points to know

• The boat carries a maximum of 24 people, giving the trip a more personal feel than a large excursion vessel.
• Nea Kameni requires a moderate volcanic walk, with a separate €5 entrance fee and no guide accompanying you.
• The hot springs are sulfur-rich and warm rather than bath-hot, with deep water near the boat and no easy standing area.
• Thirasia gives you roughly an hour to explore or eat, but delays can shorten this stop.
• The €83 price includes useful extras, such as water, a towel, pool noodles, a restroom, and one glass of local white wine.
• You must budget for the cable car and volcano fee, which are not included in the advertised price.

Why this five-hour Santorini boat trip is worth considering

This outing works because it joins three very different experiences in one morning: a volcanic island walk, a short swim in geothermal water, and free time on a traditional island. You get scenery from the sea, a look at Santorini’s volcanic core, and a quieter taste of local life without committing a full day.

The small-group format matters. With a maximum of 24 people, the boat is smaller than many vessels operating in the caldera. That can help the captain reach Nea Kameni and the springs before the biggest boats arrive. It also makes boarding and moving around easier, though the boat itself may feel compact when everyone is seated.

At $83, the price is fair if you plan to use the included towel, water, pool noodles, restroom, and wine. It is not an all-inclusive day out. You still pay €5 to enter Nea Kameni, €10 each way for the Fira cable car, and whatever you order on Thirasia. Food is not included.

The captain is an important part of the experience. Panagiotis and Manos are specifically praised for being kind, calm, and capable on the water. The company also uses WhatsApp for clear communication before departure, which is useful when you need help finding the meeting point or understanding the cable car connection.

Reaching the Old Harbor below Fira

The trip begins at Santorini’s Old Harbor, also called Fira Port, at 10:15 in the morning. The harbor sits far below Fira’s cliffs, so reaching it is not as simple as walking from the main town.

You can get down by cable car, by the steep stairway, or by traditional donkey transport. The cable car costs €10 each way, so allow €20 for a return trip if you use it. That expense is easy to overlook when comparing tour prices.

The meeting point is Santorini Sea Trips, Anemos, at the Old Port. Keep your phone available for the operator’s messages, and allow time to reach the harbor before departure. The boat returns to the same place at the end.

The Old Harbor itself has waterfront tavernas, shops, and cafes. It is a pleasant place to pause, but the real practical point is this: the tour does not collect you from your hotel or from Fira’s upper streets. You are responsible for getting down to the water and back up afterward.

Sailing across the caldera to Nea Kameni

The first sailing leg takes about 20 minutes. From the water, you get a different view of Santorini’s steep cliffs and white settlements than you would from a road or viewpoint. The crossing can be breezy and choppy, especially in open water, so bring a light jacket or sweatshirt even on a hot day.

Nea Kameni is a small volcanic island made of dark lava rock. The ground feels stark and rough underfoot, and the setting gives you a direct sense of the forces that shaped the Santorini caldera. This is not a polished park or an easy paved attraction. You walk over uneven volcanic terrain toward the crater rim.

You have about 1 hour and 15 minutes here. That sounds generous, but it includes getting off the boat, walking uphill, pausing for views, and returning before departure. Wear sturdy shoes, carry water, and protect yourself from the sun. The August heat can make the climb hard, especially if you are not used to walking on loose, rocky ground.

There is no guided hike. You are free to set your own pace, but you also need to watch your footing and manage your own safety. The €5 entrance fee is separate from the tour price, and you should have cash available.

This stop suits you if you want a close look at volcanic terrain and do not mind a short, exposed walk. It is less suitable if you need flat paths, shade, or a guide explaining the geology at each point. One weakness of the outing is that the captain may not provide much information about the volcano, Thirasia, or the springs. You get the setting, but not necessarily a full spoken tour.

Swimming at Palea Kameni’s sulfur springs

The next stop is Palea Kameni, the smaller island known for geothermal springs. The water contains sulfur, iron, and other volcanic minerals. You leave the boat for a swim in the warm area around the spring, and the crew provides foam pool noodles to help you stay afloat.

Do not expect a hot bath. The water is described as warm, and its temperature can vary. The swim area is also deep, so you need to be a confident swimmer who can keep moving in the water. A child who is not yet comfortable swimming may not be able to enjoy this stop.

The boat usually spends about 30 minutes here. That includes getting people into the water and back aboard, so your actual swim may be much shorter. If departure runs late or boarding takes time, this stop can feel rushed.

The sulfur may stain pale swimwear. Wear a dark swimsuit, and bring a change of clothes if you prefer not to sit in damp clothing for the rest of the trip. A towel is supplied, but it must be returned to the staff, so do not plan to keep it.

The spring stop is best viewed as a quick, unusual swim rather than a long spa session. I like the chance to get into the water beside the volcanic islands, but you should set realistic expectations about the temperature, depth, and limited time.

Thirasia offers a quieter island pause

Thirasia was once connected to Santorini before the major eruption in the 16th century BC. Today, it feels much less developed than Fira or Oia, with winding lanes, Cycladic houses, and a slower waterfront rhythm.

You have about 1 hour and 15 minutes scheduled here. Use it for a short walk through the village of Manolas, a drink, or lunch at one of the traditional tavernas. Food is not included, but this is the best place on the trip to buy a proper meal.

Thirasia is the part of the outing that gives the schedule emotional balance. Nea Kameni is stark and physical. The springs are brief and practical. Thirasia lets you sit down, eat, and see a quieter side of the islands.

Timing is the main issue. The boat depends on everyone returning on time, and delays can reduce your free period. If you want lunch, choose a taverna quickly rather than spending most of the stop wandering first. In one reported case, a delayed arrival left only a short period for ordering food, so punctuality matters on both sides.

The island is also a good reason to bring a little extra cash. You can decide how much to spend, but the tour price does not cover food or drinks there. If your main goal is a long lunch, the time may feel brief. If you want a quick look at a quieter island, it is a valuable addition.

The return sailing and what comes with the boat

After Thirasia, you sail back to Santorini’s Old Harbor. The final ride gives you time to dry off, enjoy the sea air, and look back toward the caldera cliffs.

The boat includes a restroom, one bottle of water, a returnable towel, and one glass of local white wine. The wine is served in a small plastic cup, so this is a modest onboard refreshment rather than a formal tasting. Still, it is a pleasant touch after the walk and swim.

A windbreaker or sweatshirt is worth packing. Even a warm morning can feel cool once the boat is moving, and spray is possible. You should also keep your phone and other valuables protected from water.

The vessel is smaller than many tour boats, which helps create a friendly group atmosphere but limits personal space. The compact size also means you may feel the motion more clearly when the sea is choppy. The captain’s handling matters here, and Panagiotis is specifically praised for his experience and calm manner.

How the timing affects the experience

The advertised duration is about five hours. In practice, the schedule is tight enough that delays can affect the last two stops. Boarding, helping people into the water, and waiting for late arrivals all take time.

A useful way to think about the schedule is:

• About 20 minutes sailing to Nea Kameni
• About 1 hour and 15 minutes on the volcano
• About 30 minutes at the hot springs
• About 1 hour and 15 minutes on Thirasia
• Additional sailing and boarding time between stops

The Old Harbor is both the starting and ending point, so you do not need to arrange a separate return transfer. You do need to plan for the cable car or climb back to Fira after the boat docks.

The operator requires good weather, and the trip can be canceled if conditions are poor or if the minimum number of participants is not reached. You can then choose another date or request a full refund. For your own plans, avoid scheduling a tight airport, ferry, or cruise departure immediately afterward.

Who will get the most from this tour

I would choose this outing if you want several Santorini highlights in one compact trip and enjoy being on the water. It is a good fit for couples, families with confident swimmers, and anyone who wants more than the usual cliffside views.

You will probably enjoy it most if you:

• Like short walks over rough volcanic ground
• Can swim steadily in deep water
• Want free time rather than a fully narrated tour
• Prefer a smaller boat to a large excursion vessel
• Are happy to buy your own lunch on Thirasia
• Can manage stairs, a cable car, or the steep route to the harbor

You may want another option if you need extensive historical explanation, a fully guided volcano walk, a long swim, or a relaxed schedule with plenty of spare time. The tour is active, exposed to sun and wind, and dependent on the punctuality of the whole group.

Practical packing advice for the five-hour trip

Bring a dark swimsuit, sunscreen, a light jacket, sturdy walking shoes, and cash. The cash covers the €5 Nea Kameni entrance fee and can also help with the cable car and Thirasia purchases.

Pack as lightly as possible. You will move between boat, rock, water, and village, and loose bags are awkward on a small vessel. Keep a dry layer in a protected bag because spray and wet swimwear are part of the day.

The included pool noodles are useful at the springs, but they do not replace swimming ability. If you are traveling with a child who is not a strong swimmer, plan for the child to stay on the boat during the water stop.

Most people can take part, and service animals are allowed. The boat is near public transportation, but the access down to the Old Harbor still requires planning.

Should you book the Santorini volcano and Thirasia boat tour?

Book it if you want a small-group caldera outing with three distinct stops and you are comfortable handling the volcano walk and deep-water swim yourself. The combination of Nea Kameni, Palea Kameni, and Thirasia gives you more variety than a simple sunset cruise, and the quiet island stop adds real value to the morning.

At $83, the trip is reasonably priced for the boat, captain, water, towel, restroom, noodles, and wine. Just add the €5 volcano fee, up to €20 for round-trip cable car rides, and your own food.

Skip it if you want a fully guided geology lesson or generous time at every stop. For everyone else, especially people who appreciate capable captains such as Panagiotis or Manos and prefer a smaller boat, this is a practical way to see Santorini from the water and beyond the main island.

Free cancellation is available up to 24 hours before departure. Inside that window, the fare is not refunded, so check the weather and your schedule before the cutoff.

FAQ

How long does the Santorini boat tour last?

The experience lasts approximately five hours, beginning at 10:15 am and ending back at Santorini’s Old Harbor.

Where does the boat tour start and finish?

It starts and ends at Santorini Sea Trips, Anemos, in Santorini’s Old Port below Fira.

Is the volcano hike guided?

No. The walk on Nea Kameni is unguided, so you are responsible for your own pace and safety.

How much does entry to Nea Kameni cost?

The entrance fee is €5 per person and is not included in the tour price.

Is the cable car included?

No. The cable car costs €10 each way and is paid separately.

What is included in the $83 price?

The price includes the boat trip, restroom access, foam pool noodles, free time on Thirasia, one glass of local white wine, one bottle of water, and a returnable towel.

Are food and drinks on Thirasia included?

No. Food is not included, and you pay separately for anything you order on Thirasia.

Do I need to be a strong swimmer?

You need to be comfortable swimming in deep water because the hot springs area does not offer an easy place to stand. The pool noodles provide flotation help, but they do not replace swimming ability.

What happens if the weather is poor?

The experience may be canceled because of bad weather. You will then be offered a different date or experience, or a full refund. You can also cancel for a full refund up to 24 hours before the start time.